用户星天线指向控制设计初探

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。

DESIGN OF ANTENNA POINTING CONTROL SYSTEM FOR USER SATELLITE

In order to maintain high antenna gain and to decrease interference from other beams, the antenna of user satellite must point to Tracking Data Relay Satellite (TDRS) accurately. However, it is difficult to achieve high pointing accuracy by attitude control alone, because of the pointing error caused by the deformation of antenna mask and the coupling between the antenna driving control system and the attitude control system. As the result, it is necessary to control the direction of antenna reflectors independently. In this paper the track pointing signal of user satellite is studied, and a SISO controller is designed. A simulation test is given to demonstrate the pointing error with this controller. It is shown to be a satisfied controller.