简易在轨导航卫星钟长稳测试方法

Simple Measurement Technique of the Long-term Stability of On-board Clocks for Navigation Satellites

在导航卫星的卫星钟发生器中,按一定频度测量主备卫星钟之间相位差,并将该相位差值作为卫星钟的监测信息,通过无线通道下行发射.在提出的星载卫星钟长稳测试方法中,首先利用地面接收机解调卫星钟的监测信息,然后进行数据处理获得主备卫星钟之间的相位差样本值,最后通过计算得到卫星钟的长期稳定度特性参数.该方法克服了传统方法需要高精度地面时频参考和复杂测试设备的问题,实现了简单、快速,测量精度能满足测试要求.采用该方法对多个在轨导航卫星进行测试,测试结果与对应卫星钟发射前的地面测试结果一致,该测试方法能准确反映在轨导航卫星钟长期稳定度特性.

In satellite navigation satellite clock generator,the phase difference between the master and the slave satellite clocks is measured according to a certain frequency,and the phase difference is regarded as satellite clock monitoring information that is transmitted through a wireless downlink channel.For the proposed long stability test method of orbital satellite clock,satellite clock monitoring information is first demodulated by the ground the receiver; then,the sample values of the phase difference between the master and the slave satellite clock are finally obtained by data processing; the characteristic parameters of the long-term stability of the satellite clock can be finally calculated. The proposed method overcomes the problem of the traditional method requiring high-precision ground frequency reference and complex test equipment. The proposed method is simple and rapid,and the measurement accuracy meets the test requirements. Using the proposed method of multiple navigation satellite in-orbit testing,the test results agree with the results of ground tests before launch for the same satellite clock. The proposed method can accurately reflect the long-term stability characteristics of the navigation satellite orbital clock.