测控设备自跟踪状态稳定性分析及对策

Analysis and Improvement of Self-tracking State Stability of TT&C Equipment

卫星测控是保证通信卫星正常运转的重要手段。为完成通信卫星的测控任务,卫星地面站测控设备除了要求自跟踪系统交叉耦合系数满足技术指标外,还对其自跟踪状态的稳定性提出了要求。通过对自跟踪状态稳定性进行分析,发现和差信道的相位差变化会引起自跟踪交叉耦合系数的变化,进而改变了自跟踪状态的稳定性。考虑到进一步解析导致和差信道相位变化深层次的原因,在不同温度、不同传输电缆长度条件下,采用实验验证的方法,研究了和差相位变化对自跟踪状态稳定性产生的影响,得出了和差相位稳定性与自跟踪稳定性正相关的结论,提出了改善措施与对策。

Satellite Telemetry,Tracking,and Command(TT&C)is an important means to ensure the normal operation of communication satellites.In order to accomplish the TT&C task of communication satellite,not only the cross coupling coefficient of the self-tracking system of the TT&C equipment of satellite ground station is required to meet the technical specification,but also the stability of its self-tracking state has to meet certain requirement.Through an analysis of the stability of self-tracking state,it is found that the change of the phase difference of the sum and difference channels will cause the change of the self-tracking cross coupling coefficient,and then change the stability of self-tracking state.Based on a further study of the causes of the phase change of the sum and difference channels,the influence of the change of sum and difference phases on the stability of self-tracking state is studied under different temperatures and different transmission cable lengths.The conclusion is that the sum/difference phase stability is closely related to the self-tracking stability,and the improvement measures and countermeasures are proposed.