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Downward-looking multi-beam synthetic aperture imaging sonar zero-degree interference suppression method

A technology of synthetic aperture and imaging sonar, which is used in the re-radiation of sound waves, radio wave measurement systems, and the use of re-radiation. It can solve the problems of image interference and false imaging results, and achieve the effect of "zero-degree" interference suppression.

Active Publication Date: 2020-08-04
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] In the process of high-resolution imaging and detection of underwater targets by downward-looking multi-beam synthetic aperture imaging sonar, the acoustic signal is emitted directly below, and the echo signal is used to image the bottom target. The quality directly transmits the echo component, resulting in "zero-degree" interference in the image, and false phenomena in the downward-looking multi-beam imaging results

Method used

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  • Downward-looking multi-beam synthetic aperture imaging sonar zero-degree interference suppression method
  • Downward-looking multi-beam synthetic aperture imaging sonar zero-degree interference suppression method
  • Downward-looking multi-beam synthetic aperture imaging sonar zero-degree interference suppression method

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Embodiment 1

[0078] Such as figure 1 As shown, Embodiment 1 of the present invention provides a "zero-degree" interference suppression method based on Doppler measurement data and the intensity distribution characteristics of the bottom substrate echo. combine figure 1 The algorithm flow in is processed in the following steps. The method includes:

[0079] 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;

[0080] The geometric model of the down-looking synthetic aperture sonar echo signal is as follows: figure 2 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 squ...

Embodiment 2

[0114] Based on the above method, Embodiment 2 of the present invention proposes a down-looking multi-beam synthetic aperture imaging sonar "zero degree" interference suppression system. The system includes:

[0115] The cylindrical coordinate representation module is used to obtain the echo signal in the cylindrical coordinate system according to the working parameters of the downward-looking multi-beam synthetic aperture imaging sonar system, combined with the downward-looking synthetic aperture three-dimensional imaging sonar signal echo model;

[0116] The pulse compression processing module is used to perform depthwise pulse compression processing on the echo signal in the cylindrical coordinate system to obtain the depthwise imaging signal;

[0117] The beamforming processing module is used to perform cross-direction beamforming processing on depthwise imaging signals to obtain cross-direction beamforming signals;

[0118] The compensation factor calculation module is u...

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Abstract

The invention discloses a downward-looking multi-beam synthetic aperture imaging sonar zero-degree interference suppression method, and the method comprises the steps: obtaining an echo signal under acylindrical coordinate system according to the working parameters of a downward-looking multi-beam synthetic aperture imaging sonar system and by combining a downward-looking synthetic aperture three-dimensional imaging sonar signal echo model; performing depth-direction pulse compression processing on the echo signal under the cylindrical coordinate system to obtain a depth-direction imaging signal; performing cross-course beam forming processing on the depth-direction imaging signal to obtain a cross-course beam forming signal; carrying out calculating to obtain an echo intensity compensation factor according to sonar bottom distance data measured by a Doppler log in combination with the scattering intensity distribution characteristic of the bottom echo signal; carrying out amplitude compensation on the cross-course beam forming signal through the echo intensity compensation factor to suppress zero-degree interference, and obtaining a suppressed cross-course beam signal; and carrying out along-course synthetic aperture processing on the suppressed cross-course beam signal to obtain an along-course imaging result.

Description

technical field [0001] The invention relates to the field of imaging sonar systems, in particular to a "zero degree" interference suppression method for down-looking multi-beam synthetic aperture imaging sonar. Background technique [0002] In the process of high-resolution imaging and detection of underwater targets by downward-looking multi-beam synthetic aperture imaging sonar, the acoustic signal is emitted directly below, and the echo signal is used to image the bottom target. The quality directly transmits the echo component, resulting in a "zero degree" interference phenomenon in the image, and false phenomena in the downward-looking multi-beam imaging results. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of the prior art, and propose a method for suppressing "zero-degree" interference of down-looking multi-beam synthetic aperture imaging sonar, by suppressing the interference of "zero-degree" substrate echo to o...

Claims

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Application Information

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IPC IPC(8): G01S15/89G01S7/537
CPCG01S15/89G01S7/537
Inventor 王朋刘纪元黄海宁
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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