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Sensors 2015, 15(7), 17329-17349; doi:10.3390/s150717329

NLOS Correction/Exclusion for GNSS Measurement Using RAIM and City Building Models

Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 19 May 2015 / Revised: 17 June 2015 / Accepted: 9 July 2015 / Published: 17 July 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [5257 KB, uploaded 17 July 2015]   |  

Abstract

Currently, global navigation satellite system (GNSS) receivers can provide accurate and reliable positioning service in open-field areas. However, their performance in the downtown areas of cities is still affected by the multipath and none-line-of-sight (NLOS) receptions. This paper proposes a new positioning method using 3D building models and the receiver autonomous integrity monitoring (RAIM) satellite selection method to achieve satisfactory positioning performance in urban area. The 3D building model uses a ray-tracing technique to simulate the line-of-sight (LOS) and NLOS signal travel distance, which is well-known as pseudorange, between the satellite and receiver. The proposed RAIM fault detection and exclusion (FDE) is able to compare the similarity between the raw pseudorange measurement and the simulated pseudorange. The measurement of the satellite will be excluded if the simulated and raw pseudoranges are inconsistent. Because of the assumption of the single reflection in the ray-tracing technique, an inconsistent case indicates it is a double or multiple reflected NLOS signal. According to the experimental results, the RAIM satellite selection technique can reduce by about 8.4% and 36.2% the positioning solutions with large errors (solutions estimated on the wrong side of the road) for the 3D building model method in the middle and deep urban canyon environment, respectively. View Full-Text
Keywords: GNSS; GPS; NLOS; multipath; RAIM; 3D maps; building models; urban canyon; consistency check; particle filter GNSS; GPS; NLOS; multipath; RAIM; 3D maps; building models; urban canyon; consistency check; particle filter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hsu, L.-T.; Gu, Y.; Kamijo, S. NLOS Correction/Exclusion for GNSS Measurement Using RAIM and City Building Models. Sensors 2015, 15, 17329-17349.

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