| 基于高频观测值的不同GNSS卫星钟稳定性分析 |
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| 引用本文： | 李明哲,张绍成,胡友健,侯威震.基于高频观测值的不同GNSS卫星钟稳定性分析[J].武汉大学学报(信息科学版),2018,43(10):1490. |
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| 作者姓名： | 李明哲 张绍成 胡友健 侯威震 |
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| 作者单位： | 1.中国地质大学(武汉), 湖北 武汉, 430074 |
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| 基金项目： | 国家自然科学青-基金41504023大地测量与地球动力学国家重点实验室基金SKLGED2015-3-2-E中央高校基金新青-项目CUGL150839 |
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| 摘 要： | 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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| 关 键 词： | GNSS钟差 高频观测值 短期稳定性 阿伦方差 噪声识别 |
| 收稿时间： | 2017-04-14 |
Comparison of GNSS Satellite Clock Stability Based on High Frequency Observations |
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| Affiliation: | 1.China University of Geosciences, Wuhan 430074, China2.State Key Laboratory of Geodesy and Earth's Dynamics, Chinese Academy of Sciences, Wuhan 430074, China |
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| Abstract: | In GNSS high-precision applications, transmit satellite clock stability is one of the core fac-tors which can directly affect the data processing performance. In this paper, the short-term stabilities of GNSS clocks are investigated with 20 Hz dual-frequency ground-based observations. In date processing procedure, the receiver clock bias are removed with single difference between two satellites, and the night-time dual-frequency observations were used to form the ionosphere-free measurements to avoid the ionosphere delays. Thus, the troposphere delays are corrected with empirical model and mapping function for residual delays. The satellite clock bias are identified by Lag1 autocorrelation function, and the short-term stability of different GNSS satellite atomic clocks are analyzed with Allan deviation. The results show that the single-difference clock stability of GPS, GLONASS and BeiDou are almost on the same magnitude, which is about 10-10 degree on 0.05 second interval and 10-11 degree on 1 second interval. Thus, the single-different strategy can be validated for BeiDou radio occultation data processing. |
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