METHOD FOR REGISTRATION OF THE PASSAGE CHARACTERISTICS OF A MARINE OBJECT Russian patent published in 2022 - IPC G01S15/04 

FIELD: hydroacoustics.

SUBSTANCE: usage: invention relates to the field of hydroacoustics, namely to a method for registering the passage characteristics of a marine object in a wide frequency band, and can be used to measure the primary hydroacoustic field of marine objects in conditions of non-stationary interference within the time of registration of the passage of a marine object and an increased level of random background noise emissions of the marine area, as well as in security devices for protection of marine areas, port and other structures. Essence: according to the invention, the method for registering the passage characteristics of a marine object consists in first registering in the receiving devices the “reference” amplitude-frequency response (frequency response) of the noise field of the water space. After that, it is filtered, analog-to-digital conversion and median filtering in the primary signal processing unit are performed, and then used to determine a pair of receiving devices in the mutual correlation function calculation unit and make a decision of the secondary signal processing unit. Further, the “reference” frequency response is fed to the corresponding inputs of the adaptive filter of the secondary signal processing unit, where the “normalized” frequency response of the noise field of the protected water space is generated. When a marine object appears in a protected water space, a “working” frequency response of the water space is formed in the area of the location of the receiving devices, which is fed through the previously selected first receiving channel to the first input of the mutual correlation function calculation and decision-making unit and the first input of the adaptive filter of the secondary signal processing unit. When the amplitude of the “working” frequency response of the water space exceeds the developed threshold of the “normalized” frequency response, the frequency response of the marine object is recorded. The fundamental distinction of the claimed invention is that in the claimed method implemented in the proposed device for registering the passage characteristics of a marine object using a moving average filter, after performing median filtering in the receiving channels of the primary signal processing unit, averaging filtering is additionally carried out by using appropriate moving average filters.

EFFECT: possibility of suppressing both pulse and correlated interference and the incoherent component of broadband random interference, which makes it possible to increase noise immunity when registering the passage characteristics of a marine object.

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