Seanet System - Gemini 620pd - Multibeam Profiling Sonar - Operator Manual 0695-SOM

Seanet System - Gemini 620pd - Multibeam Profiling Sonar - Operator Manual 0695-SOM
0695-SOM-00001, Issue: 03
Gemini Profiling System
Gemini Profiling System
Product Manual
0695-SOM-00001, Issue: 03
1
© Tritech International Ltd.
Gemini Profiling System
© Tritech International Ltd
The copyright in this document is the property of Tritech International Ltd. The document is supplied by Tritech International Ltd on the
understanding that it may not be copied, used, or disclosed to others except as authorised in writing by Tritech International Ltd.
Tritech International Ltd reserves the right to change, modify and update designs and specifications as part of their ongoing product development
programme.
All product names are trademarks of their respective companies.
0695-SOM-00001, Issue: 03
2
© Tritech International Ltd.
Gemini Profiling System
Table of Contents
Help & Support ........................................................................................................ 6
Warning Symbols ..................................................................................................... 7
I. Introduction to the System ................................................................................... 8
1. Introduction .................................................................................................. 9
1.1. General Overview ............................................................................. 9
1.2. Communications ............................................................................... 9
1.3. Using with the Tritech SCU ........................................................... 10
2. Example Survey Setup .............................................................................. 11
3. Integrating with Survey Software .............................................................. 12
II. Gemini Profiler Head ........................................................................................ 13
4. Gemini Profiler Specification .................................................................... 14
4.1. Dimensions (Forward Facing Unit) ................................................ 14
4.2. Dimensions (Downward Facing Unit) ............................................ 14
4.3. Acoustic Properties ......................................................................... 15
4.4. Electrical and Communications ...................................................... 15
4.5. Physical Properties .......................................................................... 15
4.6. Sonar Head Pin-Out Diagrams ....................................................... 16
4.6.1. Burton 5506-1508 (Main Port) ............................................ 16
4.6.2. Burton 5506-1506 (Auxiliary Port) ..................................... 16
4.7. Cable Specification ......................................................................... 17
4.7.1. Ethernet Cable ..................................................................... 17
4.7.2. VDSL Cable ........................................................................ 17
4.7.3. RS232 Cable ........................................................................ 18
4.8. Offsets ............................................................................................. 19
5. Gemini Profiler Installation ....................................................................... 20
5.1. Installing the Sonar Head ............................................................... 20
5.2. Electrical & Communication Notes ................................................ 21
6. Care & Maintenance of the Gemini Profiler ............................................. 23
6.1. After using the sonar ...................................................................... 23
6.2. If storing the sonar for extended periods ........................................ 23
6.3. Regular maintenance ...................................................................... 23
III. Gemini Hub ..................................................................................................... 24
7. Gemini Hub Specification ......................................................................... 25
7.1. Dimensions Gemini Hub ................................................................ 25
7.2. Physical ........................................................................................... 25
7.3. Electrical and Communication ....................................................... 25
7.3.1. PPS and RS232 Connectors ................................................ 26
7.3.2. Ethernet Configuration ........................................................ 26
7.3.3. VDSL Configuration ........................................................... 27
8. Gemini Hub Installation ............................................................................ 28
8.1. Overview ......................................................................................... 28
8.2. Mounting the Hub .......................................................................... 28
8.3. Electrical and Communication ....................................................... 29
9. Care & Maintenance of the Gemini Hub .................................................. 31
IV. Gemini Software .............................................................................................. 32
10. Gemini Software Installation ................................................................... 33
0695-SOM-00001, Issue: 03
3
© Tritech International Ltd.
Gemini Profiling System
10.1. System Requirements ................................................................... 33
10.2. Installing the Gemini Software ..................................................... 33
10.3. Configuring the Gemini Sonar ..................................................... 33
10.3.1. Check the operation of the Gemini sonar .......................... 34
11. Network Configuration ............................................................................ 35
12. Gemini Software Operation ..................................................................... 36
12.1. Getting Ready to Use the Software .............................................. 36
12.2. Keyboard Shortcuts ...................................................................... 36
12.3. Basic Controls on Advanced Screen ............................................ 37
12.3.1. Online Button ..................................................................... 37
12.3.2. Record Button .................................................................... 39
12.3.3. Player Controls .................................................................. 39
12.3.4. Capture Screen ................................................................... 41
12.3.5. Record as .WMV ............................................................... 41
12.3.6. Invert Display (Up/Down) ................................................. 42
12.3.7. Flip Image (Left/Right) ..................................................... 42
12.3.8. Draw Grid .......................................................................... 42
12.3.9. Zoom Button ...................................................................... 42
12.3.10. Log Directory Selector .................................................... 43
12.3.11. Sound Velocity Indicator ................................................. 44
12.3.12. Palette Selector ................................................................ 44
12.3.13. Gain Assist ....................................................................... 44
12.3.14. Gain Control .................................................................... 45
12.3.15. Range Control .................................................................. 45
12.3.16. Indicators .......................................................................... 45
12.3.17. Scan Sector ...................................................................... 46
12.3.18. Measurements .................................................................. 47
12.4. Advanced Controls on Advanced Screen ..................................... 47
12.4.1. Choose and Position the Equipment .................................. 47
12.4.2. Units ................................................................................... 48
12.4.3. Sound Velocity .................................................................. 48
12.4.4. Compression ...................................................................... 49
12.4.5. Inter-ping ............................................................................ 50
12.4.6. Reset to Defaults ............................................................... 50
12.4.7. Gain Settings ...................................................................... 50
12.4.8. Beam Setup ........................................................................ 51
12.4.9. Digitisation ......................................................................... 52
12.4.10. VDSL Settings ................................................................. 53
12.4.11. Modify Device Network Details ...................................... 53
12.4.12. Settings & Display Tabs .................................................. 53
12.5. Serial Data Input ........................................................................... 54
12.5.1. Sensors ............................................................................... 54
12.5.2. Gemini Hub ....................................................................... 54
12.5.3. COM Ports ......................................................................... 56
V. Troubleshooting and Appendices ..................................................................... 58
Troubleshooting .............................................................................................. 59
A. Setting the computer IP address in Windows XP ..................................... 62
B. Setting the computer IP address in Windows 7 ........................................ 64
0695-SOM-00001, Issue: 03
4
© Tritech International Ltd.
Gemini Profiling System
C. Setting the Gemini Device IP Address in Gemini Software ..................... 66
D. Gemini Software String Decode ............................................................... 67
E. Optional Surface Adapters ........................................................................ 68
E.1. Dimensions ..................................................................................... 68
E.2. Ethernet Adapter ............................................................................ 68
E.3. VDSL Adapter ............................................................................... 69
Glossary .................................................................................................................. 70
0695-SOM-00001, Issue: 03
5
© Tritech International Ltd.
Gemini Profiling System
Help & Support
First please read this manual thoroughly (particularly the Troubleshooting section,
if present). If a warranty is applicable, further details can be found in a Warranty
Statement at the end of the manual.
Tritech International Ltd can be contacted as follows:
Mail
Tritech International Ltd
Peregrine Road
Westhill Business Park
Westhill, Aberdeenshire
AB32 6JL, UK
Telephone
++44(0)1224 744 111
Fax
++44(0)1224 741 771
Email
[email protected]
Website
www.tritech.co.uk
Prior to contacting Tritech International Ltd please ensure that the following is
available:
1. The Serial Numbers of the product and any Tritech International Ltd equipment
connected directly or indirectly to it.
2. Software or firmware revision numbers.
3. A clear fault description.
4. Details of any remedial action implemented.
Contamination
If the product has been used in a contaminated or hazardous environment
you must de-contaminate the product and report any hazards prior to
returning the unit for repair. Under no circumstances should a product be
returned that is contaminated with radioactive material.
The name of the organisation which purchased the system is held on record at
Tritech International Ltd and details of new software or hardware packages will be
announced at regular intervals. This manual may not detail every aspect of operation
and for the latest revision of the manual please refer to www.tritech.co.uk
Tritech International Ltd can only undertake to provide software support of systems
loaded with the software in accordance with the instructions given in this manual. It
is the customer's responsibility to ensure the compatibility of any other package they
choose to use.
0695-SOM-00001, Issue: 03
6
© Tritech International Ltd.
Gemini Profiling System
Warning Symbols
Throughout this manual the following symbols may be used where applicable to
denote any particular hazards or areas which should be given special attention:
Note
This symbol highlights anything which would be of particular interest to
the reader or provides extra information outside of the current topic.
Important
When this is shown there is potential to cause harm to the device
due to static discharge. The components should not be handled without
appropriate protection to prevent such a discharge occurring.
Caution
This highlights areas where extra care is needed to ensure that certain
delicate components are not damaged.
Warning
DANGER OF INJURY TO SELF OR OTHERS
Where this symbol is present there is a serious risk of injury or loss of life.
Care should be taken to follow the instructions correctly and also conduct
a separate Risk Assessment prior to commencing work.
0695-SOM-00001, Issue: 03
7
© Tritech International Ltd.
Gemini Profiling System
Part I
Introduction to the System
0695-SOM-00001, Issue: 03
8
© Tritech International Ltd.
Gemini Profiling System
1. Introduction
1.1. General Overview
The Gemini 620pd Profiling sonar is a multibeam echo sounder with a wide field of
view and rapid update rate able to provide quick feedback to the user.
The Gemini Hub is a rack mountable interface capable of driving two sonar heads,
connecting to a network via Ethernet and bringing in sensor data via RS232.
The Gemini Software is a special application which processes the data from Gemini
sonars and is capable of outputting this data across a network to be used within survey
software packages.
A Gemini Profiling System will comprise the Gemini Profiler, Gemini Hub and
Gemini Software. This manual will detail how to set this system up and cover
operation of the Gemini Software. It does not detail how the data from the Gemini
System will be used within the survey software.
