降低随机振动对卫星激光通信光纤耦合影响的补偿算法

Compensation algorithm for reducing the influence of random vibration on fiber coupling in satellite laser communication

为了补偿卫星平台随机振动引起的空间光-单模光纤耦合效率损失,对比分析了基于章动算法和随机并行梯度下降(SPGD)算法的参数选取对算法稳定性和收敛速度的影响,并在典型卫星振动谱条件下对2种算法的补偿效果进行了评估。仿真结果表明:章动算法补偿后的平均耦合效率为81.26%,均方根误差为7.2×10^-4;SPGD算法补偿后的平均耦合效率为80.72%,均方根误差为1.9×10^-3。相比于SPGD算法,在最优情况下章动算法的均方根误差降低了62.1%,其稳定性更好。

In order to compensate for the coupling efficiency loss of space optical-single mode fiber caused by random vibration of satellite platform,the influence of parameter selection based on nutation algorithm and random parallel gradient descent(SPGD)algorithm on the stability and convergence speed of the two algorithms is compared and analyzed.The compensation effects of the two algorithms are evaluated under typical satellite vibration spectrum conditions.The simulation results show that the average coupling efficiency of nutation algorithm is 81.26%,and the root mean square error is 7.2×10^-4;the average coupling efficiency of SPGD algorithm is 80.72%,and the root mean square error is 1.9×10^-3.Compared with SPGD algorithm,the root mean square error of nutation algorithm is reduced by 62.1%in the optimal case,and its stability is better.