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为了优化GEO与LEO间激光通信系统的性能,建立了卫星通信轨道特性仿真模型。通过对一年内卫星数据的分析可知,卫星通信终端间的多普勒频移变化范围约为±5×109 Hz,可以使用多普勒频移补偿方法减少GEO与LEO之间的多普勒频移影响。对于相干通信,终端必须进行频移补偿;提前量角的范围大于激光束散角,因此终端需要进行提前量补偿,激光通信系统可根据提前量角对视轴进行提前修正,以减少相对速度对激光通信的影响;太阳干扰和地球遮挡的时间较长,应该进行卫星组网以改善可通率,在通信过程中应根据通信终端时间,优化两个通信终端的工作流程;GEO和LEO终端的视轴变化情况不同,因此应该为卫星设计不同结构。
In order to optimize the performance of the laser communication system between GEO and LEO, a simulation model of satellite communication orbit characteristics was established. Through the analysis of satellite data within one year, it can be seen that the range of Doppler shift between satellite communication terminals is about ± 5 × 109 Hz. The Doppler shift compensation method can be used to reduce the Doppler frequency between GEO and LEO Move affected. For coherent communication, the terminal must perform frequency offset compensation; the range of the advance angle is larger than that of the laser beam, so the terminal needs to compensate for the advance. The laser communication system can correct the visual axis ahead of time according to the advance angle to reduce the relative speed. Laser communications; solar interference and the Earth’s occlusion for a long time, the satellite network should be improved to improve the pass rate, the communication process should be based on the communication terminal time, optimize the work of the two communication terminals; GEO and LEO terminal The boresight changes differently so different structures should be designed for the satellite.