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Active sonar echo or scattered wave time domain simulation method for complex underwater target

An active sonar and underwater target technology, applied in the field of signal processing, can solve problems such as less characteristic information, difficulty in meeting accurate target recognition, and inability to simulate sound scattering characteristics of structures, etc., to achieve realistic simulation effects

Pending Publication Date: 2021-07-16
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

The target echo signal simulated by this method contains relatively little characteristic information of the target itself, and it is impossible to simulate the acoustic scattering characteristics of the target such as material, shape, structure, etc., and it is difficult to meet the requirements for more accurate identification of the target

Method used

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  • Active sonar echo or scattered wave time domain simulation method for complex underwater target
  • Active sonar echo or scattered wave time domain simulation method for complex underwater target
  • Active sonar echo or scattered wave time domain simulation method for complex underwater target

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Experimental program
Comparison scheme
Effect test

specific Embodiment

[0044] first step:

[0045] (1) Establish a 3D solid model of an underwater target of any shape;

[0046] (2) Define material properties;

[0047] (3) Carry out limited grid division;

[0048] (4) Establish the simulation environment model of the target and underwater sound field under the finite element software.

[0049] like figure 1 (a) (b) (c) (d) shown.

[0050] Step two:

[0051] Define the plane wave sound source, generate broadband excitation signal and sound field response such as figure 2 shown. Apply the broadband excitation signal to the target, and calculate the acoustic scattering echo response h(t) of the target, and its waveform is as follows image 3 shown.

[0052] third step:

Embodiment 1

[0054] The active sonar detection signal reflected by the target, the commonly used CW signal is selected here, such as Figure 4 As shown, the convolution operation is performed on the time domain with the target echo or acoustic scattering wave broadband impulse response signal extracted in the second step (it can also be converted to the frequency domain for calculation, and the convolution value can be obtained by inverse transformation), which can be Obtain target echo or acoustic scattered wave response signal:

[0055] Compare the target echo or scattered wave response signal obtained by the convolution operation with the target echo or scattered wave signal obtained by directly acting on the target with the CW signal, as shown in Figure 5 and Figure 6shown. It can be seen from the figure that the signal waveforms obtained by the two methods are consistent, and the correlation coefficient of the two signals is 0.9979, which proves the effectiveness and practicabilit...

Embodiment 2

[0057] Change the active sonar detection signal reflected by the target from a CW signal to an LFM signal, such as Figure 7 As shown, the rest remain unchanged, and the time-domain response signal of the target echo or scattered wave can be obtained. Compare the target broadband impulse response signal obtained by the convolution operation with the target echo or scattered wave signal obtained by directly acting on the target with the LFM signal, as shown in Figure 8 and Figure 9 shown. It can be seen from the figure that the signal waveforms obtained by the two methods are consistent, and the correlation coefficient is 0.9971, which proves the effectiveness and practicability of the method.

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Abstract

The invention discloses an active sonar echo or scattered wave time domain simulation method for a complex underwater target, and the method comprises the steps: building a geometric model of a target and a water area through finite element software, setting the material parameters of the target, the environment parameters of the water area and the sound-structure interaction boundary conditions, and carrying out the grid division; secondly, calculating a sound pressure scattering field of the target by utilizing the generated broadband pulse excitation signal, and obtaining broadband pulse time domain response of target echoes or sound scattering waves at any receiving point; and finally, performing convolution operation on the active sonar detection signal and the broadband pulse sound scattering echo time domain response signal of the target in the time domain to obtain an echo or scattering wave time domain signal of the target to the active detection signal. The underwater target echo waveform generated by the method comprises information such as material, structure, shape and the like of the target, and compared with an existing echo simulation method, the simulation effect is more vivid.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a time-domain simulation method for active sonar waveforms. Background technique [0002] The underwater acoustic target simulator includes acoustic decoys, noise jammers, torpedo acoustic targets, etc., and plays an important role in sonar equipment testing, torpedo development and naval training. In terms of use, acoustic target simulators are generally divided into two categories, one is acoustic decoys, noise jammers and other underwater acoustic anti-jamming equipment, which are used to confuse and interfere with enemy sonar and torpedoes, so as to ensure the safety of own ships and submarines. Safety; one category is torpedo acoustic target as the target of acoustic tracking, which is applied to underwater acoustic technology equipment for tracking characteristic test, performance evaluation and actual use training. The target simulation method adopte...

Claims

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Application Information

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IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 邱宏安王英民王关峰王成郑琨王奇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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