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A method and system for down-looking synthetic aperture three-dimensional imaging based on deconvolution

A three-dimensional imaging and synthetic aperture technology, which is applied in radio wave measurement systems, re-radiation of sound waves, instruments, etc., can solve the problems of affecting the clarity of three-dimensional imaging results and difficult to improve imaging resolution.

Active Publication Date: 2021-04-09
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the cross-direction imaging resolution of down-looking synthetic aperture three-dimensional imaging sonar is limited by the receiving aperture, the imaging resolution is difficult to improve, and the clarity of three-dimensional imaging results is affected. A downward-looking synthetic aperture 3D imaging method based on convolution processing, which uses the cross-course point target spread function to realize deconvolution processing, and realizes cross-course high-resolution imaging

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  • A method and system for down-looking synthetic aperture three-dimensional imaging based on deconvolution
  • A method and system for down-looking synthetic aperture three-dimensional imaging based on deconvolution
  • A method and system for down-looking synthetic aperture three-dimensional imaging based on deconvolution

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Embodiment 1

[0147] Embodiment 1 of the present invention provides a deconvolution-based down-looking synthetic aperture three-dimensional imaging method, the method comprising:

[0148] Step 1) Calculate the sonar echo digital signal according to the working parameters of the sonar system, perform depthwise pulse compression processing on the sonar echo digital signal, and obtain the depthwise compressed signal under the cylindrical coordinate system;

[0149] The geometric model of the down-looking synthetic aperture sonar echo signal is as follows: figure 1 As shown, the height of the transmitting and receiving array from the bottom of the sea is H, and the down-looking synthetic aperture sonar sails in a straight line at a constant speed v along the y direction. The circle represents the receiving array, the square represents the transmitting array, and there are M receiving array elements in total. according to figure 1 Middle-down looking synthetic aperture sonar target echo model,...

Embodiment 2

[0226] Embodiment 2 of the present invention proposes a deconvolution-based down-looking synthetic aperture three-dimensional imaging system, the system comprising:

[0227] The compression processing module is used to calculate the sonar echo digital signal according to the working parameters of the sonar system, perform depthwise pulse compression processing on the sonar echo digital signal, and obtain the depthwise compressed signal under the cylindrical coordinate system; including:

[0228] The compression processing module includes:

[0229] The receiving array element position calculation unit: the down-looking synthetic aperture sonar sails along the y direction at a constant speed v, and the transmitting array element's position is (0,y T ,0), y T =y R +t2r, wherein, t2r represents the distance between the transmitting array and the xOz where the receiving array is located; the position of the receiving array element (x m ,y R ,0) is:

[0230]

[0231] Among t...

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Abstract

The invention discloses a method and system for down-looking synthetic aperture three-dimensional imaging based on deconvolution. The method includes: calculating the sonar echo digital signal according to the working parameters of the sonar system, and performing depthwise pulse on the sonar echo digital signal. Compression processing to obtain the compressed depth signal in the cylindrical coordinate system; time-delay imaging processing for the compressed depth signal to obtain the 3D imaging result of down-looking synthetic aperture; deconvolution processing the obtained 3D imaging result to obtain The final 3D imaging result. The invention realizes down-looking synthetic aperture three-dimensional imaging in a cylindrical coordinate system, and can obtain higher imaging resolution through deconvolution processing.

Description

technical field [0001] The invention relates to the field of imaging sonar systems, in particular to a deconvolution-based down-looking synthetic aperture three-dimensional imaging method and system. Background technique [0002] The downward-looking synthetic aperture 3D imaging sonar combines multi-beam imaging and synthetic aperture technology to obtain 3D imaging results of underwater targets. The imaging sonar can obtain high-resolution imaging along the course by using synthetic aperture along the course. The signal bandwidth can obtain high-resolution imaging in the depth direction, but the cross-course resolution ability is limited by the length of the receiving array. By increasing the length of the cross-course receiving array, the cross-course resolution can be effectively improved, but the difficulty, complexity and cost of its system implementation will increase sharply. [0003] In order to solve the problem that the cross-course imaging resolution is difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/89G01S7/52
CPCG01S7/52003G01S15/89
Inventor 王朋张羽刘纪元黄海宁
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI