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Method of acquiring deep sea great depth sound field horizontal and longitudinal correlation

A horizontal and vertical correlation technology, applied in the fields of marine engineering, array signal processing, sonar, and underwater acoustic engineering, can solve the problems of affecting signal correlation, consuming calculation time, and calculation results that cannot be transplanted to other ocean backgrounds. Engineering practice, the effect of reducing the amount of calculation

Active Publication Date: 2017-04-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

This method consumes a lot of calculation time and is limited by the complexity of the environment, so the calculation results cannot be transplanted to other ocean backgrounds
And the calculation results cannot reflect how the underwater sound propagation affects the signal correlation
At present, there is a lack of concise, intuitive and practical calculation methods

Method used

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  • Method of acquiring deep sea great depth sound field horizontal and longitudinal correlation
  • Method of acquiring deep sea great depth sound field horizontal and longitudinal correlation
  • Method of acquiring deep sea great depth sound field horizontal and longitudinal correlation

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Embodiment Construction

[0038] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0039] figure 1 : The sound velocity profile used for the simulation

[0040] To calculate the arrival delay difference between the sound ray direct wave and the sea surface reflection wave, a typical deep-sea Munk profile is used, and the sound velocity is as follows: figure 1 shown. Since the sound field in the deep-sea direct wave area is mainly contributed by the direct wave and the sea surface reflected wave, we ignore the influence of the seabed reflected wave on the correlation calculation.

[0041] The calculation process is divided into the following five steps:

[0042] Step 1: Assume broadband sound source depth z s , center frequency ω 0 , the coordinates of the two receiving locations near the deep seabed are (z, r) and (z, r+Δr), respectively, where z represents the receiving depth, r represents the receiving distance, and Δr represents the hor...

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Abstract

The invention relates to a method of acquiring deep sea great depth sound field horizontal and longitudinal correlation. Two testing positions, which are close to a deep sea seabed, are arranged at the same depth and different distances, are selected, and according to a ray model, a time delay difference between a direct wave and a sea surface wave of one sound source at a depth reaching two receiving positions is calculated. One testing position is fixed, and the horizontal spacing between the two positions is changed continuously, and the time delay differences between the direct wave and the sea surface reflection wave reaching the different positions are recalculated. By introducing the deep sea great depth sound field horizontal and longitudinal related calculation formula based on the ray theory, a change rule of horizontal and longitudinal correlation of a target area is acquired. The method provided by the invention is advantageous in that the sound field-related qualitative change rule is described according to the formula; compared with a method of calculating a sound field related length by tedious sound field modeling in an on-line manner, calculation amount is greatly reduced, and engineering practice is facilitated.

Description

technical field [0001] The invention belongs to a method for processing underwater acoustic signals, and relates to a method for obtaining the horizontal longitudinal correlation of deep-sea large-depth sound fields, which is suitable for qualitative analysis of the horizontal longitudinal correlation of deep-sea large-depth sound fields and quantitative estimation of correlation lengths. Acoustic engineering, array signal processing and sonar technology and other fields. Background technique [0002] Target detection, positioning, tracking and identification under the background of ocean channel is of great significance to the fields of underwater information operations and ocean engineering. The development of underwater acoustic signal processing can be roughly divided into two stages: [0003] (1) In the first stage, assuming that the ocean channel is an ideal channel, the adaptive array signal processing technology is actively developed to improve the array signal proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H3/00G01S15/00G01S15/02G01S15/66
CPCG01H3/00G01S15/003G01S15/02G01S15/66G01H5/00G01S5/18G01S11/14G01V1/303G01V1/3808G01V1/38
Inventor 杨坤德李辉段睿何正耀段顺利雷波韩一娜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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