We present methods and results of radio imaging of various technical objects at a frequency of 94 GHz for vertical and horizontal polarizations. We analyze the features of the formation of polarization-difference images in the millimeter-wave range and the typical properties and methods of processing of such images. The influence of experimental conditions (noise level, antenna focusing, and imperfect knowledge of the directional pattern) on the quality of image reconstruction is numerically simulated. To increase the spatial resolution of images, we propose filtering of the spatial spectrum of a reconstructed image, which allows for its a priori statistical characteristics. Possibilities of passive polarization stereo imaging and a method of its realization in the millimeter-wave range are considered.
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