Discrete scatter model for microwave radiometer response to wheat field, comparison of theory and data

A bistatic scatter model developed based on the Michigan grassland coherent model was used to simulate bistatic scattering coefficients from wheat field at L and C band. And the wheat field emissivities at V and H polarization were also obtained by integrating the bistatic coefficients over all scattering angles above ground. An experiment was carried out over a flat agriculture area located at Baoding, in the Hebei province of China. The plant and soil parameters were collected over a growing season, and the emissivities were also obtained using the ground-based microwave radiometer at the C-, X-, Ku-, and Ka- bands, in H and V polarizations. The radiometer model values are in good agreement with the measurements at some full growth stages.