ai s radar receiver user instructions nasa marine

ai s radar receiver user instructions nasa marine
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NASA MARINE LTD
USER INSTRUCTIONS
A. I. S RADAR RECEIVER
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Some vessels do not carry A.I.S.
It is important at all times to keep
a proper lookout. The A.I.S radar is
not a substitue for good seamanship.
CAUTION
Plug the power cable into the rear of the receiver and connect to 12
volts. (The red wire to positive and the wire with the black stripe
to negative. The unit is protected against reverse polarity.)
Unscrew the wing nut from the rear of the receiver and take off the
mounting clamp. Fit the 'O' ring in the groove on the rear and place
the unit in the hole in the panel. Refit the mounting clamp and
finger tighten the wing nut. Alternatively a cradle mounting kit is
available where panel mounting is impractical.
The AIS receiver is not waterproof and should only be cabin
mounted. Select a convenient position for the display on a panel or
bulkhead. The site must be flat and the cavity behind the panel
must remain dry at all times. Cut a hole in the panel 103mm by
143mm wide.
INSTALLING THE DISPLAY
The receiver is designed to operate from a 12 volt supply and
requires a conventional marine VHF antenna (not supplied) and an
input from a GPS receiver to give the user's position.
Vessels carrying AIS transponders are plotted directly onto the AIS
radar display. The tracks of each vessel show the true relative
movement of all targets in the display.
The AIS radar consists of a dual frequency receiver, a powerful
computer and a high contrast display.
INTRODUCTION
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The navigational status symbol shows the vessel's current status. A
complete list of these symbols can be seen by pressing ICONS
from the introduction screen.
Select LIST. This screen shows AIS data received in real time. The
data includes the ship's MMSI number, navigation status symbol
and its latitude and longitude. It is this raw data that is used to plot
on the radar display. It is possible to FREEZE this data for closer
inspection and UNFREEZE it to return to normal.
FROM THE INTRODUCTION SCREEN:
USING THE AIS RADAR
5/
TO SELECT THE SCREEN UPDATE RATE:- select
CONFIG. Pressing UPDATE rosters through the update rates (8,
15, 30, and 60 seconds.) The display shows what update rate is
selected.
4/
TO SELECT AIS CHANNEL:- select CONFIG.
Pressing A/B will alternate between the two channels. The display
shows which channel is selected.
3/ TO SET POSITION SOURCE:- select CONFIG then POS'N.
The screen now shows the position source.
To change:- select GPS to use the GPS position or press STORED
to use the previously stored position. Press BACK to return to the
previous page.
To store a new position:- with GPS connected select STORED
then press SAVE.
To select a vessel as a target press DATA. The closest vessel will
be selected and the target symbol will appear on that vessel.
Selecting NEXT or PREVIOUS will roster through all the vessels
in range order. When the desired vessel is selected its AIS data will
be printed in the data box on the next transmission. (The time
taken to receive the information will depend on how frequently the
vessel transmits an update.)
The AIS radar can track up to 24 vessels. If there are more than 24
vessels in range it will select the 24 nearest the user.
For reference a sample vessel is shown in the data box (just below
the scale) together with its relative speed.
As well as plotting the most recent positions of a vessel the display
shows the last sixteen positions. This leaves a trail on the screen
whose length and direction represent the speed and direction of the
vessel relative to the user. The length of the track is also dependant
on the screen update rate. For example, if the update rate is set to
15 seconds then a vessel will not have moved very far before the
next position is plotted so the track will be short. If the update rate
is 30 seconds the vessel will have moved twice as far each time the
screen updates, so the track will be twice as long.
The radius of the outer ring can be set to 1, 2, 4, 8, 16 or 32
nautical miles. The selected scale is shown in the data box on the
right of the screen. Pressing OK gets out of the zoom option.
Select RADAR to plot all the AIS targets on a simulated radar
screen. Pressing ZOOM followed by IN or OUT will change the
scale.
