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

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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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 decomposition algorithm has two defects. One is that the sparse decomposition algorithm has a large amount of calculation, and the calculation time is very large under the current computing conditions, so it cannot be detected in real time; the other is that the sparse decomposition algorithm is the optimal solution under continuous conditions. solution, the detection accuracy for weak and small defects is still limited

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