Ultrasonic echo signal extraction method based on multi-scale matching tracking

A technology of ultrasonic echo and matching tracking, which is applied in the processing of detection response signals, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, measurement devices, etc., can solve the problems of huge calculation time, limited detection accuracy of weak and small defects, and sparse decomposition algorithm calculations Large volume and other issues

Active Publication Date: 2019-04-16
XIAN UNIV OF SCI & TECH
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Problems solved by technology

However, the above-mentioned existing signal extraction methods, such as nonlinear filtering, Fourier transform and wavelet transform, etc., these methods have a good effect on improving the signal-to-noise ratio of general ultrasonic signals, but for small defects or defects under strong noise background The extraction has limitations, the test results are inaccurate, and the reliability is not high
However, the sparse

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  • Ultrasonic echo signal extraction method based on multi-scale matching tracking
  • Ultrasonic echo signal extraction method based on multi-scale matching tracking
  • Ultrasonic echo signal extraction method based on multi-scale matching tracking

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[0105] like figure 1 A method for extracting ultrasonic echo signals based on multi-scale matching pursuit is shown, comprising the following steps:

[0106]Step 1. Ultrasonic echo signal acquisition and synchronous upload: use the ultrasonic flaw detection device 1 to perform ultrasonic detection on the object under test, obtain the ultrasonic echo signal F(t) of the object under test, and convert the obtained ultrasonic echo signal f( t) synchronously transmitted to the data processing device 2;

[0107] Among them, f(t)=[f(t 1 ), f(t 2 ),...,f(t N )] T , t represents the time parameter, t i is the i-th sampling moment of the ultrasonic flaw detection device 1, f(t i ) is the signal value sampled at the ith sampling time of the ultrasonic flaw detection device 1, i is a positive integer and i=1, 2, 3, ..., N, N is a positive integer and it is the ultrasonic echo signal f(t) signal length;

[0108] Step 2, time-frequency parameter value range compression: use data pro...

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Abstract

The invention discloses an ultrasonic echo signal extraction method based on multi-scale matching tracking. The method comprises the following steps: step one, ultrasonic echo signal acquisition and synchronous uploading; step two, time frequency parameter value range compression: compressing value ranges of time frequency parameters of a Garbo atom used for performing sparse decomposition on a to-be-processed signal f(t) by adopting the data processing equipment, wherein the time frequency parameters comprise a scale parameter, a displacement parameter, a frequency parameter and a phase parameter; step three, signal extraction as follows: step 301, signal sparse decomposition based on optimization algorithm; and step 302, signal reconstruction. The method disclosed by the invention is simple in step, reasonable in design, convenient for realization, and good in use effect; the value range of each parameter in the time frequency parameters is compressed, and then the optimal matching atom is searched by adopting the signal sparse decomposition method based on the optimization algorithm, the signal extraction speed can be greatly accelerated, and the signal extraction precision canbe effectively improved.

Description

technical field [0001] The invention belongs to the technical field of signal time-frequency analysis, and in particular relates to an ultrasonic echo signal extraction method based on multi-scale matching and tracking. Background technique [0002] Time and frequency are the two most important physical quantities to describe a signal, and there is a close relationship between the time domain and the frequency domain of a signal. Time-Frequency Analysis (JTFA), short for Joint Time-Frequency Analysis, is a powerful tool for analyzing time-varying non-stationary signals and is an emerging signal processing method. The time-frequency analysis method provides the joint distribution information of the time domain (referred to as the time domain) and the frequency domain (referred to as the frequency domain), and clearly describes the relationship of the signal frequency with time. [0003] At present, most of the signals collected by the signal sampling system (also called sign...

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Application Information

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IPC IPC(8): G01N29/44
CPCG01N29/4472
Inventor 齐爱玲张广明马宏伟张旭辉曹现刚
Owner XIAN UNIV OF SCI & TECH
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