Osinovyy G. Methods of active and passive protection of smallsized ground objects from matrix radiometric passive-active detection systems of millimeter range

METHODS OF ACTIVE AND PASSIVE PROTECTION OF SMALL-SIZED GROUND OBJECTS FROM MATRIX RADIOMETRIC PASSIVE-ACTIVE DETECTION SYSTEMS OF MILLIMETER RANGE The actual scientific task of reducing the radiometric visibility of small-scale land mobile objects from passively active radiometric detection systems of the millimeter range is solved in the dissertation. The developed and improved models and methods are based on the method of estimating the probability and range of detection of small-sized, including mobile, ground objects created by passive-active radio-metric systems for detecting and identifying a millimeter range. The method allows to estimate a large number of factors (power and multi-positional construction of the illumination source, the bandwidth of the receiver of the PM system, the characteristics of the backlight antenna and the PM system), and the conditions for viewing the PM system (viewing angles, dimensions and configuration of the object, influence of atmospheric hydrometeors) that affect the detection or non-detection of small-scale land-based objects. Analytical expressions obtained in the work allow to evaluate the influence on the detection process of the proposed methods and means of protection, and thus to evaluate the effectiveness of methods for reducing the visibility of small-sized land mobile objects from radiometric detection systems of the millimeter range. The use of passive protection systems (camouflage coverings) of small-sized ground objects, which reduce the emissivity, for example, by 10 dB, reduces the detection range of objects by passively active systems by at least three times. The use of active illumination of objects by an own source of noise illumination with adjustable power makes it possible to provide a small, in the limit of zero, contrast of the "object - background of the Earth's surface" at the input of the radiometric receiver of the passive detection system, practically at any range from the detection system to the small-sized ground object. Keywords: high-speed aircraft, millimeter range, matrix correlation-extreme detection systems, active and passive protection systems, camouflage coverings.