Depth-information-based ultra-short baseline positioning system and method

Abstract

The invention discloses a depth-information-based ultra-short baseline positioning system and method. The system is composed of an ultra-short baseline plane array, an underwater transponder, a strapdown inertial navigation system and a Doppler log. The ultra-short baseline plane array being a five-element cross array is installed at the bottom of a mother ship or the bottom of a surface buoy and is formed by four receiving hydrophones and one transmitting transducer. The underwater transponder is installed at an underwater mobile target carrier. The ultra-short baseline plane array and the underwater transponder are integrated with pressure sensors. According to the depth-information-based ultra-short baseline positioning system, the spatial position of the underwater transponder is calculated by using depth difference information to replace traditional slope distance information; and with combination of the Doppler compensation and fast correlation techniques of complicated wideband coding and the multi-source-information-fusion-based dynamic fast positioning technology, no time synchronization and inquiring are needed during the working process of the ultra-short baseline positioning system, so that the positioning process of the underwater mobile target is simplified greatly and requirements of low power consumption, miniaturization, and high updating rate of the positioning system are met.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic positioning, in particular to an ultra-short baseline positioning system and method based on depth information. Background technique [0002] Ocean acoustics technology has always played an important role in underwater target detection, ROV navigation, AUV operations, towed tracking, resource exploration and other fields, and sound waves are the only medium for underwater equipment to perform long-distance communication, positioning, and navigation. Research on underwater acoustic positioning systems and methods is an insurmountable obstacle to the development of marine equipment. The existing acoustic positioning systems mainly include long baseline positioning systems, short baseline positioning systems, and ultra-short baseline positioning systems. Compared with the ultra-short baseline positioning system, the long baseline and short baseline positioning systems have high positionin...

AI Technical Summary

Problems solved by technology

However, in the traditional ultra-short baseline positioning method, the working method of the query response makes the update rate of the position information low, and the measurement of the round-trip time will also bring certain errors to the positioning accuracy.

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