顾及轨道误差BDS/GPS实时钟差融合估计的观测权函数设计

谷守周; 施闯; 党亚民; 秘金钟; 薛树强; 张龙平

doi:10.11947/j.AGCS.2016.F024

测绘学报 >

2016 , Vol. 45 >Issue S2: 39 - 45

DOI: https://doi.org/10.11947/j.AGCS.2016.F024

论文

顾及轨道误差BDS/GPS实时钟差融合估计的观测权函数设计

谷守周 ,
施闯 ,
党亚民 ,
秘金钟 ,
薛树强 ,
张龙平

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1. 武汉大学卫星导航定位技术研究中心, 湖北武汉 430079;
2. 中国测绘科学研究院, 北京 100830;
3. 山东科技大学测绘科学与工程学院, 山东青岛 266590;
4. 长安大学地质工程与测绘学院, 陕西西安 710054

谷守周(1984-),男,硕士,助理研究员,研究方向为GNSS精密钟差估计与精密单点定位。E-mail:gusz@casm.ac.cn

收稿日期: 2016-11-25

修回日期: 2016-12-20

网络出版日期: 2017-05-20

基金资助

国家重点研发计划课题（2016YFB0501801；2016YFB0502105；2016YFB0501405）；全球连续监测评估系统项目（GFZX0301040308-06）；国家自然科学基金（41474011；41104018；41404034）；测绘行业公益性专项（B1503）；国家863计划项目（2015AA124001）；中国测绘科学研究院基本科研业务费（7771604）

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Observation Weight Function Design for Fusing BDS/GPS Data to Estimate the Real-time Clock with Regard to the Orbit Errors

GU Shouzhou ,
SHI Chuang ,
DANG Yamin ,
MI jinzhong ,
XUE Shuqiang ,
ZHANG Longping

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1. GNSS Research Center, Wuhan University, Wuhan 430079, China;
2. Chinese Academy of Surveying and Mapping, Beijing 100830, China;
3. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;
4. College of Geology Engineering and Geomantics, Chang'an University, Xi'an 710054, China

Received date: 2016-11-25

Revised date: 2016-12-20

Online published: 2017-05-20

Supported by

Key Project of China National Programs for Research and Development (Nos.2016YFB0501801;2016YFB0502105;2016YFB0501405);iGMAS(No.GFZX0301040308-06);The National Natural Science Foundation of China (Nos. 41474011;41104018;41404034);Special Research Grant for Surveying and Mapping Non-profit Public Service(No.B1503);The National High-tech Research and Development Program of China (863 Program) (No.2015AA124001);The Fundamental Research Funds for CASM(No.7771604)

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摘要

实时钟差产品是高精度广域差分位置服务（亚米级、分米级、厘米级）的基础产品，本文针对BDS/GPS轨道精度差异，设计了一种顾及轨道精度差异观测权函数，优化了实时钟差估计的随机模型，在此基础上基于非差法实现了BDS/GPS联合的实时钟差估计。采用MGEX和iGMAS跟踪站的实时观测数据进行实时钟差解算，并与iGMAS产品综合中心提供的事后精密钟差产品进行了比较分析。结果表明：基于该方法估计的钟差精度对单GPS、单BDS和BDS/GPS融合都有提高，其中BDS钟差精度整体较GPS更为显著，提高幅度约12.8%，其中IGSO/MEO更为突出，提高幅度约20%，验证了方法的有效性。

关键词： 精密钟差估计; 权函数设计; 非差; BDS/GPS; GNSS数据融合

本文引用格式

谷守周 , 施闯 , 党亚民 , 秘金钟 , 薛树强 , 张龙平 . 顾及轨道误差BDS/GPS实时钟差融合估计的观测权函数设计[J]. 测绘学报, 2016 , 45(S2) : 39 -45 . DOI: 10.11947/j.AGCS.2016.F024

Abstract

The real-time clock product is one of the basis products for wide-area positioning service of high precision. Considering the difference between BDS orbit precision and GPS precision, we design a new observation weight function, in order to optimize the stochastic model of real time BDS/GPS clock estimation. The BDS/GPS observations of 78 MGEX global stations and 2 iGMAS stations were collected to generate the real time clock, and then the calculation results were compared with the final iGMAS precise clock product in two strategies (the old stochastic model and the new stochastic model).It shows that the method based the proposed stochastic model can improve the precision of satellite clock about 9% for GPS and 10%for BDS.

Key words： precision clock estimation; weight function design; undifferenced; BDS/GPS; GNSS data fusion

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