中文摘要：

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。

英文摘要：

The influence of pointing error induced wave-front mismatch on the optical coherent efficiency and the ensued degradation of the performance in satellite coherent laser communication systems are analyzed.The relationship between the dynamic pointing error and the signal-to-local-oscillator field coherence is a key factor to bit error probability of coherent optical communication systems,and the classic link equation is modified by inducing coherent efficiency variable.The theoretical analysis and simulation calculations reveal that the performance of a coherent communication system is affected by pointing error induced wave-front mismatch.An optimized receiving aperture is found by simulation on the LEO-GEO scenario.The suggested receiving aperture is 0.5 m in the sense of 0.5 μrad pointing error.