Browse > Article
http://dx.doi.org/10.5394/KINPR.2015.39.1.7

A Study on Analysis of Multipath Signal Detection using GPS Signal Strength Information  

Kim, Dusik (Graduate school of Inha University)
Park, Kwan-Dong (Department of Geoinformatic Engineering, Inha University)
Kim, Hye-In (Jipyong Space Inc.)
Tae, Hyunu (Graduate school of Inha University)
Publication Information
Journal of Navigation and Port Research / v.39, no.1, 2015 , pp. 7-13 More about this Journal
Abstract
The number of mobile terminals equipped with a GPS module is steadily increasing today. However, because they using code pseudorange measurements in positioning, the positioning accuracy of mobile terminals is lower than that of those receivers using carrier phases. Especially, the multipath signal causes more significant errors in code pseudoranges. Therefore, the techniques of multipath detection and elimination is necessary. In this study, as an initial analysis of multipath detection and elimination technique development, we tested the feasibility of multipath signal detection using GPS signal strength information. We found that the GPS signal strength increases as the elevation angle gets higher in the open-sky environment. Also, we found that the signal strength decreases when there were some signal reflectors nearby. We checked the repeatability of the signal strength variation characteristics by reflecting repeat time of GPS satellites. As a result, this characteristics repeats almost perfectly when GPS satellites pass the same orbit. Therefore, we found that it is not a temporary phenomenon and the multipath signal detection should be possible by using GPS signal strength information.
Keywords
GPS; multipath signal; signal strength; SNR; repeat time;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Agnew, D. C. and Larson, K. M.(2007), "Finding the repeat times of the GPS constellation", GPS Solutions, Vol. 11, pp. 71-76.
2 Choi, K., Bilich, A., Larson, K. M., and Axelrad, P.(2004), "Modified sidereal filtering: Implications for high-rate GPS positioning, Geophysical Research Letters", Vol. 31, L22608.   DOI   ScienceOn
3 GSA(2013), "GNSS Market Report", Issue 3, October 2013, p. 17.
4 Gurtner, W. and Estey L.(2007), "RINEX: The Receiver Independent Exchange Format Version 2.11", IGS/RTCM RINEX Working Group.
5 Lee, C.-M., Park, K.-D., Kim, H.-I. and Park, J.-M.(2009), "GPS Satellite Repeat Time Determination and Orbit Prediction Based on Ultra-rapid Orbits", Korean Journal of Geomatics, Vol. 27, No. 4, pp. 411-420.
6 Nee R. D. J. van(1992), "Multipath Effects on GPS Code Phase Measurements", Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), September 11 - 13, 1991, Albuquerque, NM, pp. 915 - 924.
7 Park, K.-D., Nerem, R. S., Schenewerk, M. S. and Davis, J. L. (2004), "Site-specific multipath characteristics of global IGS and CORS GPS sites", Journal of Geodesy, Vol. 77, No. 12, pp. 799-803.   DOI
8 Wells, D., Beck, N., Delikaraoglou, D., Kleusberg, A., Krakiwsky, E. J., Lachapelle, G., Langley, R. B., Nakiboglu, M., Schwarz, K.-P., Tranquilla, J. M. and Vanicek, P.(1987), Guide to GPS Positioning, Canadian GPS Associates, Fredericton.