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Deconvolution based downward-looking synthesis aperture 3D imaging method and system

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

Active Publication Date: 2019-11-05
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • 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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  • Deconvolution based downward-looking synthesis aperture 3D imaging method and system
  • Deconvolution based downward-looking synthesis aperture 3D imaging method and system
  • Deconvolution based downward-looking synthesis aperture 3D imaging method and system

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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 deconvolution based downward-looking synthesis aperture 3D imaging method and system. The method comprises that a sonar echo digital signal is calculated according to a workparameter of a sonar system, pulse compression in the depth direction is carried out on the sonar echo digital signal, and a compressed signal in the depth direction in a cylindrical coordinate systemis obtained; time-delay imaging is carried out on the compressed signal in the depth direction to obtain a downward-looking synthesis aperture 3D imaging result is obtained; and the obtained 3D imaging result is deconvluted to obtain a final 3D imaging result. Downward-looking synthesis aperture 3D imaging is realized in the cylindrical coordinate system, and a higher imaging resolution can be obtained by deconvolution.

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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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
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