1.2. Communications
There are two connection options, 100Mbit·s-1 Ethernet and VDSL. The sonar will
automatically detect which connection is available and switch to that connection (a
different cable is required, see Section 4.7, “Cable Specification”).
The VDSL option allows a single twisted pair to be used for communication to/from
the sonar at high speeds dependent on the length and quality of the cable. The Tritech
International Ltd supplied VDSL Hub takes the two wire VDSL input and bridges it
to Ethernet for simple connection to a PC.
VDSL maximises the data rate by testing the quality of the connection at start up and
adapting the speed accordingly. With VDSL there is a trade off between link speed
and noise immunity. There is a setting in the software that allows optimisation to cope
with the level of noise introduced by other parts of the system. The sonar can cope
with some electrical noise on the link but it may reduce the image transfer rate.
Note
When using an Ethernet connection the Gemini can fully utilise a
100Mbit·s-1 link while returning the sonar data. If it is to share an Ethernet
link with other high bandwidth devices, such as video cameras, it is
recommended that the 100Mbit·s-1 devices share a Gigabit link to the
surface to reduce possible network congestion.
0695-SOM-00001, Issue: 03
9
© Tritech International Ltd.
Introduction
Gemini Profiling System
1.3. Using with the Tritech SCU
The Tritech International Ltd Surface Control Unit (SCU) is a specially designed
rack mountable computer containing embedded software for use with Tritech
International Ltd sonar equipment. The Gemini range require a higher specification
of hardware than other Tritech products so will only work with the later versions of
the SCU from SCUv5 onwards (either Windows XP or Windows 7 versions).
The profiling heads should be connected to the SCU through a Gemini Hub or
Ethernet/VDSL adapter.
If integrating the SCU into a network (as illustrated in Chapter 2, Example Survey
Setup) then depending on the configuration it may necessary to use a SCU with an
additional network interface fitted or use an external network switch.
0695-SOM-00001, Issue: 03
10
© Tritech International Ltd.
Gemini Profiling System
2. Example Survey Setup
Note
Tritech International Ltd are able to supply the Gemini Profilers, Gemini
Hub and a Surface Control Unit (SCU) but all other hardware shown will
be supplied by other manufacturers and is therefore not supported in any
depth within this documentation.
0695-SOM-00001, Issue: 03
11
© Tritech International Ltd.
Gemini Profiling System
3. Integrating with Survey Software
Documentation is available from Tritech International Ltd detailing the steps
necessary to properly integrate the Gemini Profiler system with external survey
packages. For advice please contact Tritech International Ltd providing the details
for the survey package which is being used or alternatively visit www.tritech.co.uk
and download the relevant manuals.
0695-SOM-00001, Issue: 03
12
© Tritech International Ltd.
0695-SOM-00001, Issue: 03
Gemini Profiling System
Part II
Gemini Profiler Head
13
© Tritech International Ltd.
Gemini Profiling System
4. Gemini Profiler Specification
4.1. Dimensions (Forward Facing Unit)
336
318
80
225
Ø140
50
120
Ø145
Not to scale, dimensions in mm.
4.2. Dimensions (Downward Facing Unit)
474
Ø140
456
Ø145
98
170
50
Not to scale, dimensions in mm.
0695-SOM-00001, Issue: 03
14
© Tritech International Ltd.
Gemini Profiler Specification
Gemini Profiling System
4.3. Acoustic Properties
Acoustic Properties
Operating Frequency
620kHz
Number of Channels
96
Angular Resolution
1.0° acoustic, 0.5° effective
Scanning Sector
130°
Number of Beams
256
Vertical Beamwidth
1°
Range
1.5 to 120m
Scan Rate
2-50Hz (inter-ping time dependent)
Range Resolution
10mm (range dependent)
4.4. Electrical and Communications
Electrical and Communications
Power Consumption
37W max (range dependent, head unit only)
Supply Voltage
20 - 75V DC
Data Communications
Ethernet (up to 80m) or VDSL (up to 1000m)
VDSL Cable Length
Maximum length for VDSL and power is 300m, if power is provided
locally (e.g., by the ROV) then maximum cable length for VDSL
communication only is 1000m.
4.5. Physical Properties
Physical Properties
Property
Titanium Body
Weight
14.6kg air, 9.5kg water (forward facing unit)
19kg air, 13kg water (downward facing unit)
Depth Rating
4000m
Materials
Titanium (6 AL-4V)
Finish
Bead blasted
Operating Temperature
-10 to 35°C
Storage Temperature
-20 to 50°C
0695-SOM-00001, Issue: 03
15
© Tritech International Ltd.
Gemini Profiler Specification
Gemini Profiling System
4.6. Sonar Head Pin-Out Diagrams
Note
Pin-out diagrams show pin orientation of the connector face on the sonar
head.
4.6.1. Burton 5506-1508 (Main Port)
Pin
Function
1
Ethernet RX +
2
Ethernet RX -
3
Ethernet TX +
4
DC +
5
VDSL +
6
Ethernet TX -
7
DC Ground (0V)
8
VDSL -
Diagram
5506-1508
4.6.2. Burton 5506-1506 (Auxiliary Port)
Pin
Function
1
RS232 RX
2
RS232 TX
3
DC +
4
DC Ground (0V)
5
RS232/TTL Ground
6
TTL IN
0695-SOM-00001, Issue: 03
16
Diagram
5506-1506
© Tritech International Ltd.
Gemini Profiler Specification
Gemini Profiling System
4.7. Cable Specification
4.7.1. Ethernet Cable
For an Ethernet connection, the supplied cable is described below and should be
terminated with an appropriate connector for the intended application.
Note
Ethernet connection requires a shielded cable (of CAT5e standard) for the
entire cable run (max 80m), lengths of untwisted cable around connectors
must be kept to an absolute minimum. Untwisted lengths will cause poor
or intermittent operation.
This should be connected to the Burton 5506-1508 (Main port) on the sonar head.
Ethernet Cable Specification
Burton 55A1-1508
Cable Colour
& Specification
Function
1
Red UTP#2 (24AWG)
Ethernet RX +
2
White UTP#2 (24AWG)
Ethernet RX -
3
Blue UTP#1 (24AWG)
Ethernet TX +
4
Red (20AWG)
DC +
6
White UTP#1 (24AWG)
Ethernet TX -
7
Black (20AWG)
DC Ground (0V)
Minimum dynamic bend radius 130mm (static 36mm)
4.7.2. VDSL Cable
A VDSL connection requires only one twisted pair from the sonar to the surface
housed within a 4 core shielded cable.
Note
The signal path should have a characteristic impedance of 110Ω (±10Ω)
for the entire cable run for optimal performance.
This should be connected to the Burton 5506-1508 (Main port) on the sonar head.
0695-SOM-00001, Issue: 03
17
© Tritech International Ltd.
Gemini Profiler Specification
Gemini Profiling System
VDSL Cable Specification
Burton 55A1-1508
Cable Colour
& Specification
Function
4
Red (20AWG)
DC +
5
Blue UTP#1 (24AWG)
VDSL +
7
Black (20AWG)
DC Ground (0V)
8
White UTP#1 (24AWG)
VDSL -
Minimum dynamic bend radius 129mm (static 35mm)
4.7.3. RS232 Cable
The Burton 5506-1506 (Auxiliary port) is designed for use as an interface for
auxiliary sensors and is able to provide power and communicate using the RS232
protocol. The cable should be shielded.
RS232 Cable Specification
Burton 55A1-1506
Cable Colour
& Specification
Function
1
Red UTP#2 (24AWG)
RS232 RX
2
White UTP#2 (24AWG)
RS232 TX
3
Red (20AWG)
DC +
4
Black (20AWG)
DC Ground (0V)
5
White UTP#1 (24AWG)
RS232/TTL Ground
6
Blue UTP#1 (24AWG)
TTL In
Minimum dynamic bend radius 130mm (static 36mm)
0695-SOM-00001, Issue: 03
18
© Tritech International Ltd.
Gemini Profiler Specification
Gemini Profiling System
4.8. Offsets
The centre line for any offset measurements is considered to be the middle of the
receive transducer face as shown.
Transmit (TX)
Receive (RX)
Starboard
0°
Port
The view shows the sonar head as it would look from underneath the survey vessel
with the front of the vessel at the top of the page, i.e., the sonar transmitter to the fore
with the port side correctly aligned on the left.
Note
This offset datum applies to both forward and downward facing variants.
0695-SOM-00001, Issue: 03
19
© Tritech International Ltd.
Gemini Profiling System
5. Gemini Profiler Installation
5.1. Installing the Sonar Head
The sonar should be mounted with the transducers facing toward the scene to be
profiled (typically the seabed). The scanning sector is orientated with the arc of the
transmitter and the vertical beamwidth is at right angles to this arc, such that side and
end-on views of the sonar cone are as follows:
For Vessel Installations
The profiling heads can be installed over the side of the survey vessel or within a
moon pool if one is available. Installation within a moon pool will provide a more
stable operating environment but it must be ensured that the sonar path to the seabed
is clear and not obstructed by the vessel hull.
For over the side installation the profiling heads would normally be mounted such that
the connector end-cap is facing the stern and have to be mounted to a rigid mounting
on the side of the vessel.
0695-SOM-00001, Issue: 03
20
© Tritech International Ltd.
Gemini Profiler Installation
Gemini Profiling System
Note
The use of guy lines or flexible fixings is not recommended.
If the fixing mechanism is designed such that the profiling heads can be withdrawn
from the water but left in place on the side of the vessel then consideration should be
given to the installation of a suitable cover to protect the head when not in use. The
head should be clamped securely around the main part of the body tube. Any metallic
clamps should be electrically insulated from the sonar body by either rubber or plastic
strips or mounting brackets of at least 3 mm thickness and extending at least 3 mm
beyond the clamp boundary to reduce any galvanic corrosion effect.
