| 基于RT-PPP的低轨卫星实时高精度时间同步方法 |
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| 引用本文： | 王伟,臧文驰,彭竞,龚航,孙广富.基于RT-PPP的低轨卫星实时高精度时间同步方法[J].全球定位系统,2021,46(5):26-32. |
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| 作者姓名： | 王伟 臧文驰 彭竞 龚航 孙广富 |
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| 作者单位： | 国防科技大学 电子科学学院，长沙 410073 |
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| 基金项目： | 国家部委资助项目（2019-JCJQ-JJ-190） |
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| 摘 要： | 实现低轨导航增强的关键前提是实现低轨星座的整网时间同步，本文针对低轨导航增强系统，提出了一种基于实时精密单点定位(RT-PPP)的低轨卫星高精度时间同步方法，以解决低轨星座实时高精度时间同步的问题. 本文分析了在处理过程中存在的各类误差，介绍了低轨卫星采用状态空间(SSR)改正信息通过精密单点定位(PPP)实现实时高精度时间同步方法的处理流程，将此方法应用于气象、电离层与气候星座观测系统(COSMIC)卫星实测数据的处理，并将该方法与采用广播星历伪距的方法以及事后精密星历的方法进行了比较分析. 结果表明:采用SSR改正信息PPP的方式对2颗COSMIC卫星进行GPS双频观测值的解算，得到的轨道误差的标准差在分米级，钟差误差标准差分别在2.4 ns和2.3 ns左右，可以达到纳秒级. 通过对不同方法解算的结果进行比较可以看出，采用SSR改正信息PPP的方法明显优于采用广播星历伪距方法的解算精度，且与事后精密星历PPP的方法解算精度相当.
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| 关 键 词： | 低轨导航增强 时间同步 精密单点定位(PPP) 电离层与气候星座观测系统(COSMIC)卫星 状态空间(SSR)改正信息 |
| 收稿时间： | 2021-04-15 |
Real time and high precision time synchronization method of LEO satellite based on RT-PPP |
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| Institution: | College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | The key premise of the low orbit navigation enhancement is to realize the whole network time synchronization of the low earth orbit (LEO) constellation. In order to solve the problem of real-time and high-precision time synchronization of LEO constellation, a high-precision time synchronization method based on real-time precise point positioning (RT-PPP) is proposed for LEO navigation augmentation system. This paper analyzes all kinds of errors in the process of processing, introduces the processing flow of real-time and high-precision time synchronization method of LEO satellite using state space representation (SSR) correction information and precise point positioning, and applies this method to the processing of measured data of constellation observing system for meteorology, ionosphere and climate (COSMIC) satellites. The results show that the standard deviation of orbit error is in decimeter level, and the standard deviation of clock error is about 2.4 ns and 2.3 ns respectively, which can reach nanosecond level. By comparing the results of different methods, it can be seen that the PPP method using SSR correction information is obviously better than the pseudorange method using broadcast ephemeris, and the accuracy is equivalent to the PPP method using post precise ephemeris. |
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