The onboard TTC antennas are important components of the TTC subsystem,and are critical for the link between GEO satellite and earth station.According to the specialties of the GEO satellite,some principles to design the TTC antennas are taken forward.The coverage of elemental antenna is addressed,and two cases to increase the coverage are put forward.The coverage of antennas for duel channels non-coherent TTC and for duel channels coherent TTC are discussed.Finally,the needed onboard resources and acquired benefits for both non-coherent TTC and coherent TTC are compared.The results show that both of cases can increase TTC coverage for GEO satellite.The results show that both of cases can increase TTC coverage for GEO satellite.%星载测控天线是地球静止轨道卫星测控分系统的重要组成部分,对于星地测控链路通畅至关重要。根据地球静止轨道卫星测控任务的特点,简要介绍了测控天线的设计原则;基于单副天线的覆盖区分析,提出了采用两副天线组阵工作以提高测控信号覆盖区的建议,并分析了两副单元天线异频组阵与同频组阵工作模式,提高测控天线覆盖区的技术方案及对测控天线覆盖区的改善情况,对比给出了每种方案所占用的卫星资源及需要付出的代价。结果表明,两种技术方案均可提高卫星测控覆盖区。
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