GPS/INS系统误差对空间激光通信对准算法的影响分析

Analysis of influence of GPS/INS system errors on pointing algorithm in space optical communication

为了分析GPS/INS系统误差对空间激光通信对准算法的影响,提出了静止和运动通信终端间激光通信的对准算法。根据XW-ADU5600的系统误差,建立了对准算法模型,分析了位置、姿态、航向误差所引起的对准算法误差,给出了相应的仿真曲线。结果表明:对于静止通信终端的对准算法,大地高误差引起的误差很小,可忽略不计,位置误差引起的误差在方位方向上的分量大于俯仰方向,相差大约一个数量级;对于运动通信终端的对准算法,增加基线长度可以减少误差,姿态和航向误差引起的误差大于位置误差引起的对准误差,且误差与通信终端的当前姿态、航向角以及位置误差的增量方向有关。

In order to analyze the influence of GPS/INS system errors on pointing algorithm in space optical communication, the pointing algorithms in space optical communication between static and moving communication terminals were presented. The model of pointing algorithm was established according to the system error of XW-ADU5600. The pointing algorithm errors caused by position, attitude, and heading errors were analyzed and simulation curves were given. The results show that the altitude error is very small and can be omitted, the pointing errors caused by position errors in azimuth direction are bigger than that in pitching direction as to static pointing algorithms; For moving pointing algorithm, increasing length of baseline will reduce errors and the pointing errors caused by posture and attitude errors are bigger than that by position error. The pointing errors are related with current attitude, heading angle and increment of position errors of communication terminal.