A Link22 application scheme based on low orbit satellites

Aiming at the problem that the existing Link22 data link information transmission is constrained by the visual distance, this article proposes an application scheme for deploying Link22 node on low orbit satellites to achieve over the horizon transmission of tactical information in the sea area. The scheme extends the transmission distance of Link22, improves the efficiency of tactical information transmission, and enhances the situational awareness range of surface warships. Aiming at the problem of the application scheme the that the high-speed movement of LEO satellites results in a significant Doppler frequency shift in the received signal of the space borne Link22 node, and the longer propagation distance of satellite-ship links results in the propagation delay greater than that of Link22 sea surface nodes, this article analyzes the impact of Doppler frequency shift and long delay on satellite-ship links, and proposes Doppler frequency shift pre-compensation and time slot correction schemes. The experimental results of star-ship link show that the OPSK bit error rate test value after time-frequency synchronization using this scheme is close to the theoretical value, and when the bit error rate is 10⁻⁶, the signal-to-noise ratio difference is within 0.5 dB, preliminarily proving that the proposed Doppler frequency shift pre-compensation and time slot correction schemes are correct and demonstrating that the proposed Link22 application scheme based on low orbit satellites is preliminarily feasible.