A Ray-Tracing Technique to Characterize GPS Multipath in the Frequency Domain | Zendy

Naveen S. Gowdayyanadoddi | Zendy; James T. Curran | Zendy; Ali Broumandan | Zendy; Gérard Lachapelle | Zendy

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A Ray-Tracing Technique to Characterize GPS Multipath in the Frequency Domain

Author(s) -

Naveen S. Gowdayyanadoddi,

James T. Curran,

Ali Broumandan,

Gérard Lachapelle

Publication year - 2015

Publication title -

international journal of navigation and observation

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.176

H-Index - 18

eISSN - 1687-6008

pISSN - 1687-5990

DOI - 10.1155/2015/983124

Subject(s) - multipath propagation , non line of sight propagation , ray tracing (physics) , doppler effect , delay spread , global positioning system , frequency domain , elevation (ballistics) , computer science , azimuth , remote sensing , acoustics , optics , physics , telecommunications , geology , channel (broadcasting) , wireless , astronomy , computer vision

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

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