基于GPS的星地激光通信捕获对准研究

Research on acquisition and pointing in optical communication between satellite and ground station based on GPS

提出了基于GPS坐标解算实现星地激光通信捕获、跟踪和对准(ATP)初始捕获的方法。星地激光通信信标光跟踪系统通过对地面GPS坐标和卫星坐标的解算,得到地面光学天线的方位角和俯仰角,光学天线根据角度旋转对准信标光,从而将信标光引入粗跟踪CCD的视场。给出了GPS坐标解算算法和信标光方向角度随卫星坐标变化的仿真曲线。用二维电机进行了地面转台的捕获实验,对实验数据进行了捕获精度的分析,结果表明,通过GPS坐标解算能够快速地实现信标光的初始捕获。

An initial acquisition method in ATP of optical communication between satellite and ground station is proposed based on GPS coordinate calculation.Block diagrams of the beacon tracking system are presented first.By calculating the coordinates of GPS and satellite,the optical antenna′s azimuth angle and elevation angle are obtained.According to the angles obtained the optical antenna is rotated to aim at the beacon and leads it into the view field of CCD in coarse tracking.The GPS coordinates is calculated and the stimulation curves of the azimuth angle of beacon vs the satellite coordinates are presented.A two-dimensional electric motor is adopted in the acquisition experiment of rotary platform.Based on the collected data,the initial acquisition of beacon can be achieved rapidly by GPS coordinate calculation.