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A Multi-Station Troposphere Modelling Method Based on Error Compensation Considering the Influence of Height Factor

Published online by Cambridge University Press:  23 July 2020

Qing Zhao Open the ORCID record for Qing Zhao [Opens in a new window] ,
Shuguo Pan Open the ORCID record for Shuguo Pan [Opens in a new window] ,
Chengfa Gao ,
Longlei Qiao ,
Wang Gao ,
Ruicheng Zhang  and
Guoliang Liu
Qing Zhao
Affiliation:
(School of Transportation, Southeast University, Nanjing, China)
Shuguo Pan*
Affiliation:
(School of Instrument Science and Engineering, Southeast University, Nanjing, China) (Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology, Ministry of Education, Nanjing, China)
Chengfa Gao
Affiliation:
(School of Transportation, Southeast University, Nanjing, China)
Longlei Qiao
Affiliation:
(Nanjing Compass Navigation Technology Company Limited, Nanjing, China)
Wang Gao*
Affiliation:
(School of Instrument Science and Engineering, Southeast University, Nanjing, China) (Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology, Ministry of Education, Nanjing, China)
Ruicheng Zhang
Affiliation:
(School of Transportation, Southeast University, Nanjing, China)
Guoliang Liu
Affiliation:
(School of Instrument Science and Engineering, Southeast University, Nanjing, China) (Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology, Ministry of Education, Nanjing, China)
*
(E-mail: psg@seu.edu.cn; gaochfa@seu.edu.cn)
(E-mail: psg@seu.edu.cn; gaochfa@seu.edu.cn)
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Abstract

One critical issue in network real-time kinematic (NRTK) is the interpolation of atmospheric delay for user stations. Some classic interpolation algorithms, such as linear interpolation method (LIM), ignore the strong correlation between tropospheric delay and height factors, and the interpolation accuracy is poor in areas with large height difference. To solve this problem, a troposphere modelling method based on error compensation, namely ECDIM (Error Compensation-Based DIM), is proposed, and this method can be applied to both conventional single Delaunay triangulated network (DTN) and multi-station scenarios. The results of California Real Time Network (CRTN) with large height difference show that compared with LIM, the overall modelling accuracy with ECDIM has been improved by 50.1% to 67.3%, and especially for low elevation satellites (e.g., 10–20 degree), the accuracy is increased from tens of centimetres to a few centimetres. At user end, the positioning error in up direction with LIM has an obvious systematic deviation, and the fix rate of epoch is relatively low. This situation has been improved significantly after using ECDIM. The results of Tianjin Continuously Operating Reference System (TJCORS) show that in areas with small height difference, both methods have achieved high precision interpolation accuracy, and the positioning accuracy with ECDIM in up direction is improved by 21.2% compared with LIM.

Keywords

Network Real-Time Kinematic (NRTK)Troposphere ModellingError CompensationMulti-StationHeight FactorPositioning Accuracy
Type
Research Article
Information
The Journal of Navigation , Volume 74 , Issue 1 , January 2021 , pp. 38 - 59
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Copyright
Copyright © The Royal Institute of Navigation 2020

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