测绘通报 ›› 2019, Vol. 0 ›› Issue (5): 39-43,76.doi: 10.13474/j.cnki.11-2246.2019.0146

• 学术研究 • 上一篇    下一篇

基于非差观测量的BDS+GPS近实时钟差估计

郑涛1, 徐爱功1, 唐龙江1, 徐宗秋1,2, 杨虎1   

  1. 1. 辽宁工程技术大学测绘与地理科学学院, 辽宁 阜新 123000;
    2. 武汉大学卫星导航定位技术研究中心, 湖北 武汉 430079
  • 收稿日期:2018-07-09 出版日期:2019-05-25 发布日期:2019-06-04
  • 作者简介:郑涛(1982-),男,博士,主要从事精密工程测量、卫星导航与数据处理研究工作。E-mail:zhengtao210@126.com
  • 基金资助:

    国家青年基金(41504030;41601501);国家重点研发计划(2016YFC0803102);辽宁省科技厅博士启动基金(201501126)

Quasi real-time clock estimation of BDS+GPS with no-difference observation

ZHENG Tao1, XU Aigong1, TANG Longjiang1, XU Zongqiu1,2, YANG Hu1   

  1. 1. School of Geomatics of Liaoning Technical University, Fuxin 123000, China;
    2. Research Center of GNSS, Wuhan University, Wuhan 430079, China
  • Received:2018-07-09 Online:2019-05-25 Published:2019-06-04

摘要:

卫星钟差的难预测性是影响实时高精度定位的重要因素之一。为快速获得高精度位置或对流层等信息,在非差观测模型的基础上,本文提出了一种延迟量约1 h的近实时钟差估计策略,该策略主要包含超快速轨道解算和钟差估计两部分。经验证,预报部分第2~5 h的GPS轨道三维平均精度为3.85 cm,BDS GEO和IGSO+MEO轨道三维平均精度分别为81.4和21.74 cm。基于超快速轨道可获得近实时钟差精度GPS为0.054 ns,BDS为0.12 ns。最后通过BDS+GPS静态PPP试验验证了轨道和钟差的可用性。

关键词: 超快速轨道, 钟差, 近实时, BDS, GPS

Abstract:

The inscrutability of satellite clocks is one of the most important factors affecting real-time precise positioning. To obtain high accuracy position and zenith troposphere delay(ZTD) quickly, a strategy focusing on quasi real-time clock estimation delaying on hour is put forward. No-difference observation model is chosen during our procession. The proposed strategy consists of calculation of ultra-rapid orbits and estimation of clocks. Experiments show that average 3D RMS of 3 h prediction starting from 2 of GPS, BDS GEO and BDS IGSO+MEO are 3.85, 81.4 and 21.74 cm respectively. Precision of quasi real-time estimation of GPS clock based on ultra-rapid orbits is 0.054 ns and that of BDS clock is 0.12 ns. Finally, static PPP experiment ensures the availability of orbits and clocks.

Key words: ultra-rapid orbit, clock, quasi real-time, BDS, GPS

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