GNSS增强系统中精密实时钟差高频估计及应用研究

doi:10.11947/j.AGCS.2016.F021

测绘学报 ›› 2016, Vol. 45 ›› Issue (S2): 12-21.doi: 10.11947/j.AGCS.2016.F021

GNSS增强系统中精密实时钟差高频估计及应用研究

陈良^1,2, 胡志刚³, 耿长江^1,2, 葛茂荣⁴

1. 中国航天电子技术研究院卫星导航系统工程中心, 北京 100094;
2. 中国卫星导航系统管理办公室测试评估研究中心, 北京 100094;
3. 武汉大学卫星导航定位技术研究中心, 武汉 430079;
4. 德国地学研究中心, 14473 波茨坦德国

收稿日期:2016-11-25 修回日期:2016-12-20 出版日期:2017-05-20 发布日期:2017-05-20
通讯作者: 胡志刚 E-mail:Zhigang.hu@whu.edu.cn
作者简介:陈良(1988-),男,工程师,研究方向为GNSS广域增强、精密数据处理与导航卫星测试评估。E-mail:sdkdchenliang@163.com
基金资助:
国家自然科学基金青年科学基金（41604029）；国家留学基金航天国际化创新型人才培养项目（[2015]5138）

Study on a High-frequency Multi-GNSS Real-time Precise Clock Estimation Algorithm and Application in GNSS Augment System

CHEN Liang^1,2, HU Zhigang³, GENG Changjiang^1,2, GE Maorong⁴

1. GNSS System Engineering Center, China Academy of Aerospace Electronics Technology, Beijing 100094, China;
2. Test and Assessment Research Center, China Satellite Navigation Office, Beijing 100094, China;
3. Research Center of Positioning and Navigation Technology, Wuhan University, Wuhan 430079, China;
4. Helmholtz Centre Potsdam, German Research Centre for Geosciences(GFZ), Telegrafenberg, 14473 Potsdam, Germany

Received:2016-11-25 Revised:2016-12-20 Online:2017-05-20 Published:2017-05-20
Supported by:
The National Nature Science Foundation of China(No.41604029);State Scholarship Fund for International Innovative Aerospace Talent Project (No.[2015]5138)

摘要/Abstract

摘要：

GNSS星基差分增强系统依赖于实时轨道及钟差增强信息。本文主要研究多GNSS实时精密钟差估计模型，在传统非差基础上优化待估参数，实现了一种高效的Multi-GNSS实时钟差简化估计模型。基于PANDA软件开展了实时轨道数据处理与分析，经过验证可获得的GPS/北斗MEO/Galileo实时轨道径向精度1~5 cm，北斗GEO/IGSO卫星径向精度约10 cm。分析发现本文优化的实时钟差简化估计模型单历元解算效率较高，可应用于实时钟差增强信息高频（如1 Hz）更新，且解算获得的实时钟差不存在常偏为绝对钟差；基于实时轨道，通过该模型可获得实时钟差精度GPS约0.22 ns，北斗GEO约0.50 ns、IGSO/MEO约0.24 ns，Galileo约0.32 ns。在此基础上，利用目前所获取的Multi-GNSS实时数据流搭建了Multi-GNSS全球实时增强原型系统，并基于互联网实时播发增强信息，可初步实现实时PPP厘米级服务、伪距米级导航定位服务。

关键词: GPS, 北斗, Galileo, 实时钟差, 高频估计模型, 实时增强系统, 实时PPP

Abstract:

GNSS satellite-based differential augment system is based on real-time orbit and clock augment message. The multi-GNSS real-time precise clock error estimation model is studied, and then the parameters estimated in traditional un-difference model are optimized and a high-efficient real-time clock simplified model is proposed and realized. The real-time orbit data processing based on PANDA is also analyzed. The results indicate that the real-time orbit radial accuracy of GPS, BeiDou MEO and Galileo is 1~5 cm, and the radial accuracy of the BeiDou GEO/IGSO satellite is about 10 cm. It is found that the optimized real-time clock simplified model is more efficient in one epoch than un-difference model and can be applied to high-frequency (such as 1 Hz) updating of real-time clock augment message. The results show that the real-time clock error obtained by this model is absolute value and there is no constant bias. Based on the real-time orbit, the GPS real-time clock precision of the simplified model is about 0.24 ns, BeiDou GEO is about 0.50 ns, IGSO/MEO is about 0.22 ns and Galileo is about 0.32 ns. Using the multi-GNSS real-time data stream in GFZ, a multi-GNSS real-time augment prototype system is built and the real-time augment message is being broadcasted on the Internet. The real-time PPP centimeter-level service and meter-level navigation service based on pseudorange are realized based on this prototype system.

Key words: GPS, BeiDou, Galileo, real-time clock bias, high-frequency estimation model, real-time augment system, real-time PPP

中图分类号:

P228

陈良, 胡志刚, 耿长江, 葛茂荣. GNSS增强系统中精密实时钟差高频估计及应用研究[J]. 测绘学报, 2016, 45(S2): 12-21.

CHEN Liang, HU Zhigang, GENG Changjiang, GE Maorong. Study on a High-frequency Multi-GNSS Real-time Precise Clock Estimation Algorithm and Application in GNSS Augment System[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(S2): 12-21.

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GNSS增强系统中精密实时钟差高频估计及应用研究

Study on a High-frequency Multi-GNSS Real-time Precise Clock Estimation Algorithm and Application in GNSS Augment System

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