SONARMITE v4.0 BTX/SPX single beam

SONARMITE v4.0 BTX/SPX single beam
SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
SONARMITE v4.0
BTX/SPX single beam
PORTABLE BLUETOOTH ECHO SOUNDER
Ohmex is a company formed to manufacture and distribute products designed by Lymtech Ltd. a company established in 1982 w
founded on technological innovation and design. The company prides itself on being the first to produce products in the field of
instrumentation and software used within the Earth Science sectors. Achievements to date include DGM ,the first digital ground
modelling software to run on a standard PC, SONARLITE, the first truly portable echo sounder, TIDALITE the first portable
Tide Gauge, EDAS, Integrated tide and weather networked software for use by ports and harbours. SONARMITE the first
portable Bluetooth echo sounder based on WinSTRUMENTATION - The integration of Instrumentation, Wireless networks and
modern portable computer equipment.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
INTRODUCTION
The SonarMite Echo Sounder was the result of nearly two years research and
development to further extend the boundaries of shallow water hydrographic
surveying equipment. The introduction by Ohmex of the SonarMite, the worlds first
truly portable echo sounder system, has been a hard act to follow and it remains the
portable instrument of choice in many survey companies around the world. The
release of the SonarMite BTX/SPX instrument marks the next stage introducing a
series of equipment designed around the WinSTRUMENT concept using the latest
portable computers integrated with new measurement technologies.
Throughout the Hydrographic world the term 'Black Box' has become a euphemism
for a device that has a minimal user interface and normally requires connection to a
PC to be of any use ! In most cases these boxes are a cut down version of a more
conventional instrument without all the features of the full system. The SonarMite
extends this idea of a rugged design and minimalist interface to produce a 'Blue Box'
system where the user interface is provided by integrated software running on a
portable computer connected via a Bluetooth link. The use of wireless technology
enables the instrument to be waterproof and used in a hostile environment while the
more sensitive computer features can be located in a more user friendly environment
up to 50m away from the instrument.
Typical SonarMite equipment
The SonarMite BTX/SPX instrument uses the same 'Smart' integrated transducer
technology used in previous systems, in addition to highly reliable bottom tracking
algorithms using DSP techniques the system also outputs a quality value associated
with every depth measurement made. The popular SonarW7 software has been
updated to the latest Windows versions. Software for the 'front end' of the SonarMite
is available to run on a wide range of devices from Pocket PCs through to the full
range of desktop systems running the Windows operating system.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
Typical Use of the Equipment
The SonarMite Portable Echo Sounder has been designed to provide a portable
instrument that provides the facilities of a „professional‟ sounder at the cost and
performance of a „fish finder‟ device. It is important to recognize what the differences
are between these two types of echo sounder. The „fish finder‟ or leisure craft devices
are primarily concerned with two functions, finding fish in the water column below
the boat by sensing returns from their swim bladders and providing a bottom
tracking/smoothing algorithm to detect average water depth below the boats hull.
Survey sounders are designed to provide a large number of pings with as little
processing of the raw data as possible to define the bottom in as fine detail as
possible. Of major concern in a survey sounder is a narrow beam width to prevent
averaging of the returned signal.
235KHz Active Transducers
The SonarMite uses Active Transducers, these are digital as opposed to analogue
components and use microprocessors to synthesize transmitted frequencies and to
interpret the return signals. The devices incorporate state of the art DSP and filtering
techniques to reduce noise and improve depth tracking. These devices are supplied
encapsulated in resin and have no serviceable parts. The connecting cable to the
transducer carries only low DC voltage and digital I/O, none of the EMC problems
associated with conventional analogue sonar devices apply.
To improve weatherproofing and to avoid connection problems the SonarMite has
two connectors that provide all the I/O required by the device. One of the connectors
also includes a return pin to enable the system to switch on by cable connection rather
than using a switch. Cables to the device can be connected simultaneously (e.g.
Transducer on port 1 and Serial Data Cable on Port 2).
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
Equipment Supplied
The SonarMite BTX is supplied as standard with the following list of equipment …

SonarMite main processor unit c/w Bluetooth Antenna

Universal EU/US/UK internal battery charger

„Smart‟ P66 depth transducer c/w 5m cable and embedded processor

Serial data lead

IP68 rugged plastic Transit case

SonarW7 post process/import/export software
SonarMite BTX single beam echo sounder
The following is a short list of accessories for the SonarMite …

