First preliminary fast static ambiguity resolution results of medium-baseline with triple-frequency beidou wavebands

Shengyue Ji, Xiaolong Wang, Ying Xu, Zhenjie Wang, Wu Chen, Hui Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


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.
Original languageEnglish
JournalJournal of Navigation
Issue number3
Publication statusPublished - 1 Jan 2014


  • Ambiguity resolution
  • BeiDou
  • Ionosphere
  • Medium- and long-distance baselines
  • Troposphere

ASJC Scopus subject areas

  • Oceanography
  • Ocean Engineering


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