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Tactical Data Links

- A Ground Station (GS) is connected to the Early Warning Radar (EWR), via ground network infrastructure
- The GS starts up the network, does the time slot assignment, generates the crypto key and the frequency hopping pattern
- GS then broadcasts the Air Picture to all friendly aircraft
- Friendly aircraft broadcast their positions periodically to one another and to the GS
- When enemy aircraft is detected by the EWR it transmits information to the GS
- GS in turn broadcasts the updated Air Picture to friendly aircraft, which then engage the enemy
Parameter | Value |
---|---|
Grid Length 300x300 km | Slot Duration 50 ms |
Encryption | AES256 |
Bits per slot | 2500 bits |
RF Power | 20 W |
Modulation | QPSK |
RX Sensitivity | -108 dbm |
Performance Analysis
A set of simulation runs covering a wide range of input parameters were run to study the system performance. Some of the observations discovered after an in-depth analysis of the simulation results were -
- With the low bit rates available and with RF propagation losses too many Air Picture packets
- Time slots were not immediately available for the GS given the round robin slot allocation
Conclusions
- Reduce the Recognized Air Picture (RAP) packet size
- Move from a round robin to demand based slot allocation
- Layer 3 routing could be added in the future for communication between nets