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GPS Data Module and Encoder
An application specific GPS receiver module and FSK encoder. The device outputs dynamic GPS serial data messages in NMEA format converted to FSK audio tone modulation. This device enables GPS data to be relayed via a wireless video link to the ground receiving systems via the audio channels simultaneously with the video.
The data o/p is also supplied in RS232 format for connecting to external instruments e.g. Flir camera for symbology information. The module has an external antenna feed.
Using standard input dc power (9 to 30 volts dc) it is ideally suited to digital video link systems using standard audio data channels for the GPS relay.
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Receiver Type |
L1 frequency, C/A code, 16 Channels |
Position Accuracy |
w/o aid 3.3m CEP |
Start-up Time |
Hot start < 3s |
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Warm start 35s |
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Cold start 41s |
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Reacquisition Time < 1s |
Acceleration |
< 4g |
Update Rate |
1Hz |
Timing Accuracy |
50ns RMS |
Sensitivity |
Acquisition -140dBm |
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Tracking -149dBm |
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RS232 NMEA, 0183 ASCII 4800 Baud (alternative baud rates available)
FSK Tone modulation ~ 5KHz line level
Default messages (with sample date)
$GPGLL, 5226.12614, N, 00101.89626, W, 091809.00, A, A*72
$GPRMC,091810.00,A,5226.12611,N,00101.89626,W,0.028,20.33,031105,,,A*46
$GPGGA,091810.00,5226.12611,N,00101.89626,W,1,7,1.07,167.2,M,47.3,M,,*79
$GPZDA, 091809.00, 03, 11, 2005, 00, 00*6B
Power – 3 way MIL style
Function |
PIN # |
Power: 10 -36V dc
• 12 VDC @ < 100mA
• Reverse polarity protected
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+12 Volts DC (10-36V) |
A |
0 Volts (GND) |
B |
Case/chassis bond |
C |
Function |
PIN # |
• RS 232 NMEA output ASCII @ 4800 baud
• RS 422 NMEA output ASCII @ 4800 baud
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| 5V (100mA) output |
1 |
| NMEA RS232 output |
2 |
| RS232 input (reserved) |
3 |
| Common 0V |
4 |
| Common 0V |
5 |
| FSK data output - high |
6 |
| FSK data output - low |
7 |
| Screen/Case |
8 |
| 1 pps timing reference |
9 |
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