Evaluation of GNSS positioning accuracy from satellite-based augmentation systems in Thailand

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Published: Sep 23, 2021
Keywords:
GNSS SBAS SPAN GAGAN BDSBAS

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Phunsap Thari
Department of Survey Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand
Somchai Kriengkraiwasin
Department of Survey Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand
Chalermchon Satirapod
Department of Survey Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand

Abstract

Satellite Based Augmentation System (SBAS) provides correction message services as an additional system to navigation satellites. Several SBAS services exist in many regions and usually cover a large area. Although, Thailand is not geographically located within a center of SBAS service coverage, users in Thailand can still receive correction messages from some available systems. This study aims to evaluate the GNSS positioning accuracy with corrections from different operational SBAS systems; namely, SPAN, GAGAN and BDSBAS when its positioning strategy is Single Point Positioning (SPP). The positioning results are then compared with solutions from Precise Point Positioning (PPP) which are referred to as reference coordinates. GNSS observations in this study are taken from 40 GNSS Continuously Operating Reference Stations (CORS) operated by the Royal Thai Survey Department. Certain period observations; comprising of September 2019, December 2019, and April 2020, are selected into computations. This research shows that three SBASs could not significantly improve both horizontal and vertical positioning accuracy comparing with GPS Single Point Positioning solutions.

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How to Cite
Thari, P. ., Kriengkraiwasin, S. ., & Satirapod, C. . (2021). Evaluation of GNSS positioning accuracy from satellite-based augmentation systems in Thailand. Engineering and Applied Science Research, 49(2), 209–217. Retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/245627
Issue
Vol. 49 No. 2 (2022)
Section
ORIGINAL RESEARCH

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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