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2. MAINTENANCE, TROUBLESHOOTING
2-10
Note: Detection of RX malfunction
1) Detection of TDMA RX malfunction
Frequency error
PLL chip on receiver board generates lock or unlock signal for
synthesizer.
MPU watches and sets status flag which reflects data of ALR sentence.
ID 003 for RX1, ID 004 for RX2
2) Detection of DSC RX malfunction
General error
DSC Error (ID: 005) will happen in case of DSC MPU could not receive
format specifier of the data from DSC amplifier unless RSSI exists more
than 90 seconds.
2.7 GPS Monitor
The GPS monitor display shows information about the built-in GPS receiver,
including position, speed over ground, course over ground, date, time, mode
position accuracy, position-fixing status and RAIM status.
1. Press the MENU key to open the menu.
2. Use the CursorPad to choose INTERNAL GPS and then press the ENT
key.
[INTERNAL GPS]
LAT : 34
°
44.4639'N
LON : 135
°
21.2395'E
SOG : 10.9 kt COG : 98.9
UTC : 16/MAY/2004
06:29:02
DGPS STS: 3D
PA: H RAIM: USE
Latitude position
Longitude position
Speed over ground, Course over ground
Date
Time
Mode
DGPS
GPS
NO FIX
Position Accuracy
H: High, L: Low
STS (Status)
2D:
2D GPS position fix
3D: 3D GPS position fix
D2D: 2D DGPS position fix
D3D: 3D DGPS position fix
DOP: HDOP larger than 4 in 2D fix,
or PDOP larger than 6 in 3D fix
RAIM Status*
(Receiver Autonomous
Integrity Monitoring)
USE or UNUSE
*RAIM: Technique whereby the GPS receiver verifies the integrity
of the signals received from the GPS constellation.
Internal GPS monitor
3. Press the DISP key to close the display.