Side-scan sonar underwater high-precision positioning system and method

Abstract

The invention provides a side-scan sonar underwater high-precision positioning system and method. The system comprises a measuring ship, a tow fish and an ultra-short baseline positioning module, and is characterized in that the measuring ship is provided with a GPS unit and a control unit, and the control unit is respectively connected to the GPS unit and the ultra-short baseline positioning module; the ultra-short baseline positioning module is used for determining relative three-dimensional position coordinates of the tow fish and a specific component thereon relative to the measuring ship; the control unit is used for determining position coordinates of the measuring ship by using the GPS unit; and performing positioning on the tow ship according to the relative three-dimensional position coordinates and the position coordinates of the measuring ship so as to acquire positioning information.

Description

technical field [0001] The invention relates to the field of underwater positioning, in particular to a side-scan sonar underwater high-precision positioning system and method. Background technique [0002] Side-scan sonar has high-resolution and real-time image display functions, which can accurately identify the characteristics of submarine targets, ascertain the shape, size, exposure height, general nature, and overview of submarine substrate types of obstacles. It plays an important role in construction inspections. playing a very important role. [0003] At present, the side-scan sonar used for underwater target scanning mostly adopts the stern towed type. The length of the towed rope is 5m, 20m, 50m or longer depending on the water depth. This operation method cannot obtain underwater towed fish in real time. The dynamic position of the side-scan sonar underwater towfish is mostly determined by empirical simple estimation based on the relative relationship with the GP...

AI Technical Summary

Problems solved by technology

[0003] At present, the side-scan sonar used for underwater target scanning mostly adopts the stern towed type. The length of the towed rope is 5m, 20m, 50m or longer depending on the water depth. This operation method cannot obtain underwater towed fish in real time. The dynamic position of the side-scan sonar underwater towfish is mostly determined by empirical simple estimation based on the relative relationship with the GPS antenna. The positioning accuracy of the underwater target scanned by this method cannot be very high. Affected by wind, waves and currents, the towfish used for side-sweeping operations will move irregularly in the water, eventually resulting in a measurement and positioning accuracy of 1 meter or more, which cannot meet the actual production needs, and often requires other It will result in a waste of economic and time costs. How to improve the positioning accuracy of towfish is a difficult point.

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