提出一种改进的激光星间链路终端(LCT)指向误差在轨标定方法,对激光星间链路终端指向误差模型和观测数据获取方法进行改进.针对现有的终端指向误差参数模型误差因素考虑不足的问题,引入相应的误差项描述误差因素影响.针对链路观测法中存在的激励信号受限,不能充分激励误差参数的问题,以捕获过程中指向机构主动摆动时的入射光信号作为激励信号,以系统误差参数的可观测度最大为目标优化设计激励信号.仿真结果表明:经过本方法标定的误差参数经修正后,激光星间链路终端的最大指向误差(方位向)由改进前的867.8μrad下降到改进后的112.1 μrad;最大指向误差(俯仰向)由改进前的62.1 μrad下降到改进后的51.5 μrad,有效地提高了激光星间链路终端指向精度.%An improved in-orbit pointing error calibration method of laser communications terminal (LCT) is proposed in this paper based on the developed pointing error model and in-orbit data acquisition method.Several pointing error factors are introduced in the model to solve the problem of the incomprehensive modeling of error factors.The excitation signal in the link-observation method excites the pointing error insufficiently due to the limited amplitude.This paper introduces the light signal received during the link acquisition phase while the pointing mechanism is swinging actively as the excitation signal,and further optimizes the signal to maximize the degree of the observability.The simulation results show that a significantly improved pointing accuracy of the laser communications terminal is achieved,with the maximal pointing error (azimuth direction) reduced from 867.8 μrad to 112.1 μrad and the maximal pointing error (elevation direction) reduced from 62.1 μrad to 51.5 μrad.
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