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Nowak Adrian, Zajdel Radosław, Sośnica Krzysztof

Geodeta : magazyn geoinformacyjny

2022

nr 7

34--38

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

Špánik P., Hefty J.

Geodesy and Cartography

2017

Vol. 66, no. 2

305--315

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.

O systemie GPS i analitycznej metodzie rozwiązywania charakterystycznego dla niego układu czterech równań nieliniowych

Rosłoniec S.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

2013

nr 4

104--110

Omówiono strukturę organizacyjną i zasadę działania nawigacyjnego systemu GPS. Sformułowany dla tego systemu układ czterech równań nieliniowych rozwiązano analitycznie. Słuszność wyprowadzonych zależności matematycznych potwierdzono wynikami obliczeń symulacyjnych ilustrujących typowe zadania nawigacyjne.

An organizational structure and principle of operation of the Global Positioning System are described. The set of four pseudo-ranging equations is formulated and solved analytically. For this purpose the method of quadrilateration has beeen used.The validity of all mathematical formulas derived in Section 3 has been confirmed by the results of numerous computer simulations concerning the typical navigation problems.