Ultra-short baseline positioning optimization method based on maximum offset method

Abstract

The invention discloses an ultra-short baseline positioning accuracy optimization method based on the maximum offset method. The ultra-short baseline positioning optimization method comprises steps offirstly obtaining a baseline geometric structure composed of hydrophones on an ultra-short baseline, a phase difference between the hydrophones, a temperature difference between an underwater targetand the hydrophones, depths and original sound speed data within the target range of the hydrophones; pre-processing the original sound speed data according to the original sound speed data in the range, using the maximum offset method to simplify and optimize the sound speed within the area; according to the fluctuation of the sound speed in the measurement area, the adjusting a threshold value;after the sound speed data is optimized, converting the sound speed of the shallow water region into a wavelength; and according to the obtained data, using the relationship between the physical law and the solid geometry to obtain a slant distance of the hydrophones from the underwater target and the three-dimensional coordinates of the underwater target relative to the ultra-short baseline array. The ultra-short baseline positioning optimization method has the beneficial effects of improving the positioning accuracy and self-adaptive capability of the ultra-short baseline system and improving the system operation speed.

Description

technical field [0001] The invention belongs to the field of underwater positioning and navigation, and relates to a positioning optimization method, in particular to an ultra-short baseline positioning accuracy optimization method based on a maximum offset method. Background technique [0002] In order to promote social development and solve the problem of land resources becoming increasingly barren, in addition to the rational use of land resources, the development and effective use of marine resources is also of great significance. However, a series of marine activities such as the investigation and development of marine resources need to rely on high-precision underwater location information. So underwater positioning is a crucial step in obtaining ocean data. Because the underwater acoustic environment is extremely complex, the propagation of underwater sound will be affected by various factors such as temperature, seabed depth, salinity, etc. Different waters have the...

AI Technical Summary

Problems solved by technology

At the current level of instrument precision, the positioning accuracy of the ultra-short baseline positioning system is mainly limited by the difficulty in estimating the time delay of sending and receiving caused by sound ray propagation errors, and the difficulty in predicting the propagation paths of sound rays such as refraction and reflection, which makes sound ray tracking, Compensation and other measures are difficult to effectively implement, which limits the further improvement of underwater positioning accuracy

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