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Method for quickly calculating characterization and transfer of uncertainties of marine environment and sound fields

A marine environment and certain technology, applied in the field of acoustics, can solve problems such as the uncertainty of the sound field

Active Publication Date: 2009-12-16
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

[0004] The present invention mainly aims at assuming that the sound field prediction model is accurate, and the uncertainty caused by the incomplete knowledge of the marine environment leads to the problem of the uncertainty of the sound field

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  • Method for quickly calculating characterization and transfer of uncertainties of marine environment and sound fields
  • Method for quickly calculating characterization and transfer of uncertainties of marine environment and sound fields
  • Method for quickly calculating characterization and transfer of uncertainties of marine environment and sound fields

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Embodiment Construction

[0116] Below in conjunction with specific implementation example and accompanying drawing, the present invention will be further described:

[0117] figure 1 It is a block diagram of the characterization and transfer structure of the ocean environment and sound field uncertainty of the present invention. It can be seen from the figure that the implementation process of the present invention is as follows: the array data received by the receiving array is first amplified and filtered, and then A / D conversion is performed, and the received analog signal is digitally sampled. The sampled discrete random sound pressure field and the predicted random sound pressure field are copied and correlated, and the processed results are sent to the display, giving the two-dimensional energy distribution of distance and depth. Finally, judge whether there is a target and estimate the distance / depth of the target according to the processing results. Wherein the prediction random sound pressu...

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Abstract

The invention relates to the field of acoustics, in particular to a method for quickly calculating characterization and transfer of uncertainties of marine environment and sound fields. The invention aims to solve the problems of random spectrum characterization of uncertain environmental parameters and uncertain sound pressure fields and whether to transfer the uncertainties form the environmental parameters to the sound pressure fields. The method comprises the following steps of: establishing a domain space taking the known quantity as a center for the uncertain environmental parameters and the uncertain sound pressure fields respectively; performing the probability density function description on the uncertain quantity; and chaotically carrying out the random spectrum characterization according to a polynomial taking the probability density function as the uncertain quantity, and further combining the chaotic random spectrum characterization of the polynomial and a certain wave equation, educing the random wave equation embedded with uncertainty, acquiring the system of partial differential equation of uncertain coefficients, and finally acquiring the uncertain sound pressure fields formed by the linear superposition of the chaos based function of the uncertain coefficient weighting polynomial. The method has the advantages that: the acquired uncertain sound pressure fields are the same as the result acquired by MonteCarlo, and the calculating speed of the method is improved by more than 10 times.

Description

Technical field [0001] The invention relates to the field of acoustics, in particular to a rapid calculation method for the characterization and transmission of the uncertainty of the ocean environment and sound field. Background technique [0002] Due to the inaccuracy of marine environmental parameters such as sea depth, sound velocity profile, and geoacoustic characteristics of the seabed, even if a definite signal is transmitted, the sound pressure field at the receiving point in the ocean appears as a random fluctuation field: it has uncertainty and variation in space and time sex. The advanced sonar signal processing is based on the propagation model to predict the signal propagating in the ocean, and then perform copy correlation processing with the received signal. Since a definite propagation model is used in the processing, that is, a set of specific environmental parameters are input to obtain a definite predicted sound pressure field. Such a propagation model c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S7/539G06F17/11
Inventor 赵航芳邹丽娜祝献
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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