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Soil Moisture Profile Retrievals Using Reflection of Multifrequency Electromagnetic Signals
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2022
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Source: IEEE Transactions on Geoscience and Remote Sensing, vol. 60, pp. 1-10, 2022, Art no. 2006510
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Journal Title:IEEE Transactions on Geoscience and Remote Sensing
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Description:A method for retrieving soil moisture (SM) profiles using multifrequency, ground-reflected electromagnetic (EM) waves is proposed. In a previous publication, a retrieval technique was developed, which used variations in the angular dependence of the reflectivity to infer the SM profile. In this follow-on work a more practical approach based on the frequency dependence of the modulus of the reflection coefficient for a single incidence angle is extended and its feasibility demonstrated. Two possible approaches are considered: the direct retrieval of the SM profile and the retrieval of the dielectric constant (DC) profile. The former immediately yields the parameter of interest, however, it requires a soil dielectric model linking the DC of the soil to its water content. Such a model, which depends on the type of soil, may not be immediately available. The latter does not require a linking model, but by comparing measured profiles of the DC under dry and wet conditions, the SM profile can be estimated. Both approaches are considered in this article and their feasibility investigated with the help of numerical simulations in the presence of multiplicative noise in the data. For the case of a direct retrieval of the SM profile, a representative soil dielectric model was used. The retrieval procedure was simplified and made more robust and the frequency independence assumption of the DC in the earlier work was removed.
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Source:IEEE Transactions on Geoscience and Remote Sensing, vol. 60, pp. 1-10, 2022, Art no. 2006510
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Rights Information:Accepted Manuscript
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