Note
Non-metallic clamps are preferable; if metallic clamps are used they
should be painted or lacquered with at least two or three coatings.
For ROV Installations
The sonar heads should be mounted in the correct orientation along the trim of the
vehicle and it should have an unrestricted view of the seabed.
The head should be clamped securely around the main part of the body tube. Any
metallic clamps should be electrically insulated from the sonar body by either rubber
or plastic strips or mounting brackets of at least 3 mm thickness and extending at least
3 mm beyond the clamp boundary to reduce any galvanic corrosion effect.
Note
Non-metallic clamps are preferable; if metallic clamps are used they
should be painted or lacquered with at least two or three coatings.
5.2. Electrical & Communication Notes
The unit is designed to be operated either by itself or in tandem with another profiler
and both connected to a Gemini Hub unit (full details of the Gemini Hub can be found
within Chapter 8, Gemini Hub Installation).
Note
An optional Ethernet or VDSL adapter and test cable can be supplied for
deck testing, please contact Tritech International Ltd for more details.
0695-SOM-00001, Issue: 03
21
© Tritech International Ltd.
Gemini Profiler Installation
Gemini Profiling System
Connector Maintenance Guidelines
Mating surfaces should be lubricated with 3M Silicone Spray or equivalent, DO
NOT GREASE. Connectors must be lubricated on a regular basis. Lubricate O-rings
with Dow Corning #111 Valve Lubricant or equivalent. Use Dust Caps and keep
connectors clean to prevent damage in storage and service. O-rings can be seriously
degraded if exposed to direct sunlight or high ozone levels for extended periods of
time. Clean plugs and receptacles with soap and fresh water.
Caution
When attaching a connector make sure that both connector and socket are
completely dry. Any water trapped in the connection could result in an
electrical short.
Caution
If the Gemini has two ports then the unused port must have a blanking cap
fitted prior to immersing in water. Failure to do this will cause permanent
damage.
Caution
If using alcohol or IPA to clean out the connector take care that it does not
come into contact with any other part of the sonar. If an O-ring is present
it should be first removed and discarded and the new O-ring only inserted
after the IPA has evaporated.
Ground Fault Monitoring
The power supply within the Gemini includes an electrically isolated DC-DC
converter front-end. There is a small capacitive connection between the isolated
ground and the sonar chassis which should not noticeably affect any impressed
current ground fault indicator (GFI) equipment.
Power
Caution
Never try to make the Gemini work down a long cable by increasing the
PSU output voltage above 75V DC.
0695-SOM-00001, Issue: 03
22
© Tritech International Ltd.
Gemini Profiling System
6. Care & Maintenance of the Gemini Profiler
6.1. After using the sonar
Make sure that after using the sonar head that it is washed down with fresh water
and check the unit for any signs of obvious damage. Pay particular attention to the
transducer head and free any organic matter which has become trapped. Once the unit
is clean; dry thoroughly and place in storage container.
6.2. If storing the sonar for extended periods
Make sure that the sonar is completely dry (if necessary leave to air-dry before
stowing). Pack into storage container along with several pouches of silica gel.
6.3. Regular maintenance
There are no user serviceable parts inside the sonar and it is not necessary to take it
apart for any maintenance tasks. In light usage as long as the unit is washed thoroughly
with clean fresh water after every use and dried before storage no further maintenance
is required. If the unit is in regular use, or submerged routinely for extended periods, it
is advisable to arrange for an annual service to be carried out by Tritech International
Ltd This service will enable the unit to be checked thoroughly or for any worn parts
to be replaced and will enable long-term trouble free operation of the sonar head.
0695-SOM-00001, Issue: 03
23
© Tritech International Ltd.
0695-SOM-00001, Issue: 03
Gemini Profiling System
Part III
Gemini Hub
24
© Tritech International Ltd.
Gemini Profiling System
7. Gemini Hub Specification
7.1. Dimensions Gemini Hub
88
325
356
436
483
Not to scale, dimensions in mm.
7.2. Physical
Weight
6.5kg
Materials
Aluminium and stainless steel
Operating Temperature
5 to 40°C
Storage Temperature
-20 to 50°C
Operating Environment
Indoor use only.
7.3. Electrical and Communication
Power Consumption
120W maximum
BNC PPS Voltage
5V TTL
Supply Voltage
90-264V AC at 47-63 Hz
Main Fuses
4A, 250V 5x20mm glass antisurge
Communication Ports
1 x Gigabit Ethernet (RJ45)
2 x Ethernet or VDSL (Souriau)
8 x Serial RS232 (DE-9)
1 x BNC (for GPS PPS data)
0695-SOM-00001, Issue: 03
25
© Tritech International Ltd.
Gemini Hub Specification
Gemini Profiling System
7.3.1. PPS and RS232 Connectors
PPS data (5V TTL signal) from a GPS device should be fed into the BNC port on the
rear of the Gemini Hub which is marked Time Sync
Data from ancillary sensors should be fed into the DE-9 RS232 ports.
PORT A - H
DE-9 male connector
Pin
RS232
Pin
RS232
1
‡
6
‡
2
RX
7
RTS
3
TX
8
CTS
4
‡
9
‡
5
Ground
‡ = connected for handshaking only.
7.3.2. Ethernet Configuration
In Ethernet configuration the Gemini Hub will have an RJ45 Ethernet port (Port J)
which is for connection to an IT infrastructure. It will also have two Ethernet ports,
as detailed below, which provide power and communications to the Gemini heads.
Pin
Function
A
Ethernet RX +
B
Ethernet RX -
C
Ethernet TX +
D
DC +
E
DC +
F
Ethernet TX -
G
DC Ground
H
DC Ground
J
not connected
K
not connected
L
not connected
M
cable screen
Diagram
Photograph
Souriau UTS71412S
Using cabling provided by Tritech International Ltd it is possible to connect the
Ethernet Port K or Port L into an IT infrastructure also (if for example the Gemini
Sonar is on the other side of a network hub or switch). These cables are designed
such that the power output from the connector is disabled so it is safe to connect into
a router or other network device.
0695-SOM-00001, Issue: 03
26
© Tritech International Ltd.
Gemini Hub Specification
Gemini Profiling System
Note
The data from ancillary sensors connected to the PPS port or RS232 ports
of the Gemini Hub will be output on Port J so it is essential to make
sure that this connection is fed into the computer or network where the
sensor data is to be used. Due to the higher quantity of traffic through this
port a Gigabit link is recommended to ensure sufficient bandwidth.
7.3.3. VDSL Configuration
In VDSL configuration the Gemini Hub will have a single Ethernet port (Port J)
which is for connection to an IT infrastructure. It will also have two VDSL ports
(Port K and Port L), as detailed below, which provide power and communications
to the Gemini heads.
VDSL Cable Length
Maximum length for VDSL and power is 300m, if power is provided
locally (e.g., by the ROV) then maximum cable length for VDSL
communication only is 1000m.
Pin
Function
1
DC Ground
2
DC +
3
not connected
4
VDSL +
5
VDSL -
6
not connected
7
cable screen
0695-SOM-00001, Issue: 03
27
Diagram
Photograph
Souriau UTS7147S
© Tritech International Ltd.
Gemini Profiling System
8. Gemini Hub Installation
8.1. Overview
Warning
The Gemini Hub is intended for INDOOR USE ONLY and should not be
placed in a position where it could get wet.
The Gemini 620pd is designed to be used as part of a survey system and is supplied
with the Gemini Hub unit to enable multiple sensors to be connected through an
Ethernet link to an IT infrastructure.
All status indication is by front panel LEDs which illuminate depending on the
operating conditions.
8.2. Mounting the Hub
The Gemini Hub should be rack-mounted in a suitable frame designed for industrial
computer equipment and fixed in place using the four mounting holes on the front
panel. The handles are to aid insertion into a rack system and are not designed to be
used as a means for carrying the Hub.
Caution
The power lead should be plugged into a suitable location to allow for
access and disconnection at all times to provide a method of cutting power
to the unit and should be labelled to identify it as the disconnecting device.
Warning
This unit requires an earth connection and the power lead must be plugged
into an earthed power socket using a three pin plug.
The rack unit should be adequately ventilated to provide cooling to the system and
the vents should be clear of any obstruction. An internal fan is present within the hub
and care should be taken to ensure the air supply is appropriately dry and filtered.
0695-SOM-00001, Issue: 03
28
© Tritech International Ltd.
Gemini Hub Installation
Gemini Profiling System
8.3. Electrical and Communication
DE-9 Serial Connectors
Ports A to H are for serial devices and work on the RS232 protocol. The
corresponding LED on the front panel (A to H) indicate:
• RED Receiving data.
• GREEN Transmitting data.
• ORANGE Receiving and Transmitting data.
Ethernet and VDSL Connectors
The Ethernet and VDSL ports will be in the same location on the rear of the Hub and
are marked as Port K and L. The Hub will be configured for either Ethernet or VDSL
operation and it is not possible to change between the two.
The connector should be wired according to the pin out specification found in
Chapter 7, Gemini Hub Specification. The Hub can provide power as well as
communications to the sonar head (on both VDSL and Ethernet). If using with an
existing IT infrastructure (i.e. the sonar head is located on the other side of a network
switch) then it will be necessary to construct a cable that does not connect to the
power output. Tritech International Ltd can provide such a cable.
Port J is for connection to an Ethernet infrastructure and it carries data from all of the
connected sensors on the Hub (including data from the DE-9 ports and timestamping
data generated by the signal on the BNC port) and as such it should be connected to
a Gigabit Ethernet connection.
