Ms. Ka Bian Profile

Ka Bian

at Univ of Surrey

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Proceedings Article | 13 October 2006 Paper

Modelling and data analysis of GPS reflections from low earth orbit

Ka Bian, Alexandre Pechev, Stephen Mackin

Proceedings Volume 6360, 63600K (2006) https://doi.org/10.1117/12.689891

KEYWORDS: Global Positioning System, Reflection, Satellites, Doppler effect, Data modeling, Receivers, Modeling, Signal processing, Scatterometry, Signal to noise ratio

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GPS-Reflectometry studies the forward scattering of GPS reflections for the purposes of determining surface characteristics. This can be used for measuring sea states, soil humidity and polar ice age. Theoretical and experimental studies have been mainly carried out on ground and airborne platforms. A space-borne platform, however, would provide broader spatial and temporal coverage for Earth Observation and disaster monitoring. Currently UK-DMC represents the only Low Earth Orbit (LEO) satellite able to routinely schedule GPS reflection observations from ocean surfaces. Earlier research work has shown that Delay-Doppler Maps (DDMs) derived from reflections from space, although weak, will vary with geometry and sea state. In this work we extend these results by developing a modelling technique that derives relationships between wind conditions, sea roughness and GPS reflections received from a LEO satellite. We present simulation results and two-dimensional fitting of experimental data to compare DDMs. A novel technique is also proposed for reversing experimental DDMs obtained from GPS-R back to spatial energy maps. Preliminary data inversion results have been included to demonstrate the feasibility of this new methodology.

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