Performance Analysis of Orbit and Clock Correction of Wide Area Differential Regional Navigation Satellite System

Jaeuk Park, Bu-Gyeom Kim and Changdon Kee, Donguk Kim

Abstract: The positioning accuracy of navigation satellite system (NSS) is largely influenced by the quality of ephemeris and clock information of NSS satellites in its navigation message. These orbit and clock information are generated through orbit determination and prediction in the ground segment of the NSS which utilizes NSS measurements from monitor stations. As the geometry of these monitor stations and NSS satellites influence the estimation performance, it is difficult to assure high positioning accuracy with monitor stations concentrated in narrow region. However, when considering regional navigation satellite system (RNSS) which seeks to provide service in regional area with satellites in inclined geosynchronous orbit (IGSO) or geostationary orbit (GEO), the network of monitor station gets smaller compared to that of global navigation satellite system (GNSS). Furthermore, monitor stations should be distributed in even narrower area due to system independence issue in some cases, leading to degradation of quality of navigation message. To cope with this, we revisited the concept of wide area differential GNSS (WAD-GNSS) which provides satellite ephemeris and clock correction generated by measurements from reference stations. Unlike WAD-GNSS broadcasting these corrections through GEO satellites, we expanded the concept to wide area differential RNSS (WAD-RNSS) where RNSS satellites broadcast orbit and clock correction along with basic navigation message so that users can enhance their positioning accuracy. As a preliminary study, we evaluated the performance of orbit and clock correction of fictitious WAD-RNSS for region around Korea by simulation using minimum variance estimator which is suitable for narrow network. As a result, we found that WAD-RNSS can improve signal in space user range error by 90% and positioning accuracy from over 10 m to 1 m for narrow network in Korea. From these results, we confirmed the possibility that WAD-RNSS can provide 1 m-level positioning only with the narrow network.
Published in: Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023)
September 11 - 15, 2023
Hyatt Regency Denver
Denver, Colorado
Pages: 1750 - 1764
Cite this article: Park, Jaeuk, Kim, Bu-Gyeom, Kee, Changdon, Kim, Donguk, "Performance Analysis of Orbit and Clock Correction of Wide Area Differential Regional Navigation Satellite System," Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023), Denver, Colorado, September 2023, pp. 1750-1764. https://doi.org/10.33012/2023.19278
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