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.

Specifications
Receiver Type                                      L1 frequency, C/A code, 32 Channels
Position Accuracy                               3.3m CEP
Update Rate                                        1Hz
Sensitivity                                            Acquisition -140dBm
Tracking                                              -149dBm

Data Protocol
RS232 NMEA, 0183 ASCII 4800 Baud
FSK                 Tone modulation ~ 5KHz line level

Default messages (with sample data)
$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

Mechanical:
Dimensions                                                   Weight
Length             100mm                                    50g (approx)
Width               80mm
Height              15mm

Environment
Operating Temperature                      - 40°C ~ 85°C
Storage Temperature                         - 40ºC ~ 125°C