| 接收机钟跳对单站GPS测速的影响及改正方法 |
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| 引用本文： | 郑凯,郭博峰,张小红.接收机钟跳对单站GPS测速的影响及改正方法[J].武汉大学学报(信息科学版),2017,42(3):304. |
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| 作者姓名： | 郑凯 郭博峰 张小红 |
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| 作者单位： | 1.武汉大学测绘学院, 湖北 武汉, 430079 |
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| 基金项目： | 中国地震局地震科技星火计划攻关项目XH16053国家教育部高等学校博士学科点专项科研基金20130141110001国家测绘地理信息局公益性行业科研专项201512002 |
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| 摘 要： | 分析了各类钟跳与时标、载波相位观测值之间的关系，给出了顾及各类钟跳的导出多普勒值构造方法。试验结果表明，30 s采样率的静态数据，钟跳对速度的影响可达cm/s级，而1 s采样率的静态数据，钟跳影响可达dm/s级；对于5 s采样率的动态车载数据，顾及钟跳影响的点位速度内符合精度为0.5 cm/s，而不顾及钟跳的情况下，精度达到了25 cm/s。
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| 关 键 词： | GPS 接收机钟跳 导出多普勒值 单站 测速 |
| 收稿时间： | 2016-06-13 |
Research of Clock Jump Effect on Velocity Estimation with a Single GPS Receiver |
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| Institution: | 1.School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China2.First Crust Monitoring and Application Center, China Earthqueak Administration, Tianjin 300180, China |
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| Abstract: | In this paper, we first analyze the influence of four types of clock jump categorized according to their impact on GNSS observables to time tag and carrier phase measurements. Then we make a comparison of two mainstream methods. The results indicate that, the precision of carrier-phase corrected method is mainly depended on the precision of carrier phase, while the precision of time-tags corrected method is mainly affected by clock jump value. Then, we make an in-depth discussion about time-tags corrected method for the four types clock jumps, and provide an unified formula to construct carrier-phase-derived Doppler measurements. The testing is conducted with static data from IGS stations and kinematic data collected by car campaign by using conventional method and the proposed method. The results show that, receiver velocity suffered significantly from clock jumps, and the impact on static velocity estimation reaches up to cm/s and dm/s for 30s sampling data and 1 s sampling data respectively, and the standard deviation reaches 25 cm/s for kinematic data. |
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