SonarMite Windows Mobile PDA software

SonarMite W7 software for Tablet/Portable PC

USB serial data lead

Aluminium shoe to connect transducer to detail pole

Hydrolite frame for small boat mounting
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
The SonarMite SPX is a budget version of the SonarMite supplied as standard
without Bluetooth, internal batteries, charger or IP68 Transit case, the following is a
list of equipment supplied …


SonarMite main processor unit c/w 1.5m 12v battery leads
„Smart‟ P66 depth transducer c/w 5m cable and embedded processor

D9 Serial data lead

SonarW7 post process/import/export software
SonarMite SPX single beam echo sounder
The following is a short list of accessories for the SonarMite …

SonarMite Windows Mobile PDA software

SonarMite W7 software for Tablet/Portable PC

USB serial data lead

Aluminium shoe to connect transducer to detail pole

Hydrolite frame for small boat mounting
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
The SonarMite BTX/SPX is a compact, portable, low power system for use in shallow
water hydrographic surveys, it's small size and low power requirements make the
system easy to deploy and transport to remote or inaccessible sites. The SonarMite
BTX/SPX is a single beam echo sounder providing a wider range of solutions for
surveyors working in shallow water hydrographic surveying. The SonarMite is
available in two versions …
SPX - a single transducer serial data port system with external power
BTX - a single transducer with Bluetooth, serial port & internal batteries
All models make use of a range of interchangeable smart transducers. In its simplest
form the SonarMite SPX and BTX are 235KHz single beam systems in the same
format as the previous SonarMite BT/SP and SonarM8 systems. As with the previous
SonarMite versions every measured depth is accompanied by a QA value which can
be used for post analysis of the survey data.
INSTALLATION & USE
This chapter describes how the SonarMite Portable Echo Sounder would normally be
installed and used. The typical way in which the device can be used for hydrographic
surveying applications, is as a „Dumb‟ sounder connected via a serial cable/Bluetooth
Link to a PC or PDA running data logging and display software. Another option is to
use both data streams with the serial output data for real time processing and the
parallel Bluetooth output for graphic depth display.
Switching the System On
To turn the system on the user ensures the system is fully charged then connect the
transducer to the „Txr‟ connector on the front panel, the LED alongside the Bluetooth
antenna will then turn on.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
Data Collection Techniques
When not used as a „Dumb‟ echo sounder in conjunction with a data logging package
the SonarMite can be used in conjunction with the following data types to create full
XYZ hydrographic data using the SonarW7 software package….

Total Station XYZ data plus Time

XYZ data from RTKGPS plus Time

XY data from DGPS plus Tide plus Time

Range and Bearing from hand held laser plus Tide plus Time

Simple event marking past known position markers
The basis on which all data correlation is achieved is internal time base, so
particularly when using the SonarMite with GPS data the clocks should be
synchronised to GPS time (UTC).
Sound Velocity Settings
The SonarMite default Speed of Sound in Water(SoS) setting is 1500m/second,
facilities to vary this have been provided in the calibration or in post processing. In
practice this velocity value can vary due to several factors …

