Scientific and technical ways of reducing quantitative indicators of false alarms during the operation of an airboard radar station on the background of the underlying surface (earth)

The purpose of the research is development of scientific and technical ways to reduce the quantitative indicators of false alarms when operating an on-board radar station against the background of the underlying surface (earth) against the background of passive interference. Methods. When conducting scientific research, methods of probability theory, mathematical statistics, statistical radio engineering and computational mathematics were used. The study identified a number of methods and technical solutions based on them that make it possible to increase the efficiency of the functioning of airborne radar stations against the background of passive interference. The paper proposes a method for expanding the signal spectrum to 1 GHz by reducing the resolved volume of airborne radar stations. Physically, this is determined by the fact that with a decrease in the resolved volume, the size of the underlying surface area from which the signal is reflected decreases. In order to improve the quality of detection of objects against the background of the underlying surface, a method of using polarization modes is proposed. Results. In the course of the research: a technical solution was proposed based on the method of expanding the signal spectrum to 1 GHz by reducing the resolution volume of airborne radar stations designed to convert radio frequency signals into digital form, using a mixed signal receiver with direct digitization at radio frequency, such as the AD6688 ; a design of a low-baseline radar system has been developed, consisting of two positions, the antennas of which are located within the average width of the lobe of the backscattering diagram of the irradiated object; a feature of the antenna is the ability to receive and emit signals of the same linear polarization, but orthogonal to the polarization of the first position (including . horizontal and vertical polarization signals); an important relation was obtained for a lowbaseline polarization measuring system (MPIS) when the distance between two partial antennas can be much less than the distance to the measured object. Conclusion. The scientific article proposes methods and technical solutions based on these methods to reduce the quantitative indicators of false alarms when operating an on-board radar station against the background of the underlying surface (ground) against the background of passive interference. The proposed approach allows us to move on to the synthesis of a low-baseline polarization measuring system.