During operation the status of the three ports will be displayed on the front panel of
the Gemini Hub. The top row of LEDs are for Link Status - the LED is red for
receive and green for transmit. The bottom row is for link speed and is as follows:
Port J
RED = 10Mbit·s-1
ORANGE = 100Mbit·s-1
GREEN = 1000Mbit·s-1
Port K & L
Ethernet
RED = 10Mbit·s-1
ORANGE = 100Mbit·s-1
GREEN = 1000Mbit·s-1
Port K & L
VDSL
Shows link speed of internal connection between VDSL and
Ethernet, if dark or erratic this may indicate an internal fault with
the Hub.
0695-SOM-00001, Issue: 03
29
© Tritech International Ltd.
Gemini Hub Installation
Gemini Profiling System
Time Sync Port
The internal clock in the Hub is capable of time-stamping the data provided to the
host computer, however, a much more accurate option is to use an external clock.
The port uses a BNC connector and accepts standard 5V TTL PPS (TransistorTransistor Logic Pulse Per Second) data from a GPS device (the GPS will also have
to be connected to a free RS232 port on the Gemini Hub).
Earth Point (rear panel)
The hub unit is fitted with an earth point on the rear panel.
Caution
This earth point is a functional earth and not a protective earth. For
protective purposes the earth should be connected in the normal way
through the protective earth terminal housed within the IEC power socket.
0695-SOM-00001, Issue: 03
30
© Tritech International Ltd.
Gemini Profiling System
9. Care & Maintenance of the Gemini Hub
There are no user serviceable parts within the Gemini Hub and no maintenance should
be required.
The unit should be operated in a rack mount which is dry, free from excessive dust
and has a good supply of cool air.
Caution
Do not expose the Gemini Hub to moisture.
Warning
Do not remove the cover of the hub unit - doing so may expose the user
to risk of electrical shock
If it becomes necessary to change the main fuse of the unit the following procedure
should be used:
1. Turn off power and remove the power lead from the unit.
2. Locate the fuse holder in between the switch and the power-in socket.
3. Pull out the fuse holder and replace fuses with two of the correct specification (see
Section 7.3, “Electrical and Communication”).
4. Re-insert the fuse holder and ensure it is properly seated.
5. Re-connect the unit and test operation.
0695-SOM-00001, Issue: 03
31
© Tritech International Ltd.
0695-SOM-00001, Issue: 03
Gemini Profiling System
Part IV
Gemini Software
32
© Tritech International Ltd.
Gemini Profiling System
10. Gemini Software Installation
The Gemini Sonar is supplied with software to control the functions of the sonar and
to display the images captured by the unit. The software is supplied as an installer
package which installs the software and a number of supporting files.
10.1. System Requirements
Minimum
Recommended
Processor
2GHz
2GHz dual core
RAM
1GB
2GB
Graphics
3D hardware accelerated graphics card.
Display
1280x1024 (32bit colour)
Disk space
Install is 20MB, greater than 160GB recommended for log files
Networking
100Mbit·s-1 (fast Ethernet)
1000Mbit·s-1 (gigabit Ethernet)
Operating system
Windows XP 32bit
Windows 7 32 or 64bit
1600x1200 (32bit colour)
10.2. Installing the Gemini Software
Note
Always make sure that the latest version of the Gemini software is in use.
The latest version can be downloaded from www.tritech.co.uk
The Gemini software is also supplied with the sonar on a USB memory stick as a
Windows Installer Package (known as an .msi file). Doubling clicking the installation
file will start the Windows Installer and install the software onto the computer. During
installation follow the installer instructions, if required making any appropriate
selections, to install the software.
10.3. Configuring the Gemini Sonar
The Gemini head uses Ethernet to communicate between the head and the computer
running the Gemini software. Depending on the configuration of the system, this may
be partly carried over a VDSL link. Before the head can be connected to the network,
the IP address of the Gemini needs to be set to a suitable value for that network. The
subnet mask needs to be appropriate for the users network and the address chosen.
Configuring the IP address of the Gemini is a four stage process. Firstly the IP address
of the computer is set to a value which will communicate with the Gemini. The
0695-SOM-00001, Issue: 03
33
© Tritech International Ltd.
Gemini Software Installation
Gemini Profiling System
Gemini Software is then used to change the IP address of the Gemini. The third stage
is to reset the IP address of the computer. The final stage is to check the operation
of the Gemini head on the network.
For the correct way to set up the Gemini Profiler network please refer to: Chapter 11,
Network Configuration
For instructions on setting the computer and sonar head IP address please refer to
Appendix A, Setting the computer IP address in Windows XP or Appendix B, Setting
the computer IP address in Windows 7.
10.3.1. Check the operation of the Gemini sonar
If the correct changes have been made to the Gemini Sonar it should now show
as connected in the Gemini Software. If nothing is displayed, check that all values
entered were correct and it may be necessary to rerun the Gemini Software to establish
a link. The Gemini Software retains its settings between runs, and so all the values
which were used whilst the Gemini was programmed will be retained.
When the Gemini Software is started, select the Advanced tab to show details of the
connected Gemini. If the head is able to communicate, it will be listed in the status
window and automatically go online after five seconds.
0695-SOM-00001, Issue: 03
34
© Tritech International Ltd.
Gemini Profiling System
11. Network Configuration
To properly configure the Gemini devices on a network it will be necessary to set the
IP addresses of the devices in the correct order otherwise a situation may arise where
a particular device is unreachable. If a device does become unreachable then it may
be necessary to separate it from the rest of the system to undergo fault finding.
Setup on a complex network
The steps outlined here assume that the network consists only of the
computer running the Gemini software, the Gemini Hub and a single
Gemini Profiler. If the system is more complex it may be necessary to turn
off or disconnect ancillary devices in order to simplify the connection and
configuration process. If two Gemini Profilers are in use then it will be
necessary to connect them one at a time otherwise communication with
them will not be possible because they will both be using the default IP
address.
To set the IP address of the Gemini System devices:
1. Set the IP address of the computer 192.168.2.100 with a subnet mask of
255.255.255.0
2. Change the IP address of the Gemini Profiler from the default value
(192.168.2.201) to the desired value. The status information will remain in
the Gemini Software but it will no longer be possible to communicate with the
Gemini Profiler at this point.
3. Set the IP address of the Gemini Hub from the default value (192.168.2.101)
to the desired value and close the Gemini Software
4. Set the computer to the desired IP address (on the same subnet as previously set
for the Gemini Profiler and Hub)
5. Restart the Gemini Software and both the Hub and Profiler should now be able
to communicate.
Note
For instructions on setting the computer IP address please refer to
Appendix B, Setting the computer IP address in Windows 7 or
Appendix A, Setting the computer IP address in Windows XP.
Note
For instructions on setting the Gemini Hub or Gemini Profiler IP address
please refer to Appendix C, Setting the Gemini Device IP Address in
Gemini Software.
0695-SOM-00001, Issue: 03
35
© Tritech International Ltd.
Gemini Profiling System
12. Gemini Software Operation
12.1. Getting Ready to Use the Software
Before starting, check that the software is running in Profiler mode. The title bar of
the program should read Gemini Profiling Sonar:
If the titlebar is different, then it will be necessary to change the software to operate
in Profiler mode by selecting Profiler from Configuration Options (on
the Advanced screen):
When the Gemini software is running, it presents a choice of two screens, which are
selected by clicking on the tabs at the top left hand of the screen. The two screens are
the User screen and the Advanced screen. The User screen allows the maximum
amount of screen to be used for data display and the Advanced screen enables
adjustment of the sonar settings.
Note
The User screen is not considered separately within this document - the
User screen has a subset of the controls for the Advanced screen with
no added functionality.
Note
To gain access to the online help press the F1 button on the keyboard.
12.2. Keyboard Shortcuts
A number of keyboard shortcuts are available for commonly used activities.
Ctrl f
capture screen to file
F7
toggle logging of data
a
increase gain
z
decrease gain
d
increase range
c
decrease range
g
increase aperture
b
decrease aperture
0695-SOM-00001, Issue: 03
36
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
12.3. Basic Controls on Advanced Screen
The cone in the middle of the display will show the sonar image that the Gemini Sonar
is producing and the digitised points from the strongest returns. Around this display
are the most commonly used controls. The CRP is shown as a small red circle.
On the upper left hand corner are the controls for starting the sonar imaging, starting
the software logging of the images received from the sonar, replaying previously
logged data, and capturing images.
On the upper right hand corner are the controls for arranging the display and selecting
the directory data is to be logged to. The indicator for the sound velocity is also
situated in this area of the screen.
In the middle of the left hand side of the screen is the palette selector.
On the lower left hand side of the screen are the range and gain controls for the sonar.
On the lower right hand side of the sonar display are the indicators showing the pointer
position within the display area.
To the bottom and on the far right are the advanced controls for configuring
the profiling system which are detailed in Section 12.4, “Advanced Controls on
Advanced Screen”.
12.3.1. Online Button
The Online button starts communication with the sonar. When the software is
started the sonar will not be running and the Online button and image (a small
0695-SOM-00001, Issue: 03
37
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
sonar cone) will be grey. Clicking the Online button will start the Gemini Sonar
imaging; the button and the sonar cone image next to it will change to green. Clicking
the button a second time will stop communication with the sonar, and the button and
sonar cone will return to grey.
If the Online button is pressed while no sonars are visible to the Gemini software,
the following message will be displayed.
Clicking OK will acknowledge the message, and the software will not go online.
If the Sonar ID entered in the Sonar box of the configuration settings is not one
of the sonars visible to the Gemini software when the Sonar button is pressed, the
software will present one of two messages.
If only one sonar is visible, the software will offer the chance to start imaging from
that sonar.
Clicking Yes will cause the software to select the sonar which is visible to it. Clicking
No will acknowledge the message, and the software will not change the selected sonar
and will not go online.
If the sonar is not able to connect due to being on a different network or having
different network settings the following will be displayed:
Note
To correctly set up the network refer to Appendix B, Setting the computer
IP address in Windows 7 (or Appendix A, Setting the computer IP address
0695-SOM-00001, Issue: 03
38
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
in Windows XP) and Appendix C, Setting the Gemini Device IP Address
in Gemini Software.
