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A C band microwave scatterometer was designed and made for soil moisture measurement in a indoor experiments. After some electromagnetic experiments, many experiments were carried out to clarify the basic characteristics of the soil backscatter from its surface. These experiments give the following results: (i) C band microwave penetrates the soil to 10 cm depth, (ii) 2.5cm depth surface soil sampling is optimum to regress the soil moisture with the backscatter coefficients, (iii) the backscatter coefficients are sensitive to the incident angle in less than 30•‹, (iv) HH polarization is more sensitive to the soil moisture than the HV polarization, (v) surface roughness has a significant effect on the soil backscatter.

Soil Moisture Measurement by the Active Microwave Remote Sensing. I. Indoor Experiment.