Microwave Chracteristics of Corn at Higher Frequencies by Modeling and Experiments Validation

In soil moisture retrieval by passive microwave technique at lower frequencies, the model is often used. To eliminate vegetation effects at higher frequencies than C-band, a Matrix-Doubling microwave emission model is developed in this paper to study the single scattering albedo and transmissivity of corn with different height at C (6.925GHz), X (10.65GHz) and Ku (18.7GHz) bands. The comparison between the simulated emissivity of corn and the data collected by a truck-mounted microwave radiometer in a field experiment were good. During the experiment, to verify the emission from vegetation layer only, the ground surface of corn field was placed with an Aluminum foil, so as to mask the emission from the ground. A Brightness Temperature database was established by the Matrix-Doubling model, to simulate emission of corn field with different height. The results from the database were then matched to those by model at the same parameters by least-square deviation, so as to retrieve the effective single scattering albedo and transmissivity of corn at C, X and Ku-band. The retrieved results were applied by PSR data during SMEX02 campaign, the retrieved soil moisture were close to the in situ measurements.