12.3.2. Record Button
The Record Button (a large red dot) controls the recording of the image being
displayed by the software. When the software is started it will not be recording data
and the Record Button will be a dark red dot. When the button is clicked the
software will start recording data and the button will be highlighted. Recording can
be stopped by clicking on the button again.
The Log Directory selector controls which directory the data is recorded in. The
directory displayed in the Log Directory selector is the root directory where all
recorded data will be stored. Below that, a directory will be created using the current
date, and each log data filename will include the time when recording started. For
more details see Section 12.3.10, “Log Directory Selector”.
The software has a maximum file size for the logged data files. Once this size has
been reached, the software will stop logging to the current file and open a new file
to resume logging. The name of the new file will be based on the time the file was
opened. If data is logged for a significant period of time, a number of files will be
created, each with a different filename indicating when the data was first logged to
that file.
For example, if the Log Directory selector is showing that the directory selected
is C:\GeminiData, and recording was started at 4:30:02pm on 18th of October
2014, the data would be recorded in the file 163002_IMG.ECD in the directory C:
\GeminiData\LD20141018.
The software will automatically create any directories needed for recording.
12.3.3. Player Controls
The player controls manage the replay of sonar images previously recorded by the
software.
From left to right they are Play, Stop, Repeat and Open. The controls that are enabled
will depend on what the software is doing, for example, it is not possible to do
anything with the player controls whilst the software is acquiring images from the
Gemini sonar, nor is it possible to open a file whilst another file is already playing.
Play Button
The Play button is a play/pause control for the file player. When the data from a file
is loaded but not playing, the image is a green triangle.
0695-SOM-00001, Issue: 03
39
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
Clicking the image will start the file playing and the image will change to a Pause
control (two vertical lines).
Clicking the image again will pause the file replay and the image will change back
to the Play control (triangle).
Stop Button
The Stop button stops file replay and resets the play progress to the start.
Repeat Button
If the Repeat button is active and the player reaches the end of the file it is playing,
it will return to the start of the file and continue. Clicking the Repeat button will
alternate between the repeat being active and inactive.
Load Button
When the Load button is pressed, the software will open a file selector to allow
the user to select a previously recorded data file to be replayed. To replay the data
recorded at 4:30:02pm on 18th October 2014, file selector would look like this and
the file 163002_IMG.ecd should be selected.
When replaying a log file, the filename, together with the date and time of recording,
will be displayed at the bottom of the screen (below the sonar image) in green text,
for example:
Frame Number and Speed Control
The Frame control is a slider bar which allows the user to move quickly around the
file that has been loaded. The number at the right hand end is the currently displayed
frame number from the file. The slider can be grabbed to move quickly to any position
0695-SOM-00001, Issue: 03
40
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
in the file, whilst the two arrows at the end of the slider can be used to precisely
position the frame being displayed in the file. The frame number can be changed
whilst the file is playing or paused. This control only appears when a file has been
loaded.
The Speed control changes the replay speed of the data being replayed by the
software. The maximum speed is 5 x (500% as indicated by the number at the right
hand end of the slider bar). The slider can be grabbed to change the replay speed
quickly, whilst the two arrows at the end of the slider can used to precisely control the
replay speed. The replay speed can be changed whilst the file is playing or paused.
This control only appears when a file has been loaded.
12.3.4. Capture Screen
The Capture Screen button sits to the right of the player controls and looks
like a camera. When this button is clicked it will take a full screen image of the
Gemini software screen. This image is stored as a JPEG image in the Images subdirectory of the log data directory, with a filename of Gemini_nnnn.jpg, where
nnnn is an incrementing index number for the image. For example using a logging
directory of C:\GeminiData, the first image captured would be stored in the file
C:\GeminiData\Images\Gemini_0001.jpg
When the image has been captured, the Gemini software will display a message (as
below) giving the name of the file. This message will be displayed for five seconds
and then will close automatically.
12.3.5. Record as .WMV
The Record as .WMV button also sits to the right of the player controls and looks
like an old fashioned movie camera on a tripod. WMV capture is only available when
a file is being replayed, WMV capture cannot be performed on live sonar data.
When a file has been loaded and the playback of the file has been paused or stopped,
the WMV capture button will be enabled. When the WMV capture button is clicked,
the WMV capture process will take over the replaying of the data. The WMV capture
process is ended when the WMV capture button is clicked for a second time.
The frame counter will be visible during the WMV capture to allow the selection
of the part of the file to be captured. The WMV will be captured so that the replay
will occur at approximately real time and it is not possible to change the speed of the
playback during capture.
0695-SOM-00001, Issue: 03
41
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
The WMV file that is generated is stored in the Images sub-directory of the
log data directory, with a filename of Gemini_nnnn.wmv, where nnnn is an
incrementing index number for the video. For example using a logging directory
of C:\GeminiData, the first WMV file generated would be stored as C:
\GeminiData\Images\Gemini_0001.wmv
When the WMV file has been captured, the Gemini software will display a message
(as below) giving the name of the file. This message will be displayed for five seconds
and then will close automatically.
12.3.6. Invert Display (Up/Down)
The Invert Display (Up/Down) button, when clicked, inverts the
image displayed by the software.
12.3.7. Flip Image (Left/Right)
If the sonar is mounted upside down, the software has the ability to
flip the image from left to right as viewed on the computer screen
so that the image still appears correctly oriented to the user. The
illustration above shows the button in the non-flipped state.
12.3.8. Draw Grid
The Draw Grid button, when clicked, draws the range and bearing
grid on the image displayed by the software. The illustration above
shows the button in the on state.
12.3.9. Zoom Button
The Zoom button looks like a magnifying glass. When this button
is clicked, a zoom window opens which shows the data around the
mouse pointer in more detail, as the following image shows.
The zoom window positions itself to either the left hand side or the right hand side of
the screen so that it does not obscure the sonar image. The magnification level of the
window is changed by using the mouse wheel, or by using the + and – buttons next
0695-SOM-00001, Issue: 03
42
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
to the zoom button. The magnification level can be changed between 1.5x (minimum
magnification)and 40x (maximum magnification).
Clicking within the sonar arc will lock the zoom at that point. Clicking outside of the
arc will release the lock and the zoomed area will follow the mouse pointer.
12.3.10. Log Directory Selector
The Log Directory selector shows the currently selected directory which will be used
to save data recorded by the software. For a description of how the directories and files
used by the software when recording data refer to Section 12.3.4, “Capture Screen”
and Section 12.3.5, “Record as .WMV”.
When the text below the Log Directory box is clicked (i.e. clicking on C:
\GeminiData on the screen example above) a directory selector to allow the
selection of a directory to be used to log the data to.
0695-SOM-00001, Issue: 03
43
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
12.3.11. Sound Velocity Indicator
The sound velocity indicator at the upper right hand side of the display shows the
sound velocity used by the Gemini Profiler whilst producing the sonar image. The
Gemini Sonar can use a fixed, user-entered, value for the sound velocity or an
externally measured velocity from a Sound Velocity Probe (SVP). The SVP can be
connected through the Gemini Profiler Auxiliary port, any serial port on the Gemini
Hub or any serial port on the host computer.
12.3.12. Palette Selector
The Gemini software is supplied with a number of palettes which are used to show
the different intensities in the sonar image in different colours. The palette bar on the
left hand side of the screen shows the mapping currently being used.
Clicking on the palette bar opens a palette selector which allows the selection of the
palette to use. As the mouse is hovered over the different palettes, the sonar image
will preview that palette.
Note
A contrasting colour scheme should be chosen for the image palette and
targets (see Section 12.4.9, “Digitisation”) in order to be able to see the
digitised points clearly.
12.3.13. Gain Assist
By default this is turned on as indicated by green text. When turned on the Gemini
will automatically reduce a high gain setting on range lines where bright targets are
observed. This improves the clarity of the target, but can give the effect of dark bands
in the background image. When turned off the Gemini will always use the gain slider
setting. If bright targets are observed and a high gain setting is used, the target will
appear to spread out in the displayed image.
0695-SOM-00001, Issue: 03
44
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
12.3.14. Gain Control
The gain slider at the bottom left hand side of the display is used to change the gain
level being used by the Gemini Sonar, and is expressed as a decibel value between
0dB (no gain being applied) and 96dB (full gain being applied).
The gain can be changed by either clicking on the dark blue indicator showing the
current gain position in the slider and dragging it left or right, or by using the arrows
at the end to change the gain one step at a time. The arrows are designed for fine
control of the gain and operate one step per click and clicking on the arrows and
holding them down will have no effect.
The gain can also be altered using keyboard shortcuts ('z' to decrease gain, 'a' to
increase gain).
Note
The gain control is only for the display image and has no effect on the
digisation of targets.
12.3.15. Range Control
The Range slider at the bottom left hand side of the display is used to change to the
range of the image being acquired by the Gemini Sonar.
The range can be changed by either clicking on the dark blue indicator showing the
current range position in the slider and dragging it left or right, or by using the arrows
at the end to change the range one step at a time. The arrows are designed for fine
control of the range and operate one step per click and clicking on the arrows and
holding them down will have no effect. The range control has been implemented with
a logarithmic scale so that the smaller values of range can be more precisely selected.
The range can also be altered using keyboard shortcuts ('c' to decrease range, 'd' to
increase range).
12.3.16. Indicators
0695-SOM-00001, Issue: 03
45
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
When the mouse pointer is within the ‘cone’ on the sonar display (that is over the
displayed sonar image), the indicators at the bottom right hand side of the screen will
show the position of the mouse pointer relative to the origin of the display (that is
relative to the CRP). The pointer position is expressed as a range / bearing pair, and
as a Cartesian co-ordinate (X, Y).
