HYDROACOUSTIC NAVIGATION SYSTEM Russian patent published in 2012 - IPC G01S15/08 

FIELD: physics.

SUBSTANCE: hydroacoustic navigation system has a navigation base consisting of M hydroacoustic transponders with different response frequencies and a hydroacoustic transceiver. The receiving hydroacoustic antenna consists of four hydrophones mounted on a linear support arm which is perforated. Antennae of the receivers are mounted on a steel plate. At least one of the M hydroacoustic transponders is placed on the water surface. The receiving hydroacoustic antenna also includes nine hydrophones, with formation of receivers of two navigation bases with a common base centre. They lie in a plane which is parallel to the plane of the bottom of the underwater object, wherein the axis of one base X is directed along the axial line of the underwater object, and the axis of another base Y is directed on the beam to the right. Each navigation base is formed from seven hydrophones, one of which is common for both navigation bases, at equal distances from which there are two hydrophones which form a common central part of the navigation bases consisting of nine hydrophones, wherein the outermost hydrophones of each of the navigation bases are displaced from the common central part of the navigation base by a distance greater than the distance between the hydrophones which form the common central part of the navigation bases. The linear support arm is additionally fitted with a sensor for determining sound speed, a hydrodynamic pressure sensor and an inertial sensor. Each of the M hydroacoustic transponders consists of an underwater and a surface module connected by a conducting rope to sensors of the inclination and length of the corroded rope. The surface module is provided with a satellite radio communication channel.

EFFECT: reduced error in measuring coordinates of an underwater object.

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