Sensitivity of bistatic scattering to soil moisture and surface roughness of bare soils

Abstract

The sensitivity of bistatic scattering coefficient sigma degrees to soil moisture content (SMC) and surface roughness was investigated by means of model simulations of the incoherent scattered fields performed with the advanced integral equation model (AIEM) and the second order small perturbation model (SPM). The study was performed by simulating scattering on the whole upper half space, for different values of incident angles. The achieved results, represented as maps of sigma degrees as a function of azimuth and zenith angles, were evaluated by means of a quality index which takes into consideration the effect of roughness on SMC measurement. The sensitivity analysis has pointed out that for measuring SMC a bistatic observation, by itself or combined with the monostatic one, can make appreciable improvements with respect to classical monostatic radar. Appendix A contains the AIEM formulas corrected for several typographical errors present in the specific literature

Remote sensing for mapping soil moisture and drainage potential in semi-arid regions: Applications to the Campidano plain of Sardinia, Italy

“…Some researchers work at field scale using theoretical inversion models with radar images Brogioni et al, 2010;Dong et al, 2013;Nearing et al, 2010;Wu et al, 2008). Those studies are essential to the understanding of radar signal interaction with soil parameters in order to improve the estimation of surface SM for various ground types.…”

Estimating Snow Characteristics with Multifrequency Microwave Radiometry

“…The model [5] is based on the Advanced Integral Equation Model [6] to represent soil, coupled to a layer of dry snow whose electromagnetic properties are described by the Dense Medium Radiative Transfer Theory with Quasi Crystalline approximation applied to a medium (air) filled with sticky particles [7].…”

Quasi-optical Systems Based on Periodic Structures

“…The complimentary field coefficients F qp that appear in the right term of the equation (5.1.11) are obtained from the definition of the qp F  after the Green's function and its gradient are replaced by the simplified spectral representation, above mentioned, and after the phase factor of the Green function and u, v, x', y' integrations are factored out. The expressions of such coefficients together with the expressions of the Kirchhoff ones are reported in (Brogioni et al, 2010). Once the field coefficients, f qp and F qp , are made independent of spatial variables, it is possible to provide the expression of the incoherent scattered power: 5.1.17) and from this the bistatic scattering coefficient:…”