GNSS-Reflectometry: Techniques for Scatterometric Remote Sensing

P.J. Jales

Abstract:	The modernisation and introduction of new GNSS services presents an opportunity in remote sensing. The properties of the GNSS signals that were selected for their use in navigation also provide a set of properties that are highly suitable for remote sensing: world-wide coverage, wide-bandwidth ranging signals, with a predetermined structure. The principle of GNSS Re_ectometry is that the Earth's surface properties can be measured from the delay and distortion of a re_ected GNSS signal. One of the applications is the potential for remote sensing of ocean roughness for operational meteorology and storm warning. Various methods have been proposed for determining the ocean roughness, but there is currently insu_cient spaceborne data to validate the methods or create semi- empirical models. A new spaceborne instrument with _exible processing is needed for generating empirical models and validation. One proposed technique, called stare processing is ex- plored in this paper. This has a closer analogy to the more traditional radar scatterometers for determining ocean wind, such as SeaWinds on the QuikScat satellite. The scheme is presented along with the corrections required to extract radar scattering cross-section measurements from GNSS-R. The impact of this processing scheme on the instrument and the satellite platform are examined. In addition many of the receiver developments required for real-time in-orbit operation, such as geometric tracking and prediction of specular point location are veri_ed on data from the UK-DMC GNSS Re_ectometry experiment.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2761 - 2770
Cite this article:	Jales, P.J., "GNSS-Reflectometry: Techniques for Scatterometric Remote Sensing," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 2761-2770.
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