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High precision space-borne Point-targer trajectory tracking system,the point target position is simplified into a data packet with polynomial coefficients,which is sent to the satellite remote sensor pointing control unit from the ground control system.The pointing control unit and time management unit analysis time parameter and coefficient parameter in data packet,and control pointing mirrior mechanism for motion,autonomous tracking point target trajectory.This method improves the tracking accuracy of the tracking system,reduce the pressure of bus communication.The tracking accuracy of the system is much better than that of the traditional target tracking method.