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以星间相干激光通信链路的接收机相干效率为研究对象,分析了动态跟瞄误差对相干效率的影响,将相干效率引入到星间相干激光通信链路方程,推导了跟瞄误差波前失配条件下的相干光通信链路的误码率概率表达式,对卫星激光通信链路中跟瞄对准误差导致的相干效率下降、链路误码性能劣化情况进行了仿真计算。结果表明,由于跟瞄对准误差波前失配的影响,相干激光通信接收终端具有一个优化的接收孔径,在本仿真条件下,LEO-GEO星间链路动态跟瞄误差为0.5μrad时,优化接收孔径为0.5 m,链路可获得最佳误码性能。
Taking coherent interference efficiency of inter-satellite laser communication link as the research object, the influence of dynamic tracking and pointing error on coherence efficiency is analyzed. The coherent efficiency is introduced into the inter-satellite coherent laser communication link equation, Mismatch conditions of coherent optical communication link error rate probability of the satellite laser communication link with the aiming error caused by coherent efficiency degradation, the link error performance degradation simulation. The results show that the coherent laser communication receiver has an optimized receiving aperture due to the mismatch of the alignment errors caused by the wave front misalignment. Under the simulation conditions, when the dynamic follow-up error of the LEO-GEO inter-satellite link is 0.5μrad, Optimal receive aperture of 0.5 m, the link for the best bit error performance.