Water Temperature

Water Salinity

Water Turbidity
All of the above factors vary the density of the water in some way and effect the „time
of flight‟ of a pulse of ultrasound in water and hence the depth calculated from this
time by the SonarMite. The user can either measure the speed of sound in water by
taking velocity profiles using a dedicated velocity measuring device or can use the
SonarMite static over a known depth to a flat, firm base and then compare the
measured value with the known depth. The difference in Sound Velocity between
warm fresh water and cold salt water is about +/-30m/Second which represents a
change of depth of +/-2%, this must be viewed in context with typical depths of the
survey, if a typical depth is 10m then the error could be about 20cm. The Sound
Velocity setting is the largest source of measurement error when care is not
taken in setting it correctly.
Internal Battery Charging
The SonarMite BTX is fitted with an internal sealed Nickel Metal Hydride battery
which provides 2.8Ahr @ 10vDC and a mains powered battery charger capable of
bulk and float charging to give the most efficient battery cycle. The user should avoid
running the SonarMite until the batteries are completely flat as there will be a high
risk of both data loss and permanent damage to the batteries. The charger will
illuminate CONSTANT RED when bulk charging and FLASHING YELLOW when
charged, the charger illustrated may change if a local mains variant is required.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
CHARGE SEQUENCE
MEASURE BATTERY
1
READY(flashing)
CHARGE(on)
POWER(on)
READY
CHARGE
POWER
CHARGE
2
DISCHARGE
CHARGE(on)
POWER(on)
READY
CHARGE
POWER
FINISHED
3
DISCHARGE
DISCHARGE
READY(flashing)
POWER(on)
READY
CHARGE
POWER
DISCHARGE SEQUENCE
DISCHARGE BATTERY
1
DISCHARGE(on)
POWER(on)
READY
CHARGE
POWER
FINISHED
2
DISCHARGE
DISCHARGE
READY(flashing)
POWER(on)
READY
CHARGE
POWER
WARNING - Only the correct charger should be used with the SonarMite
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
Reverse Voltage Protection
The SonarMite SPx is protected from reverse connection or direct short circuit by an
internal diode and 1 Amp thermal fuse. If the fuse is tripped then the system will need
to be disconnected for 1 minute for the fuse to cool down and reset itself.
Weatherproofing
The SonarMite has been designed to conform to the IP65 waterproofing standard, this
benchmark describes equipment which can withstand a light spray of water from a
hose for a short period of time, it does not imply the device is suitable for immersion
in any depth of water or exposed to prolonged harsh weather conditions. The
weatherproofing also assumes the connectors or cover caps are fully screwed on to
their rubber sealing rings. The weatherproofing does not apply to certain components
which are by definition not designed for outdoor use such as the mains battery charger
and D9 serial cable connectors.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
DEPTH TRANSDUCER
The SonarMite system uses a „boat‟ shaped P66 transducer in a „knock off‟ fitting for
fixing to the transom of a light boat or more commonly in a temporary mounting
using a survey detail pole. The transducer includes a unique processor and is not the
same device as the commercially available transducer from Airmar.

Hydrodynamic shape provides vertical sound beam orientation on hull
deadrise angles up to 30

Reversible wedge allows mounting to transom angles from 2 to 22

Integral release bracket protects against impact damage, mounts with 3 screws,
and provides 12 mm of vertical adjustment

Chemical and impact resistant plastic housing

Designed to meet CE requirements

Shielded piezoceramic element for noise free echo sounder display

Standard minimum cable length: 5.0 m (16 feet)
Transom Mounting Transducer
Transducer Mounting
When mounting the transducers the following points should be taken into
consideration …



How near to the Metacentre of the boat is the transducer
Is any turbulence generated around or in front of the transducer when moving
Is the turbulence from the propellers in the field of view of the transducer
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
The only important consideration in mounting is that the transducer is always in the
water and that the transducer does not represent an obstacle when the boat is used at
higher speeds (i.e getting to the survey location). If at all possible mounting the
transducer directly below the positioning antenna reduces the calculation of X/Y
offset to zero.
Example Transducer Mountings
Typical rubber boat mounting
Avoid Stressing Transducers
The Active Transducers include piezoelectric elements which are embedded within a
resin compound. If the user has to fabricate a custom mounting for the transducer (a
very common requirement given the vast permutations of boats in which surveys are
performed) avoid using a fixing technique that causes physical stress in the transducer
body as this will change the resonant properties of the device and effect its depth
measuring accuracy.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
BLUETOOTH INTERFACE
The SonarMite deck box provides a fully compliant wireless Bluetooth™ Class 1
Master and Slave function via a simple UART or RS232 interface. The Bluetooth
Wireless will provide connectivity to any device supporting either a UART or RS232
interface. The SonarMite Bluetooth Serial is compatible with all other device
supporting Bluetooth™ SPP (Serial Port Protocol).
BlueTooth ID/Password code
In some instances the local Bluetooth interface may request a password/ID to set up
pairing with the device, for BTX/SPX version devices the pin number is always set to
‘1234’ (numeric - one two three four).
Typical PC Bluetooth software
Bluetooth™ Serial Port Profile
Bluetooth Serial provides either a Bluetooth™ slave or master connection fully
supporting the (SPP) Serial Port Profile …
Features

Fully Bluetooth™ Class 1 v1.1 SPP compatible

Wireless range of over 100m (330ft)

Integrates with RS232 or UART systems.

