Abstract
Remote sensing of soil moisture in a bistatic mode has attracted increasing attention in recent years. This paper investigates the bistatic radar response of soil moisture and surface roughness at L-band by using the advanced integral equation model (AIEM). To better explore the potential of bistatic scattering for soil moisture sensing, both polarized and angular scattering coefficients, and their combinations, were evaluated using a defined sensitivity index. Results show that sensitivity is enhanced in a bistatic mode compared to the monostatic case. Using a combination of dual polarized and angular data suppresses an undesired impact of the surface correlation function. Among the combinations, the dual angular observation reduces the influence of surface roughness, preserves a good sensitivity to soil moisture, and thus seems to be a good candidate for sensing soil moisture in bistatic configuration.
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