A Multi-Station Troposphere Modelling Method Based on Error Compensation Considering the Influence of Height Factor. (23rd January 2021)

• Record Type: Journal Article
• Authors: Zhao, Qing; Pan, Shuguo; Gao, Chengfa; Qiao, Longlei; Gao, Wang; Zhang, Ruicheng; Liu, Guoliang
• Is Part Of: Journal of navigation. Volume 74:Number 1(2021)
• Page Start: 38
• Page End: 59
• Publication Date: 2021-01-23
• Subjects: Network Real-Time Kinematic (NRTK), -- Troposphere Modelling, -- Error Compensation, -- Multi-Station, -- Height Factor, -- Positioning Accuracy; Navigation -- Periodicals; 623.8905
• DOI: 10.1017/S037346332000034X
• Languages: English
• ISSNs: 0373-4633

Abstract

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.