Small footprint

Platform independent

Various low power sleep modes

SMA Antenna connection for direct antenna connection or coax
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
The SonarMite Bluetooth Serial Terminal encapsulates all of the Bluetooth™
protocols on a single chip, providing a simple serial interface to the host, therefore
removing any need for software drivers or experience in developing wireless
technology
Bluetooth - actual range of the device.
The device uses Bluetooth class 1. The range will depend on the other Bluetooth™
device that it is connected to. It will also depend on the physical environment ie)
obstructive walls and the type of walls the signal will need to go through and on the
antenna that is fitted. Assuming it is connected to a class 1 device then the maximum
range should be between 50 and 150 meters.
Connecting to another Bluetooth™ PC/PDA
The Bluetooth Serial Terminal will connect to any Bluetooth™ enabled device
supporting SPP. This can be in MASTER mode, where the terminal initiates the
connection, or SLAVE mode, where the remote device initiates the connection. The
method of connection will vary depending on the remote device. However, generally
the other device will perform a four stage process.

The remote device will “discover” other Bluetooth devices. The Bluetooth
device will appear as “SMnnnnnn” (where nnnnnn is serial number).

The remote device will need to “Pair” with the SonarMite Bluetooth. The pin
number is then entered.

The remote device will connect to the serial port service of the SonarMite
Bluetooth Serial Terminal.

A virtual “Outgoing” communications Comm port will then generally be
created and the application can then talk over this port to any connection to the
SonarMite Bluetooth Serial Terminal.

WHEN CONNECTED THE RED LED WILL ILLUMINATE AND
FLASH CONTINUOUSLY
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
SERIAL INTERFACE
In addition to Bluetooth on the BTX all SonarMites have a serial interface which can
connect to a computer using RS232 protocol. The default settings are …
4800 Baud Rate 8 Bit 1 Stop Bit No Parity
Example Serial Cable
Example USB adaptor cable
Using the slower baud rate of 4800 allows the serial cable to be extended so that the
computer can be up to 20m away from the echo sounder.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
Typical Windows HyperTerminal settings



