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Tactical Data Links

Model, simulate and analyze the performance of a tactical data link for a national aerospace company Model, simulate and analyze the performance of a tactical data link for a national aerospace company
  • 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 comprehensive set of simulation runs was conducted to evaluate system performance across a wide range of input parameters. Key observations from the analysis of simulation results include:

  • Signal Quality Issues:
    • The RF propagation losses resulted in a high Bit Error Rate (BER).
    • This high BER led to an unacceptable number of errors in Recognized Air Picture (RAP) packets.
  • Resource Allocation Inefficiency:
    • The current round-robin slot allocation method didn't provide immediate time slot availability for the Ground Station (GS).
    • This inefficiency potentially impacts real-time communication capabilities.

Conclusions and Recommendations

  1. Optimize Data Transmission:
    • Reduce the size of Recognized Air Picture (RAP) packets to mitigate the impact of high BER.
    • This should decrease the overall error rate in RAP data transmission.
  2. Enhance Resource Allocation:
    • Transition from the current round-robin method to an optimized slot schedule.
    • Prioritize slot allocation for the Ground Station (GS) to improve responsiveness.
  3. Future Enhancements:
    • Consider implementing Layer 3 routing in future iterations.
    • This addition could facilitate more efficient communication between different network segments.