СТАТИСТИЧЕСКОЕ ОБОСНОВАНИЕ ДОПУСТИМОГО СНИЖЕНИЯ ЧУВСТВИТЕЛЬНОСТИ МАГНИТОМЕТРА ПРИ СОХРАНЕНИИ ТРЕБУЕМОЙ ВЕРОЯТНОСТИ ОБНАРУЖЕНИЯ ПОДВОДНОГО ОБЪЕКТА

Abstract

The search for underwater potentially dangerous objects using towed magnetometric systems during environmental surveys and rescue operations does not lose its relevance. The existing practice of increasing their effectiveness by increasing the sensitivity of the magnetic field sensor (up to 0.01–0.0001 nT) entailed an increase in weight and size characteristics and cost. At the same time, the stochastic nature of the search process was not taken into account, leading to an indefinite signal-to-noise ratio associated with the random position of an underwater object in the search band, which led to its unacceptable omission. Therefore, the modern search for potentially dangerous underwater objects required their guaranteed detection with an increased probability. The developed methodology for using data from statistical analysis of the amplitude characteristics of the magnetic field induction of an underwater object (signal) and a towing vehicle (interference) makes it possible to determine the width of the guaranteed detection band. The values of the ratios of the average values of the amplitudes of their magnetometric signals, corresponding to the probabilistic characteristics of detection, depending on the values of the magnetic moments in the search band, are determined. Boundary conditions for zones of guaranteed detection of an underwater object with an increased probability Pc = 0.8–1.0 are established in accordance with the level of "signal-to-interference" ratios. Taking into account the stochastic nature of the process of searching for an underwater object, a substantiation of the permissible sensitivity of the magnetometer was carried out, which leads to a decrease in its weight, size and cost characteristics without reducing the required detection probability.