Hyperterminal ASCII settings


Hyperterminal Connection settings
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
CONNECTIONS
The only accessible connectors on the SonarMite are those on the front of the machine
referred to as the „Transducer or TXR‟ and „Computer or PC‟ connections. There are
no user connections or serviceable parts within the SonarMite body itself.
‘PC’ or Computer connection
This 6 way female connector is used to connect to either a PC serial connection or for
an incoming message in the „polled‟ mode connection.
‘Transducer’ connection
This 6 way male connector is used to connect to the SonarMite transducer, the same
connection is also used for the battery charger connector.
Transducer and Computer connections
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
APPENDIX
SonarMite Settings
The SonarMite when connected via Bluetooth to a serial communications program
such as Hyperterminal has a basic set of simple single character commands used to set
the basic parameters of the instrument.
Flash Memory
The instrument contains an area of configuration data held within its semi-permanent
FLASH memory area. On running the instrument this data is copied into the current
working RAM area of the processor. Pressing any of the configuration command
characters will only change the current active states enabling the user to sample
output unil the „Save‟ command is used to store the current settings and make them
the new defaults when the system is rebooted.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
BTX/SPX version Commands
☺(^H)elp
Pressing ^H (Contol H) will display the following help information as an aid memoir
to the available commands…
^Help,Format,Version,Id,Save,[Reset,Load,U/Dsos]
Commands shown in parenthesis [ ] are only available in the SYS> format.
Memory Operations
☺ (^R)eset
Pressing ^R (Contol R) will reset the SonarMite to its default values, these values are
saved in Flash memory and set in current working RAM memory (only available in
the SYS> output mode).
☺ (^L)oad
Pressing ^L (Contol L) will reload the Flash memory into the current working
memory. (only available in the SYS> output mode).
☺ (^S)ave
Pressing ^S (Contol S) will save the current working memory area to Flash memory
to become the system settings on reboot.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
General Operations
☺ (?) Query format
Pressing ? will reply with current output formats as below …
Old SonarMite
Simple ASCII
DBT NMEA
DPT NMEA
Odom SBT
DESO 25
Polled
System
New SonarMite
☺ (^F)ormat
Pressing ^F (Contol F) will toggle the output formats as below …
Format 0 Old SonarMite format with null HPR (e.g. 1 1.88 0 0 0.0 12.7 128 20)
1 0.48 0 0 0 8.9 115 0
1 0.48 0 0 0 8.9 115 0
1 0.48 0 0 0 17.8 116 0
1 0.48 0 0 0 8.9 115 0
1 0.48 0 0 0 8.9 115 0
Example Standard Sonarmite Output
Output Parameters
Output message is eight numeric ASCII parameters, floating format, space delimited as ...
id depth roll pitch heave battery qa flags<cr><lf>
where ...
id = The id number of the instrument (0..7)
depth = current measured depth (m)
roll = current roll lateral atitude (+/-deg)
pitch = current pitch axial atitude (+/-deg)
heave = current heave depth correction (m)
battery = current battery condition (v)
qa = current depth relative qa value (0=null, 70=poor, 128=best)
flags = binary toggle flags 1=^X, 2=^Y, 4=^A, 16=^Z, 32=^G
Please note that if no transducer is seen or the qa is below 5 (out of water) then the output will appear
as a string of 8 nulls at 1 second timeouts, in normal operation the eight numbers are reported at 0.5
second intervals.
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
Format 1 Simple ASCII mode (e.g. 1.92 )
0.48
0.48
0.48
0.48
0.48
0.48
0.48
Example Simple ASCII Output
Format 2 DBT NMEA mode (e.g. $SMDBT,5.94,f,1.81,M,,*67)
$SMDBT,1.6,f,0.48,M,,*5C
$SMDBT,1.6,f,0.48,M,,*5C
$SMDBT,1.6,f,0.48,M,,*5C
$SMDBT,1.6,f,0.48,M,,*5C
$SMDBT,1.6,f,0.48,M,,*5C
$SMDBT,1.6,f,0.48,M,,*5C
Example NMEA DBT Output
Format 3 DPT NMEA mode (e.g. $SMDPT,1.81,0.0*66)
$SMDPT,0.48,0.0*62
$SMDPT,0.48,0.0*62
$SMDPT,0.48,0.0*62
$SMDPT,0.48,0.0*62
$SMDPT,0.48,0.0*62
$SMDPT,0.48,0.0*62
Example NMEA DPT Output
Format 4 Odom SBT mode (e.g. et
et
et
et
et
et
et
47)
47
47
47
47
47
47
Example Odom Output
Format 5 Deso 25 mode (e.g. DA 0.48 m)
DA
DA
DA
DA
DA
DA
0.48 m
0.48 m
0.48 m
0.48 m
0.48 m
0.48 m
Example Deso Output
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
Format 6 Polled mode (e.g. any text line in here 0.48 116)
any text line in here 0.48 116
Auto0163,1001.850,999.890,102.771,23.01.2009,15:49:32.9 0.48 115
$GPGGA,155147.9000,1000.2431,N,1001.7700,E,1,05,1.0,102.7566,M,0.0,M,0.0,0001*99
0.48 115
0.48 115
0.48 116
Example Polled Output
Format 7 mode used for system settings
SYS> 54
SYS> 15
SYS> 13
SYS> 14
SYS> 14
SYS> 14
0.48 109 109
0.48 109 109
0.48 109 109
0.48 109 109
0.48 109 109
0.48 109 109
0 116 1500
0 116 1500
0 115 1500
0 116 1500
0 116 1500
0 116 1500
0.2
8.9
8.9
8.9
8.9
8.9
0
0
0
0
0
0
Example System Output
Format 8 New SonarMite format (e.g. 1 1.88 12.7 128 20)
1 0.48 8.9 115 0
1 0.48 8.9 115 0
1 0.48 8.9 115 0
1 0.48 8.9 115 0
1 0.48 8.9 115 0
1 0.48 8.9 115 0
1 0.48 8.9 115 0
Example New SonarMite Output
☺ (^V)ersion
Display the current firmware version number
nSonarMite v3.01(c)2009 LYMTECH
☺ (^I)d
Toggle the ID number of the instrument. This function is intended for use in multiple
transducer systems running in polled mode.
☺ (^U)p
Increase the sound velocity setting for dense cold water (only available in the SYS>
output mode).
This is a dangerous function and will change calibration values if saved
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SonarMite BTx/SPx v4.02 © 2013 Lymtech LLC
☺ (^D)own
Decrease the sound velocity setting for lighter fresh/warm water (only available in the
SYS> output mode).
This is a dangerous function and will change calibration values if saved
☺ (^C)lear
Reset output to format 0. (used by external programs).
☺ (^B)
Set output to new format 8. (used by external programs).
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