Analysis of GPS reflected signals based on SNR measurements : land versus water
Lighari, Rameez UR Rahman; Salonen, Erkki T.; Berg, Markus; Pärssinen, Aarno (2018-12-10)
R. U. R. R. Lighari, E. T. Salonen, M. Berg and A. Pärssinen, "Analysis of GPS reflected signals based on SNR measurements: Land versus water," 12th European Conference on Antennas and Propagation (EuCAP 2018), London, 2018, pp. 1-5. doi: 10.1049/cp.2018.1239
© 2018 The Authors and IET. This paper is a postprint of a paper submitted to and accepted for publication in [journal] and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at the IET Digital Library.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe201901081669
Tiivistelmä
Abstract
The transmitted Global Positioning System (GPS) signal has Right Hand Circular Polarization (RHCP) and it changes to Left Hand Circular Polarization (LHCP) after being reflected. The proportions of RHCP and LHCP power levels depend on characteristics of reflecting surface and satellite elevation angle. The change of polarization can be evaluated by comparing the measured RHCP and LHCP levels. This paper reports the results of Signal-to-Noise Ratio (SNR) data for direct and reflected GPS signal components measured over sea and land surfaces. First, field measurements with two dual polarized antennas having both RHCP and LHCP are performed in both environments. Then, SNR-based analysis is done to compare reflection levels between two reflecting surfaces. The results show that the SNR of reflected signal from seawater is on average 2 dB or more higher than that of signal reflected from asphalt or ground.
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