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- 2018
基于高频观测值的不同GNSS卫星钟稳定性分析
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Abstract:
在GNSS高精度数据处理中，卫星钟差往往是决定结果精度的核心因素之一。采用20 Hz的双频观测数据对GNSS星载原子钟0.05~100 s平滑时间下的短期稳定性进行分析，通过星间单差的方法消除接收机钟差，采用无电离层组合及夜间观测避免电离层高阶项短期变化的影响，同时采用经验模型和映射函数来进行对流层延迟改正。通过Lag 1自相关函数分析了影响GNSS卫星钟稳定性的主要噪声类型，并使用阿伦方差计算分析GPS、GLONASS及BDS各自系统内不同卫星组合之间的钟差。结果表明，GPS、GLONASS及BDS系统钟差稳定性0.05秒稳均可达到10-10量级，秒稳可达10-11量级。可以认定，GPS、GLONASS及BDS在短期内的稳定性量级相当，从而验证了基于星间单差的BDS掩星数据处理方案的可行性
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