北斗广播星历偏差分析及改正

doi:10.11947/j.AGCS.2016.F027

测绘学报 ›› 2016, Vol. 45 ›› Issue (S2): 64-71.doi: 10.11947/j.AGCS.2016.F027

北斗广播星历偏差分析及改正

张益泽^1,2, 陈俊平^2,3, 周建华⁴, 杨赛男^2,3, 王彬², 陈倩^2,3, 巩秀强^2,3

1. 同济大学测绘与地理信息学院, 上海 200092;
2. 中国科学院上海天文台, 上海 200092;
3. 中国科学院大学, 北京 100049;
4. 北京卫星导航中心, 北京 100094

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: 周建华 E-mail:yishu-zhou@263.net
作者简介:张益泽(1990-),男,博士生,研究方向为GNSS精密定位。E-mail:zhyize@163.com
基金资助:
国家863计划（2014AA123102）；国家自然科学基金（11673050；11273046）

Analysis and Application of BDS Broadcast Ephemeris Bias

ZHANG Yize^1,2, CHEN Junping^2,3, ZHOU Jianhua⁴, YANG Sainan^2,3, WANG Bin², CHEN Qian^2,3, GONG Xiuqiang^2,3

1. College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China;
2. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200092, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Beijing Satellite Navigation Center, Beijing 100094, China

Received:2016-11-25 Revised:2016-12-20 Online:2017-05-20 Published:2017-05-20
Supported by:
The National High-tech Research and Development Program of China (863 Program) (No. 2014AA123102);The National Natural Science Foundation of China (Nos.11673050;11273046)

摘要/Abstract

摘要：

以后处理精密轨道钟差为参考，分析了2014年2月至2016年10月北斗广播星历误差及空间信号精度，分析结果表明，北斗广播星历存在偏差，最大超过2 m。在此基础上，基于广域差分改正数，采用18个MGEX站不同频点及频点组合连续97 d的数据对以上广播星历偏差进行了进一步验证。验证结果表明，不同卫星的伪距观测残差存在与广播星历偏差一致的系统性偏差。比较后处理给出的TGD和广播星历给出的TGD参数的偏差（dTGD），发现dTGD与基于广域差分参数的BEB的相关系数达到0.89，这表明经广域差分参数改正后的星历偏差可能是由广播电文中的TGD偏差造成。将北斗广播星历偏差改正到TGD参数上，分析对用户定位的影响。结果表明，经改正后，双频用户在N、E、U 3个方向单点定位精度分别提高14.9%、28.4%、15.5%，其定位残差也明显得到改善。

关键词: MGEX, 伪距残差, 广播星历偏差, 群延迟, 单点定位

Abstract:

We analyze the BeiDou broadcast ephemeris biases starting from February 2014 to October 2016 by using the IGS post-processed precise orbit and clock as references. Results show that the bias of BeiDou broadcast ephemeris can reach up to 2 meter. To further verify this finding, we perform precise point positioning for about 18 MGEX stations using BeiDou broadcast ephemeris and wide-area differential correction parameters. Data of 97 days are analyzed and pseudo-range residuals of each frequency for each station are derived. Systematic biases are found in the residuals using broadcast ephemeris. Comparing the BEB applying the differential correction parameters with the TGD difference between IGS and BeiDou broadcast ephemeris, we find that the correlation coefficient of TGD differences and BEB values could reach up to 0.89. This proves that the BEB applying the differential correction parameters is mainly due to the biases of the TGD parameters in broadcast ephemeris. By correcting the biases into TGD parameters, we performed point positioning at different stations. Results show that after applying the biases, the pseudo-range error reduces much, and the positioning precision can improve about 14.9%, 28.4%, 15.5% in N,E,U, direction for dual-frequency users, respectively.

Key words: MGEX, pseudo-range residual, broadcast ephemeris bias, TGD, point positioning

中图分类号:

P228

张益泽, 陈俊平, 周建华, 杨赛男, 王彬, 陈倩, 巩秀强. 北斗广播星历偏差分析及改正[J]. 测绘学报, 2016, 45(S2): 64-71.

ZHANG Yize, CHEN Junping, ZHOU Jianhua, YANG Sainan, WANG Bin, CHEN Qian, GONG Xiuqiang. Analysis and Application of BDS Broadcast Ephemeris Bias[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(S2): 64-71.

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北斗广播星历偏差分析及改正

Analysis and Application of BDS Broadcast Ephemeris Bias

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