A Ray-Tracing Technique to Characterize GPS Multipath in the Frequency Domain. (28th September 2015)

• Record Type: Journal Article
• Authors: Gowdayyanadoddi, Naveen S.; Curran, James T.; Broumandan, Ali; Lachapelle, Gérard
• Other Names: Akopian David Academic Editor.
• Is Part Of: International journal of navigation and observation. Volume 2015(2015)
• Publication Date: 2015-09-28
• Subjects: Navigation -- Periodicals; Remote sensing -- Periodicals; Geographic information systems -- Periodicals; Global Positioning System -- Periodicals; Earth sciences -- Periodicals; Environmental monitoring -- Periodicals; Navigation; Télédétection; Systèmes d'information géographique; GPS; Sciences de la terre; Environnement -- Surveillance; Earth sciences; Environmental monitoring; Geographic information systems; Global Positioning System; Navigation; Remote sensing; Periodicals; Electronic journals; 629.045
• DOI: 10.1155/2015/983124
• Languages: English
• ISSNs: 1687-5990

Abstract

Abstract : Multipath propagation is one of the major sources of error in GPS measurements. In this research, a ray-tracing technique is proposed to study the frequency domain characteristics of multipath propagation. The Doppler frequency difference, also known as multipath phase rate and fading frequency, between direct (line-of-sight, LOS) and reflected (non-line-of-sight, NLOS) signals is studied as a function of satellite elevation and azimuth, as well as distance between the reflector and the static receiver. The accuracy of the method is verified with measured Doppler differences from real data collected in a downtown environment. The use of ray-tracing derived predicted Doppler differences in a receiver, as a means of alleviating the multipath induced errors in the measurement, is presented and discussed.