Reconstruction of two-dimensional distribution of radio brightness using measurements by an antenna with the known angular pattern

We develop a method for reconstruction of two-dimensional distribution of brightness temperature using the measured antenna temperature. The method is based on the Tikhonov theory of illposed problems. The efficiency of the method is analyzed by numerical simulations of single-and multiple-beam synthetic-aperture radiometric systems. The proposed method is applied to helicopter measurements of thermal radio emission from the soil.