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First Preliminary Fast Static Ambiguity Resolution Results of Medium-Baseline with Triple-Frequency Beidou Wavebands

Published online by Cambridge University Press:  28 May 2014

Shengyue Ji ,
Xiaolong Wang ,
Ying Xu ,
Zhenjie Wang ,
Wu Chen  and
Hui Liu
Shengyue Ji
Affiliation:
(China University of Petroleum, Qingdao, China) (The Hong Kong Polytechnic University, Hong Kong)
Xiaolong Wang
Affiliation:
(China University of Petroleum, Qingdao, China)
Ying Xu*
Affiliation:
(The Hong Kong Polytechnic University, Hong Kong)
Zhenjie Wang
Affiliation:
(China University of Petroleum, Qingdao, China)
Wu Chen
Affiliation:
(The Hong Kong Polytechnic University, Hong Kong)
Hui Liu
Affiliation:
(Wuhan University, Wuhan, China)
*
(E-mail: xu.xu@connect.polyu.hk)
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Abstract

Fast high precision relative Global Navigation Satellite System (GNSS) positioning is very important to various applications and ambiguity resolution is a key requirement. It has been a continuing challenge to determine and fix GNSS carrier-phase ambiguity, especially for medium- and long-distance baselines. In past research, with dual-frequency band Global Positioning System (GPS), it is almost impossible for fast ambiguity resolution of medium- and long-distance baselines mainly due to the ionospheric and tropospheric effects. With the launch of the BeiDou system, triple-frequency band GNSS observations are available for the first time. This research aims to test the ambiguity resolution performance with BeiDou triple-frequency band observations. In this research, two mathematical models are compared: zenith tropospheric delay as an unknown parameter versus corrected tropospheric delay. The ambiguity resolution performance is investigated in detail with BeiDou observations. Different distance baselines are tested: 45 km, 70 km and 100 km and the performances are investigated with different elevation cut-off angles. Also the performance with BeiDou alone and combined BeiDou and GPS are compared. Experimental results clearly show that with practical observations of triple-frequency bands, ambiguity of medium- or long-distance baselines can be fixed. The results also show that: the performance of ambiguity resolution with an elevation cutoff angle of 20° is much better than that of 15°; The performance with tropospheric effect corrected is slightly better than that with tropospheric effect as an estimated parameter; Dual-frequency band GPS observations will benefit ambiguity resolution of integrated BeiDou and GPS.

Keywords

BeiDouAmbiguity resolutionMedium- and long-distance baselinesIonosphereTroposphere
Type
Research Article
Information
The Journal of Navigation , Volume 67 , Issue 6 , November 2014 , pp. 1109 - 1119
Copyright
Copyright © The Royal Institute of Navigation 2014 

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