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Journal of Applied Geodesy

Editor-in-Chief: Kahmen, Heribert / Rizos, Chris

CiteScore 2018: 1.61

SCImago Journal Rank (SJR) 2018: 0.532
Source Normalized Impact per Paper (SNIP) 2018: 1.064

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Volume 13, Issue 1


Accounting for the differential inter-system bias (DISB) of code observation in GPS+BDS positioning

Xiang Cao
  • School of Instrument Science and Engineering, 12579 Southeast University, Nanjing 210096, China
  • Nanjing Institute of Measurement and Testing Technology, Nanjing 210049, China
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/ Qing Wang
  • Corresponding author
  • School of Instrument Science and Engineering, 12579 Southeast University, Nanjing 210096, China
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/ Chengfa Gao / Jie Zhang
Published Online: 2018-08-30 | DOI: https://doi.org/10.1515/jag-2018-0025


If the associated differential inter-system biases (DISBs) are priori known, only one common reference satellite is sufficient, which is called the inter-system model. The inter-system model can help to maximize the redundancy of the positioning model, and thus can improve the positioning performance, especially in harsh environment. However, in practice use not all receivers can be calibrated with DISBs in advance. In this paper, taking combined GPS and BDS pseudorange positioning as the example, we compare three positioning models and their positioning performance. One is traditional intra-system model, and the other two belongs to the inter-system models, i. e. the model with calibration of DISB and the model with real-time estimation of DISB parameter. Positioning performance using the three models is evaluated with simulated obstructed environments. It will be shown that besides the model with calibration of DISB, the model with real-time estimation of DISB parameter can also effectively improve positioning accuracy and reliability compared with the traditional intra-system model, especially for the severely obstructed environment with only a few satellites observed. When no more than 7 satellites visible, the positioning accuracies in each directions can be improved by no less than 15 %. The proposed model can be used alternatively when no priori DISB calibration is available.

Keywords: GPS+BDS; Differential inter-system biases (DISBs); Real-time estimation; Pseudorange positioning


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About the article

Received: 2018-07-09

Accepted: 2018-08-14

Published Online: 2018-08-30

Published in Print: 2019-01-28

Funding Source: National Natural Science Foundation of China

Award identifier / Grant number: 41574026

Funding Source: Government of Jiangsu Province

Award identifier / Grant number: BE2016176

This work is partially supported by the National Natural Science Foundation of China (Grant No. 41574026) and the Primary Research and Development Plan of Jiangsu Province (Grant No. BE2016176).

Citation Information: Journal of Applied Geodesy, Volume 13, Issue 1, Pages 63–68, ISSN (Online) 1862-9024, ISSN (Print) 1862-9016, DOI: https://doi.org/10.1515/jag-2018-0025.

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