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简易在轨导航卫星钟长稳测试方法

Keywords: 导航卫星,卫星钟,频率稳定度

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Abstract:

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.

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