通过分析二维转台与卫星平台的耦合运动引起粗瞄误差的变化规律,讨论耦合运动对信标光光场分布的影响,进而提出补偿方案以保证卫星光通信系统的性能.通过数值仿真得到:对于主转动惯量小于100kg·m2的卫星平台耦合运动引起的粗瞄误差较大,导致目标卫星接收到的信标光功率下降,系统冗余大幅度下降,应采取补偿方法消除粗瞄误差保证系统性能:对于主转动惯量为l00kg·m2:1000kg·m2的卫星平台,当瞄准角较小时耦合运动引起的粗瞄误差较小,可不予补偿,瞄准角较大时耦合运动引起的粗瞄误差较大,应采取相应的补偿措施;对于主转动惯量为＞1000kg·m2的卫星平台耦合运动引起的粗瞄误差可忽略不计.

In this paper, the coupled motion of optical communication terminal and the satellite platform and its impact on the error of coarse pointing are studied The influence of the coupled motion on the distribution of the beacon optical filed is also analyzed When the moment of inertia of satellite platform is less than 100 kg-m2, the coupled motion induced beacon pointing error will reduce the received optical power and system redundancy greatly. Compensation processing must be required in this condition. When the moment of inertia of satellite platform is between 100 kg·m2 and 1000 kg·m2, the coupled motion induced beacon pointing error becomes less. Compensation processing must be used when the pointing angle is bigger. When the moment of inertia of satellite platform is more than 10000 kg·m2, the pointing error could be neglected.