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星载大口径反射面天线运动扫描中会产生较大干扰力矩,对卫星平台姿态稳定造成较大影响。研究了天线副反射面运动扫描技术,在卡塞格伦天线系统中固定主反射面和馈源系统,通过运动副反射面实现波束扫描。卡塞格伦天线副反射面扫描运动中,每个特定扫描角度存在方向图性能恶化程度最低的最佳副面位置,运用射线优化法对各扫描角度对应的最佳副面位置进行求解。文中给出了设计流程,通过软件进行仿真设计,加工了天线测试系统并进行方向图测试,验证了设计方法的正确性。
The satellite large-aperture reflective surface antenna scanning will have a larger interference torque, pose a greater impact on the satellite platform attitude stability. The antenna scanning technology of secondary reflective surface is studied. The main reflecting surface and the feed system are fixed in the Cassegrain antenna system, and the beam scanning is realized by the secondary reflecting surface. In the scanning movement of Cassegrain antenna’s secondary reflecting surface, the best secondary position with the lowest degree of deterioration of the pattern performance exists at each specific scanning angle, and the best secondary position corresponding to each scanning angle is solved by ray optimization method. The design flow is given in this paper, the simulation design is done by software, the antenna test system is processed and the test pattern is tested, which proves the correctness of the design method.