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在数据中继卫星系统中，为保证用户星和中继星间的通信，用户星天线要精确指向中继星。由于天线指向系统和姿态控制系统间存在动态耦合，天线桅杆又有拉伸和扭转变形，所以仅靠卫星的姿态控制不能达到要求的指向精度，必须采用独立的指向控制系统。本文针对这一情况，首先分析了用户星天线指向跟踪信号，并设计单轴天线控制器。仿真结果表明，用典型跟踪信号作为输入，可得到满意的跟踪精度。
In the data relay satellite system, in order to ensure the communication between user and relay stars, the user’s satellite antenna must be pointed exactly at the relay star. Due to the dynamic coupling between the antenna pointing system and the attitude control system, the antenna mast has tensile and torsional deformation. Therefore, the satellite pointing attitude control can not achieve the required pointing accuracy. An independent pointing control system must be adopted. In this paper, we first analyze the pointing signal of the user’s satellite antenna and design a single-axis antenna controller. Simulation results show that using a typical tracking signal as an input, a satisfactory tracking accuracy can be obtained.