Loosely Coupled GPS/INS System Based on Inter-Satellite Link in Urban Areas

Moonseok Choi, Jongsun Ahn, Sangkyung Sung, Jaegyu Jang, Young Jae Lee

Peer Reviewed

Abstract:	Generally, the availability and accuracy of GPS is significantly degraded in the areas where GPS visibility is poor, such as in urban areas. Low-cost GPS / INS loosely coupled navigation systems, which are highly affected by the GPS position accuracy, are less accurate in urban areas. This study proposes a technique to improve navigation performance of a loosely coupled navigation system in urban areas with weak GPS visibility. In addition an algorithm without any additional sensors or infrastructure, the proposed technique aims to improve the availability of GPS navigation solutions and the accuracy of the coupled system. The ISL-based position estimation technique applies the new measured values drawn from the two measured distance values of GPS pseudo-range and inter-satellite distance to the user location estimation method. With the proposed technique, it is possible to estimate a position even if there are three satellites. Therefore, in order to improve the position estimation accuracy and the availability of loosely coupled GPS/INS system, this study applied the ISL-based estimation technique and compared the outcome with the existing loosely coupled techniques for performance analysis. In particular, the performance of the loosely coupled system was analyzed in urban areas with very weak satellite visibility.
Published in:	Proceedings of the ION 2017 Pacific PNT Meeting May 1 - 4, 2017 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	757 - 766
Cite this article:	Choi, Moonseok, Ahn, Jongsun, Sung, Sangkyung, Jang, Jaegyu, Lee, Young Jae, "Loosely Coupled GPS/INS System Based on Inter-Satellite Link in Urban Areas," Proceedings of the ION 2017 Pacific PNT Meeting, Honolulu, Hawaii, May 2017, pp. 757-766. https://doi.org/10.33012/2017.15079
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