GPS TRANSMITTER
The GNNS tracker along with its telemetry unit consists of telemetry and ground receiver station.
The transmitter (tracker) unit consists of GPS receiver to receive its co-ordinates from the satellite and a transmitter to transmit the Latitude, Longitude and Time of Day parameters after required modulation.
The transmission is in L band frequency.
GNNS Tracker & Telemetry Ground Station
The ground station consists of RF receiver and GPS receivers along with the display unit. The Receiver co-ordinates data from the transmitter is computed with the ground receiver, GPS co-ordinates and the distance between the transmitter and the ground station is displayed along with the direction of arrival of the signal (Bearing angle). System operates on 28V DC supply from the torpedo GPS to the receiver system. The receiver unit should display all these parameters in real time.
Application :
The Global navigation satellite system (GNSS) tracker & its telemetry is installed at the Nose of the torpedo unit and it is dropped from the helicopter. GNSS system will give the distance from the torpedo to the receiver at the ground station& the angle of the direction of signal arrival.
- GNSS Receiver Feature
| Number of Channels | 72 | |
| GNSS Constellations | GPS L1 C/A , GLONASS L 10F , Galileo E1 B/C | |
| Maximum Update Rate | 10Hz | |
| Maximum Position Accuracy | Upto 2.5m CEP | |
| Minimum Cold Start Acquisition Time | 26 Seconds | |
| Minimum Reacquisition time after signal loss | 01 seconds | |
| Tracking and Navigation Sensitivity | -161 dBm | |
| Cold Start Sensitivity | -147 dBm | |
| Hot start Sensitivity | -156 dBm | |
| Oscillator Type | Temperature Compensated Crystal Oscillator | |
| Anti-Jamming | CW Detection and Removal. Onboard SAW Filter | |
| Operating Temperature | -40 to 85° C | |
| Antenna Support | Active and Passive | |
| Protocol Support | NMEA | |
| Interface Support | UART/SPI |
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