一种导航卫星频率控制量精密确定方法

A Method for High Accuracy Determination of Frequency Adjustment for Navigation Satellites

提出了一种通过提取导航卫星主备钟差信息进行卫星频率控制量精密确定的方法。在导航卫星的卫星钟发生器中,将主备份卫星钟之间的频率差以相位差的形式表示,作为卫星的监测信息,通过无线通道下行发射,地面接收机解调监测信息后,进行数据处理,获得卫星钟实时频率调整的变化量。与以往的方法相比,本文提出的方法简单,不需要时频测试设备,所确定的频率控制量的精度高,可以满足导航卫星工程需求。

This paper proposes a method for accurate determination of navigation satellite frequency adjustment through extraction of difference between prime and backup on-board clocks.The frequency difference in the clock generators of navigation satellites is represented in phase difference and downlinked as satellite monitoring information.A receiver on the ground demodulates the satellite monitoring information to obtain the frequency adjustment after digital signal processing.Compared to conventional methods,the proposed approach is simplified and no time/frequency test instrument is required.At the same time,the frequency adjustment determined has a higher accuracy and well meets requirements of navigation satellites.