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The analysis of wave scattering in a random medium plays one of important roles in the development of remote sensing technology. As a theoretical approach to the subject of measuring soil moisture by active microwave remote sensing, this paper considers a simple model of moist soil composed of air and three layers of random medium with many particles. A radiative transfer equation with coefficients estimated by the multiple scattering method developed by us is used to calculate the scattering cross section of the layers by changing the polarization and frequency of incident waves, layer thickness, and particle distribution in the depth direction. The calculation makes clear the characteristics of scattering cross sections of the layers. We also discuss the possibility of the detection of water content in moist soil on the basis of the characteristics.

Analysis of Wave Scattering from Three Layers of Random Medium by Using a Radiative Transfer Equation