The target intensity local to the point will also be shown.
12.3.17. Scan Sector
Note
If the Spacing is set to Fixed (Low Bandwidth) in Beam Setup
then sector adjustment is not available and the full scan width will be used.
Around the edge of the sonar cone there are three handles that allow the scan sector
(also known as the aperture) to be adjusted. Adjusting the scan sector can be useful if
the area of interest is narrow such as a pipe trench (the beam setup will also require
adjustment, see Section 12.4.8, “Beam Setup”).
Click and hold the mouse over one of the handles. The clicked handle, and any other
handles that will move when the mouse is dragged, will be highlighted. Square shaped
handles adjust the edges of the scan sector. Diamond shaped handles adjust the centre
of the scan sector.
Drag the mouse to move the handle to the desired location and then release the mouse
button. There will be a short delay (depending on network bandwidth) while the sonar
is updated with the new scan sector.
It is possible to adjust the scan sector using the keyboard by pressing 'b' or 'g'.
Note
It is possible to adjust both the left and right sides of the scan sector
symmetrically by holding down the shift key on the keyboard while
moving the handle.
0695-SOM-00001, Issue: 03
46
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
Note
If multiple sonars are in use and the scan sector adjustment handles are
overlapped by another image, the handle underneath can be accessed by
holding down the control key (ctrl) on the keyboard while selecting
the handles. If the control key is not held when the mouse is clicked the
measurement function will be activated instead.
12.3.18. Measurements
When the mouse pointer is within the cone on the sonar display (that is over the
displayed sonar image), measurements can be taken from the display. A single click
on the cone will show the position of the click.
Clicking at one point on the cone and holding the left mouse button down whilst
moving the mouse will give a measurement between the two points.
When any measurement has been taken, clicking outside the cone will turn the
measurement off.
12.4. Advanced Controls on Advanced Screen
The Configuration Options pane is on the far right of the display area and
provides advanced control of the sonar display as well as the data which is to be
output to the 3rd party survey software.
12.4.1. Choose and Position the Equipment
Equipment positions should be given realtive to the vessel CRP which is typically
chosen to be at the vessel Centre of Gravity (COG). This equipment setup will also
need to be entered into the hydrographic survey software package.
0695-SOM-00001, Issue: 03
47
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
The configuration options allow for the selection and configuration of the profiling
heads. Each head that is part of the system can be configured and the first step is to
select the Sonar ID of the head to be altered. Each head can then be positioned
in relation to where it is within the system (i.e. offsets can be input to compensate
for the profiling heads being positioned either side of a vessel) by choosing the
fore/aft (Fwd(m)) and port/starboard (Stbd(m)) offsets. The depth can also be set
(Depth(m)) and the amount of roll for each individual head. If using a motion
reference unit the position of this can be set by inserting values into the MRU row
of the table.
12.4.2. Units
The Units control selects between Metric or Imperial units. These are then applied to
range lines and any measurements which are taken.
Note
The units selection only affects the screen display. Output to the
hydrographic survey package is always in SI units.
12.4.3. Sound Velocity
Note
The Sound Velocity controls are used to set how the Gemini obtains
the sound velocity at the receiver face. This is critical for producing the
sonar image/profile. Incorrect sound velocity cannot be corrected with
post-processing.
The Gemini Profiler can either use a fixed sound velocity (in which case the sound
velocity to be used is entered in the Fixed Value box below the sound velocity
selector), or use a measured sound velocity.
0695-SOM-00001, Issue: 03
48
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
The above example shows the fixed sound velocity selected, and a value of
1499.2m·s-1 will be sent to the Gemini Sonar. The software will round the value
entered and the actual value used will be displayed on the Sound Velocity
display on the User screen.
When using a fixed sound velocity, the software will check the value entered and if it
falls outside the range 1400m·s-1 to 1588m·s-1, it will give a warning to the user and
use a default value of 1499.2m·s-1.
12.4.4. Compression
Run Length Encoding (RLE) is a technique that is used to compress the image data
as it is transferred between the Gemini head and the software, thus reducing the
bandwidth required on the connection between the two. RLE in Gemini is a lossy
compression technique, a level can be applied which means that all data below that
level is set to zero and then the compression is applied. Increasing the RLE level will
increase the efficiency of the compression (and hence reduce the bandwidth required
to transmit the image data) but will remove more and more of the lower levels from
the data (initially reducing the noise but quickly removing smaller objects/weaker
targets from the image).
Enable Compression toggles the compression when clicked (black background
to the button means compression is off, blue background means compression is on).
The Compression control sets the level applied by the run length encoding; this is
the value below which the data is treated as zero rather than the actual data value.
The live image displayed by the Gemini software shows the effect of the compression
immediately.
Note
The compression is applied in the link from the Gemini head to the
software, therefore compression cannot be applied to data that has already
been recorded, and if data has been recorded with compression applied,
the compression cannot be removed from the data.
Note
RLE applies to the image data only and has no effect on the digitised
targets.
0695-SOM-00001, Issue: 03
49
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
12.4.5. Inter-ping
For selectable fixed rate pinging to synchronise ping rate with vessel speed - setting
to a minimum will make the sonar ping at the highest frequency allowable by the
system.
When a Gemini Profiler is online the main display will show an Image and Target
rate.
Green text means that the actual ping rate has achieved the set inter-ping time and
red text means it has not (and is pinging as fast as it is able to). Typically in a survey
a regular ping interval is desired for the targets.
The target rate is not limited by network bandwidth since the target detection
(digitisation) is performed in the sonar head. Network bandwidth only limits the
image transfer rate. The image transfer rate will be reduced if there is insufficient
bandwidth available to send every image to the software, however, every image is
still acquired internally by the sonar and digitised.
12.4.6. Reset to Defaults
The Reset to Defaults button, when pressed, returns the software settings to their
default values.
12.4.7. Gain Settings
0695-SOM-00001, Issue: 03
50
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
Absorption
As sound from the Gemini Profiler transmitter travels through the water, the
amplitude of the received reflected sound pulse reduces over range due to absorption
and spreading losses. The Gemini Profiler compensates for these losses by applying
a time varying gain curve to the received signal such that the measured reflectivity
of a target is not dependent on the range at which the that target is viewed.
The absorption loss coefficient (between 70 and 200 dB km-1), must be set so that the
Gemini Profiler can correctly compensate for the absorption losses. The absorption
loss coefficient will vary depending on the temperature and salinity of the water, and
should be given at the acoustic frequency of 620kHz.
12.4.8. Beam Setup
The Beam Setup options allow control of the sector which is scanned by the Gemini
sonar, this can be useful if the area of interest is quite narrow, such a a pipe trench.
To vary the start and end of the scan sector simply drag the sliders sideways or use
the + and - buttons to increment the values one step at a time. The maximum range
is from -65° to +65°.
The Spacing option allows configuration of the beam spacing:
• Equidistant beams are arranged so that they intersect a flat sea floor at equal
distances apart (more beams at the edges of the image than in the centre).
• Equiangular the beams are spaced with an equal angle between them.
• Inverse Sinusoid is the Gemini default and concentrates more beams in the
centre of the image.
• Fixed (Low Bandwidth) useful only for very low bandwidth systems, will
disable some of the configuration options.
Note
The Scan Sector can also be adjusted using the handles on the scan display,
or using the keyboard shortcuts 'b' and 'g'.
0695-SOM-00001, Issue: 03
51
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
12.4.9. Digitisation
It is possible to configure the display to show the Sonar Image, Targets and
Gates. When the Sonar Image is turned off (when the button is "on" it has
a blue background) and the Targets option selected the display will only show
the digitised return points (i.e., extraneous detections will be filtered out and not
displayed).
If the depth of the terrain to be profiled is known to lie between two ranges then the
range gates can be set and displayed by selecting the Gates button. The gates can
be set either using a Range value or Depth value.
only points enclosed
by the gates are used
Depth Gating
Range Gating
Note
The gates are always in use for target detection (i.e., targets will not
be displayed outside these gates). For targets and gates, the Display
button only affect the displaying of the data, however, to reduce network
bandwidth, the button for Sonar Image enables or inhibits the data
transmission. If the sonar image data is inhibited during logging it will
not be available for playback.
The network data output format will be determined by the survey software which is
running on the network computer and for most cases Tritech will be the correct
choice. If using survey software that does not have a Tritech specific configuration
available then it is possible to emulate a Reson R-Theta or RI-Theta format. For more
details of integration of the Tritech Gemini software with survey applications please
refer to Chapter 3, Integrating with Survey Software.
0695-SOM-00001, Issue: 03
52
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
12.4.10. VDSL Settings
The Gemini software allows three different settings to be applied to the VDSL link,
to cope with different levels of electrical noise experienced by the cable to the sonar.
The VDSL Settings drop-down allows the selection of which settings are to be
applied.
Note
Only if difficulties are being experienced communicating with the Gemini
Sonar should the VDSL settings be changed from Normal Settings
to one of the other values.
12.4.11. Modify Device Network Details
Appendix C, Setting the Gemini Device IP Address in Gemini Software describes in
detail how the Gemini Sonar network details can be altered to allow it to work with
the desired network. Once the sonar has been successfully configured it should not
be necessary to change the settings again unless moving to a different infrastructure.
12.4.12. Settings & Display Tabs
The settings and display tabs are at the bottom of the display window and are for
displaying information about the connected sonar(s) and also for configuration of
external devices, such as the Gemini Hub unit.
Sonars
The first line on the screen gives the versions of the elements which make up
the Gemini software and the other lines show status information from the Gemini
Sonar (or Sonars) connected to the system. More than one Gemini Sonar can be
communicating at any one time and the Gemini software will display the images from
up to a maximum of four of the sonars. With multiple sonars connected the software
can display all sonars and simultaneously output the digitised return points from all
sonars to the survey software.
