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A Method for Underwater Target Velocity Estimation Based on Acoustic Pressure Difference Cross-Correlation Spectrum Analysis in Beam Domain

A speed estimation, underwater target technology, applied in radio wave measurement systems, re-radiation, measurement devices, etc., can solve problems such as insufficient accuracy, and achieve the effect of accurate estimation.

Active Publication Date: 2017-01-25
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of insufficient precision of the moving target speed estimation method in the prior art, thereby providing a kind of moving target speed estimation method with higher precision

Method used

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  • A Method for Underwater Target Velocity Estimation Based on Acoustic Pressure Difference Cross-Correlation Spectrum Analysis in Beam Domain
  • A Method for Underwater Target Velocity Estimation Based on Acoustic Pressure Difference Cross-Correlation Spectrum Analysis in Beam Domain
  • A Method for Underwater Target Velocity Estimation Based on Acoustic Pressure Difference Cross-Correlation Spectrum Analysis in Beam Domain

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Experimental program
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Effect test

Embodiment

[0097] Embodiment: the present invention can be applied in remote underwater target detection technology.

[0098] Example of computer simulation:

[0099] In a numerically simulated ocean waveguide environment, the seawater depth is 200 meters, and the sound propagation speed in seawater is c w =1500m / s, the ocean sound velocity profile is assumed to be a uniform sound velocity, and the sound velocity of the sediment layer in the semi-infinite space of the seabed is c b =1598m / s, seawater density is ρ w =1024kg / m 3 , the seabed density is ρ b =1760kg / m 3 , the bottom attenuation coefficient is α b =0.2dB / λ, the target sound source is underwater z s = 40m, the target is moving in a straight line with a uniform speed and the moving speed is v 0 =2.5m / s, the receiving array is a horizontal uniform linear array, the number of array elements is 8, the distance between array elements is 1m, the receiving array and the target are located at the same ocean depth, and the initi...

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Abstract

The invention relates to a method for estimating underwater target speed by using sound pressure difference cross-correlation spectrum analysis of beam fields, wherein the method is used for realizing the speed estimation for movement targets on a horizontal array which comprises a plurality of evenly distributed isotropic array elements. The method comprises the steps of respectively collecting sound signals in each array element of the horizontal array; performing beam forming process on the collected sound signals to obtain beam field signals; performing beam field sound pressure difference cross-correlation process on the beam field signals to obtain the cross-correlation signals of the beam field about a time interval; performing spectrum analysis on the time interval parameter of the cross-correlation signals of the beam field to obtain a speed estimating result of the beam field.

Description

technical field [0001] The invention relates to the field of underwater long-distance target detection, in particular to a method for estimating the speed of an underwater target by analyzing the cross-correlation spectrum of sound pressure difference in the beam domain. Background technique [0002] In the field of underwater target detection, matching field processing methods, matching mode processing methods and waveguide invariant-based sound source localization methods for sound source localization have received the most attention. The matching field processing method mainly uses the signal model to calculate the receiving sound field corresponding to different sound source positions, and then performs correlation matching with the receiving sound field of the actual marine environment to obtain target positioning. However, the matching field processing method has the difficulty of simulating the actual ocean environment model, which is likely to cause positioning misma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S11/14
CPCG01S11/14
Inventor 王朋黄勇刘纪元
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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