A SAR interferometric model for soil moisture

Journal article (2014)

Research Group

Mathematical Geodesy and Positioning () (TU Delft)

Coherence Soil moisture Synthetic aperture radar (SAR) interferometry

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http://resolver.tudelft.nl/uuid:26fffc00-2bbb-4fc8-86b0-7c3790ab2d02

Published Date

2014-1

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Geoscience and Remote Sensing

Research Group

Mathematical Geodesy and Positioning

Abstract

There is a need for scattering models that link quantitatively synthetic aperture radar (SAR) interferometric observables to soil moisture. In this paper, we propose a model based on plane waves and the Born approximation, deriving first the vertical complex wavenumbers in the soil as a function of geometrical and dielectric properties and successively the complex interferometric coherences. It is observed that soil moisture behaves on the phase in a similar way as tomography does, breaking the phase consistency in triplets of interferograms. The proposed model is validated with L-band airborne SAR data; preliminary inversion results based on interferogram triplets and coherence magnitudes are presented.