Theoretical analysis of soil freeze/thaw process on DDM waveform and multipath in order for GNSS-R/IR applications

doi:10.11947/j.AGCS.2019.20180038

Abstract

Abstract: In order to extend the applications GNSS-R/IR(GNSS-reflectometry/interferometric reflectometry) remote sensing technique to soil freeze/thaw process detection, soil(frozen/thawn) mixing permittivity models are employed to calculate the soil permittivity. Bistatic full-polarization coherent scattering model and random roughness surface scattering model are used to calculate the coherent and non-coherent scattering, which result in the variations of GPS multipath observables and DDM(delay Doppler map) waveforms, respectively. When the soil freeze/thaw process occurs, theoretical simulations indicate that soil freeze/thaw process induce the abrupt permittivity changes and affect the obvious variations of GNSS-R/IR signals. In this way, theoretical fundamentals for soil freeze/thaw process detections are presented.

Key words: GNSS-R/IR, soil freeze/thaw process, delay Doppler map, multipath, bistatic scattering full polarization

CLC Number:

P237

WU Xuerui, XIA Junming, BAI Weihua, ZHANG Xinggang. Theoretical analysis of soil freeze/thaw process on DDM waveform and multipath in order for GNSS-R/IR applications[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(8): 1059-1066.

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