0695-SOM-00001, Issue: 03
53
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
If more than one Gemini Sonar is connected and powered, its details will appear
on the System Data screen. The currently active sonar will have green text and the
dormant sonar(s) will be in yellow.
For a multiple sonar setup the arrows allow the list of sonars to be scrolled.
12.5. Serial Data Input
12.5.1. Sensors
The Sensors tab is for displaying extra information from connected RS232 sensors.
Note
The Settings field of the Sensors tab is only active if logging is
taking place. Within the Settings field the actions of the operator are
recorded so that during play back of the log file it is possible to see which
settings have been changed.
12.5.2. Gemini Hub
Note
The Gemini software only supports connection to one Gemini Hub.
Hubs Tab
The Hubs tab shows the status information from any connected Gemini Hubs.
0695-SOM-00001, Issue: 03
54
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
Hub Setup Tab
The Hub Setup tab allows configuration of the serial ports on the rear of the Gemini
Hub to allow RS232 data to pass through to the Gemini software from external
sensors.
To enable communication with the Hub click on the Enable Comms button. To
make sure the correct Hub is being used, an ID can be entered by clicking in the Hub
ID text field.
Port
The port letter, corresponding to the label on the back of the
Gemini Hub.
Mode
Can change between an ASCII decode, binary decode or can
echo the data on one of the other ports (ASCII is normal, binary
only used by Simrad EM3000). Echoing the data provides an
alternative option to using a serial splitter cable where a single
data feed is required to be input both to the Gemini system and
to other systems.
Sync
The sync character used to frame the ASCII string.
Baud
The baud rate of the sensor connected to the port.
Decode
The decode definition to apply for the expected receive data on
the port.
Max
Set the time in seconds to generate an alarm if no data is received.
0695-SOM-00001, Issue: 03
55
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
Age
The age of the data, shows when the last good data was received
(see note below).
Hz
The incoming data rate
String
The incoming data string, check this against the chosen Decode
if the data indicator is red.
Pulse-PerSecond (PPS)
Edge
Select Positive edge or Negative edge to match the
signal polarity of the GPS receiver output. If no PPS signal is
connected to the Gemini Hub select <none>.
Time
Synchronisation
Select GPS to use the $GPZDA time strings from the GPS
receiver (this is the normal/default setting). The PC Clock
setting should only be used where a GPS time string is not
available. The PC clock is not sufficiently accurate for use during
a survey and timing errors are likely to be introduced if this
setting is used.
Network data
output
This is only enabled when the Digitisation network data
output format is first set to Tritech (see Section 12.4.9,
“Digitisation”).
The setting controls how RS232 serial data received by the
Gemini Hub is retransmitted over Ethernet to the survey
software. This data can also be disabled if it is not required by
the survey software.
Note
The data age status indicator will show the status of each port. A grey
indicator means no data is present, red is for an incorrect data string,
yellow indicates an incomplete data string and green is for normal
operation.
12.5.3. COM Ports
The Serial Setup tab is where all the ports (both connected to the PC and ports
on the Gemini head) are configured.
The COM ports can be enabled by selecting the Enable Comms button on this tab.
Note
For survey work it is preferable to connect all serial sensors to the Gemini
Hub so that the data can be accurately time stamped. Data received on
COM ports can not be time stamped as accurately which may introduce
timing errors in the survey results.
0695-SOM-00001, Issue: 03
56
© Tritech International Ltd.
Gemini Software Operation
Gemini Profiling System
COM Port
The COM port to use.
...
Open the settings dialog for configuring the port baud rate, data
bits, parity and flow control.
Mode
Can change between an ASCII or binary decode (ASCII is
normal, binary only used by Simrad EM3000).
Sync
The sync character used to frame the ASCII string.
Decode
The decode definition to apply for the expected receive data on
the port.
Max
Set the time in seconds to generate an alarm if no data is received.
Age
The age of the data, shows when the last good data was received
(see note below).
Hz
The incoming data rate
String
The incoming data string, check this against the chosen Decode
if the data indicator is red.
Gemini RS232
Ports
The ports on the rear of any connected Gemini heads. This data
can be decoded as per the computer COM ports or the data can
be routed as an output from one of the computer COM ports (if
the data is required on an second computer, for example).
Note
The data age status indicator will show the status of each port. A grey
indicator means no data is present, red is for an incorrect data string,
yellow indicates an incomplete data string and green is for normal
operation.
0695-SOM-00001, Issue: 03
57
© Tritech International Ltd.
Gemini Profiling System
Part V
Troubleshooting and Appendices
0695-SOM-00001, Issue: 03
58
© Tritech International Ltd.
Gemini Profiling System
Troubleshooting
The software reports that no sonars are detected
VDSL System – Check all cabling between Gemini Hub and the sonar and verify that
the sonar is powered correctly with appropriate voltage at the sonar. If the VDSL
cables are OK and the sonar is operational and the problem will be either the network
connection between Gemini Hub and the PC or the network configuration on the PC.
Note
It may take up to 1 minute to establish a stable VDSL link.
Ethernet System – Check all cabling to the sonar and verify that it is powered correctly
with appropriate voltage at the sonar. Also check that the correct cable is in use for Ethernet systems this needs to be a cable of at least Cat5e standard. If the sonar
has successfully established a link then the problem will be with the network settings
on the PC.
Note
Ethernet connection requires Cat5e cable for the entire cable run (max
80m) – lengths of untwisted cable must be kept to an absolute minimum.
All Systems – Some firewalls have been known to cause this issue. Contact the
network administrator for advice if the sonar is connected to a network where
disabling the firewall would present a security risk.
Note
If a fault with the Gemini Hub is suspected the sonar head should be
connected directly to the computer using an optional Gemini Ethernet/
VDSL adapter and bench test cable. Contact Tritech International Ltd for
more details.
Sonar is present but will not ping
VDSL System – Check the reported link speed – it must be greater than 10Mbit·s-1
downstream to function correctly. If it is less than this then the cable run is either too
long or the VDSL twisted pair is of poor quality.
All Systems – Check your network settings on the PC. Typing route print from
the command line will show the PC routing table. The sonar and PC must be on the
0695-SOM-00001, Issue: 03
59
© Tritech International Ltd.
Troubleshooting
Gemini Profiling System
same subnet and the PC routing table needs to be set up so that packets are routed
correctly to the sonar. If the sonar is receiving ping requests then the IP address of
the PC will appear in the Connected IP Address field in the advanced settings
page of the software.
If the sonar is connected to the PC then the most likely cause is particularly bad packet
loss on the network between sonar and PC.
Note
The sonar will only respond to ping requests from IP addresses on the
same subnet as the sonar. Some firewalls have been known to cause this
issue. To view the computers routing table type route print from the
command line.
Update rate is slow and there are sometimes large gaps
between pings
VDSL System - The VDSL link is susceptible to electrical noise induced by turning
other devices on and off such as thrusters on an ROV. If the link keeps going down
try using the “Medium Noise” or “High Noise” VDSL setting in the advanced option.
Higher Noise settings trade off speed for reliability of the network link. This may
reduce the ping rate slightly but the link will be more reliable in the presence of noise.
Check all connectors on the VDSL twisted pair, poor contacts have been known to
cause this issue.
Ethernet System – There may be noise induced onto the Ethernet cables, be sure to
route these as far away as practicable from noise sources.
All Systems – Some poor quality PC network cards have problems with the large data
rate from the Gemini sonar and drop a significant amount of packets. If you have
large packet loss, try updated network card drivers and a different brand of network
card. Also check that the PC and graphics chipset meet the minimum specification.
Sonar goes offline while operating on deck
The sonar head outputs heat to the body casing (using it as a heatsink) which is
dissipated to the surrounding water during normal operation.
In order to protect the internal electronics from damage due to overheating a thermal
cut-off will shut down the sonar if it gets too warm. It will be necessary to allow the
unit to cool down before it will operate again.
The unit should not be operated out of water for extended periods.
0695-SOM-00001, Issue: 03
60
© Tritech International Ltd.
Troubleshooting
Gemini Profiling System
Gemini software display is choppy or freezes
The most likely cause for this is an inadequate graphics card. This will be especially
evident if using a laptop computer as the main operating PC and it will be
necessary to choose one that has a dedicated graphics chip (the Intel 2000/3000
chips that use part of the main CPU for graphics processing are inadequate). For
desktop computers installation of a dedicated 3D graphics card is recommended
(with optimum results being obtained by using a high resolution screen connected
with a digital interface such as DVI). Additionally, make sure that the rest of the
computer meets other minimum required specifications outlined in Chapter 10,
Gemini Software Installation.
0695-SOM-00001, Issue: 03
61
© Tritech International Ltd.
Gemini Profiling System
Appendix A. Setting the computer IP address in
Windows XP
The following instructions apply to a computer running Windows XP, though the
sequence for other operating systems will be similar.
If the computer is connected to a network already, disconnect it from that network.
From the Start Menu select Control Panel. From the Control Panel Explorer window
that opens, double click on Network Connections. From the list of available network
connections that opens, double click on the Ethernet connection which will be used
to connect to the Gemini Sonar.
Click the Properties button on the dialog which opens. This will open a dialog which
looks like this:
Scrolling the "This connection uses the following items" box will reveal an item titled
"Internet Protocol (TCP/IP)". Click this item to select it, and then press the Properties
button. The following dialog should open:
0695-SOM-00001, Issue: 03
62
© Tritech International Ltd.
Setting the computer IP address in Windows XP
Gemini Profiling System
Make a note of the settings as currently used by the computer; these will be needed
to restore the computer to any existing network. Refer to the appropriate section of
this manual for the correct IP address to use.
The following screenshot shows the dialog after those changes have been made:
0695-SOM-00001, Issue: 03
63
© Tritech International Ltd.
