CNMC方法改进北斗/伪卫星协同定位精度分析

符京杨; 周建华; 李广云

doi:10.11947/j.AGCS.2016.F041

测绘学报 >

2016 , Vol. 45 >Issue S2: 188 - 193

DOI: https://doi.org/10.11947/j.AGCS.2016.F041

论文

CNMC方法改进北斗/伪卫星协同定位精度分析

符京杨 ,
周建华 ,
李广云

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1. 信息工程大学导航与空天目标工程学院, 河南郑州 450001;
2. 北京卫星导航中心, 北京 100094

符京杨(1986-),博士生,研究方向为北斗地基增强技术。E-mail:fjynoob@sina.com

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863计划（2013AA122403）；国家自然科学基金（41274014；41501491）

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The Positioning Performance Analysis of BeiDou/Pseudolites Collaboration by CNMC Method

FU Jingyang ,
ZHOU Jianhua ,
LI Guangyun

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1. Information Engineering University, Zhengzhou 450001, China;
2. Beijing Satellite Navigation Center, Beijing 100094, China

Received date: 2016-11-25

Revised date: 2016-12-20

Online published: 2017-05-20

Supported by

The National High-tech Research and Development Program of China (863 Program)(No.2013AA122403);The National Natural Science Foundation of China (Nos.41274014;41501491)

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摘要

目前北斗卫星导航系统在轨卫星数量有限，在山坳及高楼林立的“城市峡谷”等特殊环境中，卫星信号易受遮挡造成用户定位精度降低或中断用户定位的连续性，通过加入伪卫星可有效减弱用户可见北斗卫星数目不足的问题。在北斗卫星和伪卫星协同定位中，需要正确处理北斗卫星和伪卫星伪距观测值中的多路径，以获取更好的定位精度。目前CNMC方法可有效减弱北斗卫星伪距观测值中的多路径影响，但由于信号传播路径不同所导致的观测误差特性不同，该方法不能直接应用于伪卫星的伪距数据处理中。针对伪卫星多路径处理问题，本文对CNMC方法进行了改进。在实际伪卫星试验场中进行了北斗/伪卫星动态协同定位试验，结果表明：使用CNMC方法对北斗卫星和地面伪卫星的伪距观测值处理后，三维定位精度由2.326 m改进到了1.936 m，定位稳定性也得到提升。

关键词： 北斗系统; 伪卫星; 多路径; CNMC; 定位性能

本文引用格式

符京杨 , 周建华 , 李广云 . CNMC方法改进北斗/伪卫星协同定位精度分析[J]. 测绘学报, 2016 , 45(S2) : 188 -193 . DOI: 10.11947/j.AGCS.2016.F041

Abstract

At present, the number of orbit satellites is limited for the Beidou satellite navigation system. In special terrain like “city Canyon” and other special circumstances, the signal of Beidou is easy to be blocked, which reduces positioning accuracy or interrupts positioning continuity of users. Joining pseudolites can effectively solve the problem of the insufficient number of BeiDou satellites visible to users. During cooperative positioning of Beidou satellites and pseudolites, the multi-path problem in pseudo-range observation values of the BeiDou satellite and the pseudolite shall be properly handled to obtain better positioning accuracy. The CNMC method (Code Noise and Multi-path Correction) can effectively reduce the multi-path effect of the BeiDou satellite's pseudo-range observation value, but cannot be applied directly to pseudo-range data processing of the pseudolite due to different observation error characteristics caused by different signal propagation paths. To solve the multi-path processing problem of pseudolites, the CNMC method is improved in this paper. The BeiDou/Pseudolite dynamic cooperative positioning experiments were conducted in the actual field of pseudolites. The test results show that the three-dimensional positioning accuracy is increased from 2.326 m to 1.936 m with enhanced positioning stability after pseudo-range observation values of the BeiDou satellite and the ground pseudolite are processed by the CNMC method.

Key words： BeiDou system; pseudolites; multi-path; CNMC; positioning performance

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