多普勒效应下星间光通信系统的仿真性能分析

Performance Analysis of Satellite Optical Communication System under Doppler Effect

构建卫星光通信系统的仿真模型,在不同信道传输环境下,对相干和非相干检测下的卫星光通信系统性能进行了分析比较。结果表明:在具有相同的轨道的星间光链路之间,由于相对速度恒定,不存在多普勒效应,采取相干检测下的系统误比特率要小于非相干检测下的系统误比特率;当卫星处于不同的轨道时,存在多普勒效应,相干检测下的系统误比特率要远远大于非相干检测下的系统误比特率;在现有的条件下,当存在多普勒效应时,宜采用非相干检测来进行检测解调。

This paper attempts to establish a satellite optical communication system simulation model and present the idiographic channel parameters. The satellite optical communication performances in various transmission environments are compared and analyzed in terms of the coherent and non - coherent examination. The simulation results in- dicate that the BER in terms of the coherent examination is lower than that of non - coherent examination in the situation of the same orbit Inter- satellite optical links; the BER（ Bit Error Rate） in terms of the coherent examination is higher than that of non - coherent examination in the situation of the different orbit Inter - satellite optical links. For the moment, the non - coherent examination is the better sort in satellite optical communication when the Doppler effect exists.