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PIER PIER B PIER C PIER M PIER Letters
2021-02-05
A Fine Scale Partially Coherent Patch Model Including Topographical Effects for GNSS-R DDM Simulations
By
Haokui Xu,

    Dr. Haokui Xu

    Department of Electrical Engineering and Computer Science

    University of Michigan

    USA

    Homepage

Jiyue Zhu,

    Dr. Jiyue Zhu

    Department of Electrical Engineering and Computer Science

    University of Michigan

    USA

    Homepage

Leung Tsang,

    Professor Leung Tsang

    Department of Electrical Engineering and Computer Science

    University of Michigan

    USA

    Homepage

Seung Bum Kim

    Dr. Seung Bum Kim

    California Institute of Technology

    USA

    Homepage

Progress In Electromagnetics Research, Vol. 170, 97-128, 2021
doi:10.2528/PIER20121201
Abstract
In this paper, we propose a fine scale partially coherent patch model (FPCP) for GNSS-R land applications for soil moisture retrieval. The land surface is divided into coherent planar patches on which microwave roughness is superimposed. The scattered waves of the coherent patch are decomposed into the coherent specular reflection and diffuse incoherent scattering. A fine scale of 2 meter patch size is chosen for the coherent patch to be applicable to complex terrain with large varieties of topographical elevations and with small to large topographical slopes. The summation of scattered fields over patches is carried out using physical optics. The phase term of the scattered wave of each patch is kept so that correlation scattering effects among patches are accounted for. Results are illustrated for power ratio for areas near the specular point and areas far away from the specular point. Comparisons are made with the radiative transfer geometric optics model. DDM simulations are performed with good agreement with CYGNSS data.
Citation
Haokui Xu, Jiyue Zhu, Leung Tsang, and Seung Bum Kim, "A Fine Scale Partially Coherent Patch Model Including Topographical Effects for GNSS-R DDM Simulations," Progress In Electromagnetics Research, Vol. 170, 97-128, 2021.
doi:10.2528/PIER20121201
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