自由光通信中卫星相对运动的补偿设计

分析了不在同一轨道平面的光通信终端搭载卫星的相对运动模型,通过对终端万向节指向的补偿校正来提高扫瞄捕获概率,缩短激光链路的建立时间,并对通信过程中的接收光束在电荷藕合器件靶面坐标系中的坐标值进行修正,减弱对快速倾斜镜的高带宽限制.最后对相对运动模型进行解算,依据方案对捕获和跟踪过程的补偿设计进行数值仿真,结果表明本设计方案可以消除由于卫星相对运动引起的光束指向偏差.该方案简化了系统结构,降低了系统复杂性,减少了能量消耗,同时易于星载计算机程序实现.

Compensation for Inter-satellite Relative Motion of Free-space Optical Communication

The relative motion of communication satellites which are not on a plane was analyzed.The acquisition probability and acquisition time was improved by compensated the point angles for terminal gimbal.And the charge coupled device target plane coordinates which decided by the receiving laser beam were modified to reduce the constraint for fast steer mirror.Numerical simulation resolving the relative motion model compensates the excursion to antenna rotation angles and charge coupled dirice coordinates.The curves show that the relative motion can be eliminated depending on compensation model analysis.The system structure was simplified that not needs to consider actuator cooperation with other device.That decreases the complexity of the whole system and saves energy.And numerical compensation method is convenient to realize for satellite computer program.