Gemini Profiling System
Appendix B. Setting the computer IP address in
Windows 7
The following instructions apply to a computer running Windows 7, though the
sequence for other operating systems will be similar.
Disconnect the computer from any existing network.
First click on the Start Menu and select Control Panel.
Under Network and Internet click on View network status and
tasks.
This will bring up the Network and Sharing Center which allows
configuration of any networks on the computer. Click on Change adapter
settings on the left-hand pane.
0695-SOM-00001, Issue: 03
64
© Tritech International Ltd.
Setting the computer IP address in Windows 7
Gemini Profiling System
A list of attached network devices should now present itself. Find the one which the
sonar is to be connected to and double-click on it.
The Local Area Connection Properties dialog should be displayed. Find
the entry labelled Internet Protocol Version 4 (TCP/IPv4), select it
and then click on the Properties button.
In the properties dialog which opens there will either be Obtain an IP address
automatically or Use the following IP address selected. If an IP
address is already present, make a note of it before changing any values since it will be
needed if the computer is ever restored to the previous network. Refer to appropriate
section of this manual for the correct IP addresses to use.
0695-SOM-00001, Issue: 03
65
© Tritech International Ltd.
Gemini Profiling System
Appendix C. Setting the Gemini Device IP
Address in Gemini Software
These instructions are applicable to any Gemini device.
For a Sonar
Enter the ID into the Sonar box of the Advanced Configuration
options (upper right hand side of the screen).
For a Hub
Enter the ID into the Hub ID box on the Hub Setup tab.
After starting the Gemini software and
connecting a Gemini device click the
Advanced tab at the upper left hand
side of the screen to show the advanced
settings screen, and expand the Modify
Device Network Details area by
clicking the + button next to it.
Note
The Gemini device should be connected directly to the computer and any
other Gemini devices should be disconnected.
Once the ID of the Gemini has been entered at the top of the screen, the details for
the new IP address can be entered. Three items need to be entered, the Device ID
(to ensure that the correct Gemini is being altered), the new IP Address and the
new Subnet Mask. Once these details have been entered, pressing the Modify
Device Details button will start the process of changing the IP address. A dialog
box will open, requesting confirmation of the change.
Note
If the Gemini is online then it will not be possible to alter the IP address
details. Make sure that the Gemini is offline before trying to change it.
Clicking the Yes button will program the new IP address details into the Gemini.
The new IP address followed by a reboot command will be sent. When the device
reboots it will be using the new IP address, and therefore will not show up on the
status display. Once the IP address of the computer has been changed back to its
original settings the Gemini should once again appear on the status display.
0695-SOM-00001, Issue: 03
66
© Tritech International Ltd.
Gemini Profiling System
Appendix D. Gemini Software String Decode
The Gemini Software is capable of handling input from various different types of
sensors using the following standard strings:
Name
Description
Format/Examples
GPGGA
GPS position
$GPGGA...
GPGGA ZDA
GPS position and UTC time
Digi
Parascientific Digiquartz
(depth sensor)
000.0
HEHDT
Heading
$HEHDT...
OctansAll
Heading, Heave, Pitch,
Roll, Surge, Sway
OctansGHPR
Heading, Heave, Pitch, Roll
OctansHead
Heading
$HEHDT...
OctansHPR
Heave, Pitch, Roll
$PHTRH...
OctansLinear
Heading, Heave, Surge, Sway
OctansPR
Pitch, Roll
$PHTRO...
SonDepth
Depth
$SONDEP...
TSS Std 1
Heave, Pitch, Roll
:000000 -0000H-0000 -0000
Octans Std 2
Heading, Heave, Pitch, Roll
:00000 -0000H-0000 -0000F
AML Smart SVP
Speed of Sound
0 1500.0
Speed of Sound
Speed of Sound
1500.0
Navi-Pack
Position, Heading, Pitch, Roll
$G...
CDL Mini Tilt
Pitch, Roll
P+0000.0R+0000.0
CDL1
Heading, Pitch, Roll
Haaa.aP+ccc.ccR+eee.eeT...
Simard EM3000
Heading, Heave, Pitch, Roll
n/a
$GPGGA...
$GPZDA...
$HEHDT...
$PHTRH...
$PHLIN...
$HEHDT...
$PHTRH...
$HEHDT...
$PHLIN...
Note
With the exception of Simrad EM3000 (which is in binary format)
all of the above strings are in ASCII format and use <CR> as the
synchronisation character.
The above data is a snapshot which may not reflect the current status and
there may be more input options available.
0695-SOM-00001, Issue: 03
67
© Tritech International Ltd.
Gemini Profiling System
Appendix E. Optional Surface Adapters
The Gemini Profiler can optionally be supplied with either a VDSL or Ethernet
adapter to be used with a single Gemini head to allow configuration of the unit.
E.1. Dimensions
160
130
151
70
Not to scale, dimensions in mm.
E.2. Ethernet Adapter
Sonar Head Connector
Pin
Function
A
Ethernet RX+
B
Ethernet RX -
C
Ethernet TX+
D
DC +
E
DC +
F
Ethernet TX -
G
DC Ground
H
DC Ground
J
not connected
K
not connected
L
not connected
M
cable screen
0695-SOM-00001, Issue: 03
68
Diagram
Photograph
Souriau UTS71412S
© Tritech International Ltd.
Optional Surface Adapters
Gemini Profiling System
Ethernet DC Connector
Pin
Function
1
DC Ground
2
DC +
3
not connected
4
not connected
Diagram
Photograph
Souriau UTS7124P
E.3. VDSL Adapter
Sonar Head Connector
Pin
Function
1
DC Ground
2
DC +
3
not connected
4
VDSL +
5
VDSL -
6
not connected
7
cable screen
Diagram
Photograph
Souriau UTS7147S
VDSL DC Connector
Pin
Function
1
DC Ground
2
DC +
3
not connected
4
not connected
0695-SOM-00001, Issue: 03
69
Diagram
Photograph
Souriau UTS7124P
© Tritech International Ltd.
Gemini Profiling System
Glossary
ASCII
American Standard Code for Information Interchange - a
character encoding scheme originally based on the English
alphabet.
AWG
American Wire Gauge
BNC
Bayonet Neill-Concelman - a coaxial signal connector
CAT5e
Category 5 enhanced - a standard specification for Ethernet
cables.
CPU
Central Processing Unit, the processor of a computer.
CRP
Central Reference Point
CTS
Clear To Send (data)
dB
Decibel - a logarithmic unit that indicates the ratio of a physical
quantity, usually power or intensity, predominantly used in
acoustics, electronics and control theory.
DC
Direct Current
DE-9
A 9 pin D shaped connector commonly used for serial
communications on computers.
DVI
Digital Visual Interface, a standard connector for connecting
from a computer to a monitor.
Ethernet
A family of computer networking technologies for local area
networks (LANs).
GB
Gigabyte = 1000MB
Gemini
Unless specified this can refer to any of the multibeam sonars
in the Gemini range by Tritech International Ltd such as the
Gemini Imager (720id), Narrow Beam Imager or Gemini Profiler
(620pd).
Gemini Hub
A rack mountable device capable of driving 2 Gemini sonars and
multiple serial sensors and outputting the data to a PC network.
Gigabit
Measure of transfer speed through Ethernet, usually considered
to be 1000Mbit·s-1
GPS
Global Positioning System.
IEC
International Electro-technical Committee
0695-SOM-00001, Issue: 03
70
© Tritech International Ltd.
Glossary
Gemini Profiling System
IP
Internet Protocol - generally used as a means of addressing
individual computers.
IPA
Isopropyl Alcohol (also known as 2-propanol, isopropanol,
rubbing alcohol and iPrOH).
IT
Information Technology
JPEG or JPG
Joint Photographics Expert Group - a compression method and
file format for image files, files can be stored with either .jpeg
or .jpg file extensions
kB
Kilobyte = 1000 bytes
LED
Light Emitting Diode
MB
Megabyte = 1000kB
Mbit·s-1
Megabit per second - data transfer rate equal to 1000 kilobits per
second.
MRU
Motion Reference Unit
Multibeam
A sonar which forms multiple "beams" of sound so it can update
in real time and does not have to perform a full scan like a
traditional sonar.
PC
Personal Computer
PPS
Pulse Per Second
PSU
Power Supply Unit
RAM
Random Access Memory
RLE
Run-length Encoding - a form of data compression in which
sequences of data that have the same value are stored as a single
datum point and count.
ROV
Remotely Operated Vehicle
RS232
Traditional name for a series of standards for serial binary data
control signals.
RTS
Request To Send (data)
RX
Receive (data)
SCU
Surface Control Unit - a specially manufactured computer which
is rack mountable and capable of processing the data from
the sonar equipment running either Windows XP Embedded or
Windows 7 and Seanet Pro or Gemini software.
0695-SOM-00001, Issue: 03
71
© Tritech International Ltd.
Glossary
Gemini Profiling System
SI
International System of Units - a system of measurement based
on the metric system.
SVP
Sound Velocity Probe
TTL
Transistor Transistor Logic - a signal that can be input to the
Gemini to trigger advanced functions.
TX
Transmit (data)
USB
Universal Serial Bus.
UTC
Coordinated Universal Time (time data closely related to
Greenwich Mean Time (GMT)).
UTP
Unshielded Twisted Pair (cable) is a standard cable wiring
scheme used for communications cable with no cable screen and
no pair shielding (known as Unshielded Unshielded Twisted Pair
(U/UTP) under ISO/IEC 11801).
VDSL
Very-high-bitrate Digital Subscriber Line - a method of
communicating down un-twisted copper cable at uplink speeds
of 18Mbit·s-1 and downlink speeds of 50Mbit·s-1.
WMV
Windows Media Video - a compression format for several
proprietary codecs developed by Microsoft for storing video
files.
0695-SOM-00001, Issue: 03
72
© Tritech International Ltd.
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement