Acoustic passive positioning method for treating underwater target by linear difference frequency matching field and medium

Abstract

The invention belongs to the technical field of underwater target detection, and discloses an acoustic passive positioning method for treating an underwater target by a linear difference frequency matching field, and a medium. The method comprises the steps of preprocessing each array element signal of a vertical array, dividing search grids and calculating a copy field (including actually measured environmental parameter input), performing high-order cross-spectrum processing, performing cost function and target sound source distance estimation, and estimating the depth of the target sound source. According to the invention, the multi-valued problem of conventional matching field processing target distance estimation is effectively solved; and the target sound source depth estimation is realized by utilizing the distance estimation value and the completeness condition of the simple positive waves; due to the fact that the modal ray propagation paths corresponding to the adjacent frequency simple positive waves are basically the same, the influence of environmental fluctuation is restrained or weakened through adjacent frequency cross-spectrum processing, and compared with a traditional matching field positioning method, the tolerance to the environmental fluctuation is improved through a linear difference frequency matching field method, and the stability of underwater targetpositioning is improved; the copy field calculation amount is effectively reduced, and the calculation efficiency of the positioning method is improved.

Description

technical field [0001] The invention belongs to the technical field of underwater target detection, and in particular relates to a linear difference frequency matching field processing underwater target acoustic passive positioning method and a medium. Background technique [0002] At present: Compared with active positioning, passive acoustic positioning of underwater targets has stronger security and concealment. It has been widely used in underwater acoustic countermeasures and target detection and positioning. One of the main methods is Matched Field Processing (Matched Field Processing, MFP) technology. [0003] Matched field processing is an array processing algorithm that uses the overall structure of the acoustic signal propagating in the ocean channel to process, and makes full use of the multi-path propagation characteristics of the acoustic signal. As the name suggests, matching field processing needs to divide the grid in the search space, and each grid point is...

AI Technical Summary

Problems solved by technology

[0008] (1) There is a periodic solution problem in the existing matching field target distance estimation method

[0009] (2) Traditional matching field processing has poor tolerance to environmental mismatch

[0010] (3) The copy field has a large amount of calculation

Since the complete spatial fluctuation information of the marine environment cannot be obtained in practical applications, the copy field is often calculated using local environmental information. The phase difference calculated by the copy field has a large deviation from the actual phase difference, resulting in a large error in target distance estimation.

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