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。 A new method of acquiring, tracking and aligning (ATP) initial acquisition based on GPS coordinates is proposed. The satellite laser communication beacon light tracking system obtains the azimuth and elevation angles of the terrestrial optical antenna by solving the GPS coordinates and satellite coordinates on the ground. The optical antenna rotates the beacon light according to the angle to introduce the beacon light into the coarse Track CCD field of view. The simulation curves of GPS coordinate calculation algorithm and beacon light direction angle with satellite coordinates are given. Two-dimensional motor was used to capture experiment of terrestrial turntable, and the experimental data was analyzed for acquisition accuracy. The results show that the initial capture of beacon light can be realized quickly by GPS coordinate solution.