Nguyen V. Method of active aperture synthesis for radar imaging by remote sensing from aerospace carriers

The dissertation research is aimed at developing and researching the method of active aperture synthesis, which is advisable to use for the formation of a radio image in the viewing area, which traditionally does not inspect by aerospace carriers. This area is limited by viewing angles of ± 15° from the direction to the nadir and is traditionally not viewed by radars by means of imaging due to the low resolution of radars in spatial coordinates. A feature of the developed method is the use of wide / ultra-wideband stochastic signals, which make it possible to realize the advantages of spectral aperture synthesis in the developed method. Further in the work the method of active aperture synthesis, synthesis of the optimal algorithm of observation processing, quasi-optimal algorithm of signal processing, and development of the scheme of radio system has been proposed which unlike traditional passive systems of aperture synthesis provides formation of radio images in the field of view effective scattering surface, rather than the equivalent noise temperature, as is typical for classical systems of aperture synthesis. The method of active aperture synthesis involves the presence of a source of stochastic wide / ultra-wideband radiation, which when reflected by the underlying surface, is processed in many crocorrelation channels and allows you to form a radio image that is proportional to the specific effective reflection area. This allows combining existing radars with aperture synthesis with radar, which implements the method of active aperture synthesis. In this case, the viewing area from the aerospace carrier becomes continuous in the range of angles ± 50 °. In the work, the method of secondary processing of radio images has been improved. This method relies on optimal filtering with functions that are reversible to the ambiguity function of the radio system to improve the visual quality of images.