Multipath detection with the combination of SNR measurements – Example from urban environment

• Autorzy: Špánik P. , Hefty J.

Identyfikatory

DOI

10.1515/geocart-2017-0020

• Języki publikacji: EN

Abstrakty

EN

Multipath is one of the most severe station-dependent error sources in both static and kinematic positioning. Relatively new and simple detection technique using the Signal-to-Noise (SNR) measurements on three frequencies will be presented based on idea of Strode and Groves. Exploitation of SNR measurements is benefi cial especially for their unambiguous character. Method is based on the fact that SNR values are closely linked with estimation of pseudo-ranges and phase measurements during signal correlation processing. Due to this connection, combination of SNR values can be used to detect anomalous behavior in received signal, however some kind of calibration in low multipath environment has to be done previously. In case of multipath, phase measurements on different frequencies will not be affected in the same manner. Specular multipath, e.g. from building wall introduces additional path delay which is interpreted differently on each of the used carrier, due to different wavelengths. Experimental results of multipath detection in urban environment will be presented. Originally proposed method is designed to work with three different frequencies in each epoch, thus only utilization of GPS Block II-F and Galileo satellites is possible. Simplification of detection statistics to use only two frequencies is made and results using GPS and GLONASS systems are presented along with results obtained using original formula.

Słowa kluczowe

EN

multipath; detection; SNR; three-frequency combination; GNSS positioning

PL

satelita nawigacyjny; fala radiowa; pomiar szumu

• Wydawca: Komitet Geodezji PAN
• Czasopismo: Geodesy and Cartography
• Rocznik: 2017
• Tom: Vol. 66, no. 2
• Strony: 305--315
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Špánik P.

• Slovak University of Technology in Bratislava Faculty of Civil Engineering Department of Theoretical Geodesy Radlinského 11, 810 05 Bratislava, Slovakia

autor

Hefty J.

• Slovak University of Technology in Bratislava Faculty of Civil Engineering Department of Theoretical Geodesy Radlinského 11, 810 05 Bratislava, Slovakia

Bibliografia

• [1] Global Positioning Systems Directorate System Engineering & Integration, Interface Control Document & Working Group. (2013). Interface Specification IS-GPS-200. Available online: www.gps.gov/technical/icwg/IS-GPS-200H.pdf.
• [2] Hofmann-Wellenhof, B., Lichtenegger H., and Wasle, L. (2008). GNSS - Global Navigation Satellite Systems. First edition. Springer-Verlag Wien. ISBN 978-3-211-73012-6.
• [3] Lau, L. and Cross, P. (2006). A New Signal-to-Noise-Ratio Based Stochastic Model for GNSS High-Precision Carrier Phase Data Processing Algorithms in the Presence of Multipath Errors. In: IONGNSS 2006. September 26-29 2006. Forth Worth, Texas.
• [4] Lau, L. and Cross, P. (2007). Development and testing of a new ray-tracing approach to GNSS carrierphase multipath modelling. Journal of Geodesy, 81, 713-732. DOI 10.1007/s00190-007-0139-z.
• [5] Luo, X. (2013). GPS Stochastic Modelling, Signal Quality Measures and ARMA Processes. DoctoralThesis. Karlsruhe Institute of Technology, Karlsruhe, Germany.
• [6] Richards, J.A. (2008). Radio Wave Propagation. An Introduction for the Non-Specialist. Springer-Verlag Berlin.
• [7] Rost, Ch. and Wanninger, L. (2009). Carrier phase multipath mitigation based on GNSS signal quality measurements. Journal of Applied Geodesy, 3, 1-8. DOI: 10.1515/JAG.2009.009.
• [8] Strode, P.R.R. and Groves, P.D. (2016). GNSS multipath detection using three-frequency signal-to-noise measurements. GPS Solutions, 20, 399-412. DOI: 10.1007/s10291-015-0449-1.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018)