Near-field model amplitude-phase error calibration method for a transducer array of a phased array three-dimensional camera shooting sonar system

A transducer array and three-dimensional imaging technology, which is applied in the direction of sound wave reradiation, radio wave measurement system, instrument, etc., can solve the problems of heavy calculation burden and unfavorable field application, so as to avoid spectral peak search, improve imaging quality and Probe performance, demand reduction effects

Pending Publication Date: 2022-02-18
ZHEJIANG UNIV
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Problems solved by technology

For phased-array three-dimensional camera-sonar systems containing thousands of elements, the computational burden of such methods is very high, which is not conducive to field application

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  • Near-field model amplitude-phase error calibration method for a transducer array of a phased array three-dimensional camera shooting sonar system
  • Near-field model amplitude-phase error calibration method for a transducer array of a phased array three-dimensional camera shooting sonar system
  • Near-field model amplitude-phase error calibration method for a transducer array of a phased array three-dimensional camera shooting sonar system

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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0030] figure 2 It is a schematic flowchart of a method for calibrating amplitude and phase errors of a near-field model of a transducer array of a phased array three-dimensional camera sonar system provided by an embodiment. like figure 2 As shown, the near-field model amplitude and phase error calibration method provided by the embodiment includes the following steps:

[0031] Step 1. Preprocess the sampled snapshot signals corresponding to the k array responses of the two-dimensional transducer array to obtain the virtual two-dimensional array response R x and R ...

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Abstract

The invention discloses a near-field model amplitude-phase error calibration method for a transducer array of a phased array three-dimensional camera shooting sonar system. The method comprises the following steps: preprocessing an array response signal to obtain a new virtual array response; carrying out discrete phase transformation to obtain a reduced-order array; processing the reduced-order array by using fast Fourier transform, and roughly estimating a normalized frequency modulation rate; improving the estimation precision by adopting three-step iterative calculation; demodulating the response of the virtual array by using the estimated value of the normalized modulation rate; processing the demodulation array by using fast Fourier transform, and roughly estimating a normalized angular frequency; improving the estimation precision by adopting three-step iterative calculation; estimating an amplitude-phase error factor by adopting a space domain matched filtering algorithm based on the existing estimated value; and compensating a sampling signal by using an estimation result, and finally obtaining a calibrated three-dimensional image through a digital beam forming algorithm. According to the method, only one calibration source with an unknown orientation is used, and no far-field requirement exists; a large amount of spectrum peak search is avoided, and the method is suitable for rapid calibration of a large transducer array.

Description

technical field [0001] The invention relates to the technical field of a phased array three-dimensional camera sonar system, in particular to a near-field model amplitude and phase error calibration method of a transducer array of a phased array three-dimensional camera sonar system. Background technique [0002] The phased array 3D camera sonar system uses a narrow-band acoustic pulse to transmit the entire underwater scene, and uses a two-dimensional uniform rectangular transducer array to receive the backscatter echo signal in the scene to generate an array response signal. These array response signals can be processed by beamforming technology and real-time image processing technology to obtain high-resolution underwater three-dimensional images. [0003] In order to improve the resolution of the image while maintaining a large detection angle of view, the two-dimensional uniform rectangular transducer array usually has a large aperture and contains thousands of array el...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/89G01S7/52
CPCG01S15/89G01S7/52004
Inventor 蒋荣欣田翔王斐辜博轩陈耀武
Owner ZHEJIANG UNIV
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