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From the radar screen press ALARM to turn the alarm on or off.
When the alarm is active an alarm symbol is shown at the top right
of the screen. With alarm selected an audible alarm will sound
when any AIS carrying vessel is within the inner range ring on the
radar screen.
TO SELECT THE ALARM
It can be useful to place the user at a point other than the centre of
the screen. To do this select CONFIG then press BACK and
UPDATE simultaneously. Pressing NEXT will roster the centre
through eight off-centre positions. Pressing CENTRE will return
to the centre.
Note - The selected range is represented by the second range ring.
ADVANCED SETUP
NOTE - TRACKS WILL BUILD UP WHEN IN THE NORMAL
RADAR MODE BUT WILL CLEAR IF THE RANGE IS
CHANGED.
From the radar screen selecting OPTIONS then TRACKS puts
the unit in time lapse mode. This is best appreciated when stationary. The display will now plot tracks of vessels entering the screen
until they leave the screen. After a period of time (and this can be
several hours) a map of shipping routes will emerge.
Select the AIS channel (A or B).
4/
TO SET THE CONTRAST:- select CONTRAST.
Use LIGHTER and DARKER to set the desired contrast.
2/
Select SETUP
1/
TO SET THRESHOLD:- select THRESHOLD.
A horizontal bar indicates the strength of the received signal.
When viewed 'on air' the bar will start from a minimum position
near the left of the screen and will rapidly shoot to the right of the
screen as the short bursts of AIS signals are received. Using the
RAISE and LOWER controls move the threshold setting bar until
it is 1 or 2 stops above the minimum of the signal strength bar.
FROM THE INTRODUCTION SCREEN
Once selected, these settings are held in a non volatile memory.
Select the screen update rate (8, 15, 30 or 60 seconds).
Select the source of user position (from GPS or memory).
3/
5/
Set the display contrast.
Set the receiver sensitivity threshold.
2/
1/
The setup procedure allows the user to:
SET UP PROCEDURE
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BLACK
BLACK
BLEEPER
RED
RED
UTILITY CABLE
BLUE
NMEA OUTPUT
GPS
The receiver requires its own marine VHF antenna and cannot be
shared with a transceiver antenna. It should be mounted as high as
possible to maximise range but should be spaced not less than 1
metre from a transmitting antenna. The antenna cable should be at
least 3 metres long and the antenna should be sited at least 2
metres from the AIS receiver.
INSTALLING THE ANTENNA
Connect the NMEA output (or NMEA +) of the GPS to the BLUE
wire of the UTILITY cable. If the GPS has a NMEA - or NMEA
REF connect this wire to the vessel supply negative. The AIS radar
requires an NMEA 0183 signal with RMC sentence. The signal
level must swing above and below 2 volts.
AIS RADAR
..
12 Volt supply
Plug in the UTILITY cable supplied and, using the terminal block,
connect as follows.
Q - A vessel appears to be jumping back and fourth between two
positions.
A - Probably two vessels with the same MMSI number. This
should not happen as a ship's MMSI number is unique. Check
the LIST, if two vessels share the same number then inform
the relevant authority.
Q - A target vessel shows a heading of 511 degrees.
A - This is a default number signifying that no heading data is
available.
Q - The unit says that no GPS is present.
A - Check that GPS has been set up to send NMEA data RMC
sentence.
Q - I cannot get good contrast on the display.
A - The unit needs at least 9 volts to operate the display properly.
Check the battery voltage.
Q - Signal strength bar is over to the right and hardly moving.
A - You are receiving some interference on that AIS channel.
Switch off all other equipment to isolate source of interference.
Simply changing the AIS channel may solve the problem.
Q - Signal strength bar remains at left of screen.
A - The unit is not receiving any AIS signals. Check VHF antenna.
Q - The screen is completely blank.
A - Check power supply. It should be 12 volts with the centre pin
of the power plug positive.
TROUBLESHOOTING
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