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Title: First preliminary fast static ambiguity resolution results of medium-baseline with triple-frequency Beidou wavebands
Authors: Ji, SY
Wang, XL
Xu, Y
Wang, ZJ
Chen, W 
Liu, H
Keywords: BeiDou
Ambiguity resolution
Medium- and long-distance baselines
Issue Date: 2014
Publisher: Cambridge University Press
Source: Journal of navigation, 2014, v. 67, no. 6, p. 1109-1119 How to cite?
Journal: Journal of navigation 
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 degrees is much better than that of 15 degrees; 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.
ISSN: 0373-4633
EISSN: 1469-7785
DOI: 10.1017/S0373463314000332
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