厘米级扩频测距系统自校准链路分析

摘要

With the performance development of remote sensing satellite systems and navigation satellite systems,the demand on TT&C ranging precision is improved from meter⁃level to centimeter⁃level.The range zero value calibration methods usually used in TT&C are introduced briefly,and the variation of range zero value introduced by antenna and analog channel equipment is analyzed quantita⁃tively.And it is concluded that real⁃time self⁃calibration links should be introduced.For DSSS ranging systems,the signal form and signal level of self⁃calibration links are discussed.The conclusion is that a self⁃calibration signal level 10 dB lower than the working signal is a better choice.%针对未来遥感、导航等卫星对地面测控设备的距离测量精度由米级提高到厘米级这一问题，简要介绍了航天测控常用的距离零值标校方案，并量化分析了天线和模拟信道设备引入的距离零值变化，认为必须引入与工作链路同时工作的距离零值自校准链路。针对扩频测距系统对自校准链路的信号形式进行了讨论，并对工作信号电平与自校准链路信号电平之间的相互影响进行了理论分析及仿真，认为自校准链路信号电平低于工作信号电平10 dB是一个较优的选择。