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Digital Signal Post-processing Method Based on Time-Frequency Analysis

A time-frequency analysis, digital signal technology, applied in signal pattern recognition, character and pattern recognition, instruments, etc., can solve problems such as low efficiency, defect detection and analysis methods, and low accuracy

Active Publication Date: 2020-03-17
YUNNAN AEROSPACE ENG GEOPHYSICAL SURVEY INSPECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the traditional signal processing methods have great limitations
In addition, the traditional analysis method based on signal feature extraction has the disadvantages of low precision and low efficiency due to the limitation of the type of signal feature extracted.

Method used

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  • Digital Signal Post-processing Method Based on Time-Frequency Analysis
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Embodiment Construction

[0047] In order to make the technical problems, technical solutions and beneficial effects solved by 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, not to limit the present invention.

[0048] The invention provides a digital signal post-processing method based on time-frequency analysis, which extracts more characteristic information of the signal from the signal after time-frequency analysis, thereby facilitating defect detection and analysis. Specifically, the method calculates the ratio of the FWHM energy of the main frequency component at each moment to the total energy at that moment after the time-frequency analysis, and then draws the FWHM energy ratio curve of the main frequency of the entire digital signal. By analyzing the main frequency half...

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Abstract

The invention provides a digital signal post-processing method based on time-frequency analysis, comprising the following steps: obtaining the physical property waveform signal of the detected object; performing time-frequency analysis on the physical property waveform signal by using a time-frequency analysis method to obtain a two-dimensional time-frequency Analyzing the results; analyzing the FWHM energy ratio of the main frequency signal at any time in the two-dimensional time-frequency analysis results to obtain the FWHM energy ratio of the frequency spectrum at any time; Wide energy ratio, taking the time as the abscissa, and taking the full width at half maximum energy ratio as the ordinate, draw the full width at half maximum energy ratio curve of the entire signal; Analyze to obtain the detection result of the detected object. The advantages are: it can evaluate the internal defect of the detected object with high precision, reliability, simplicity and speed, and it is a technical means that can be widely used.

Description

technical field [0001] The invention belongs to the technical field of signal post-processing, and in particular relates to a digital signal post-processing method based on time-frequency analysis. Background technique [0002] Non-destructive testing refers to the use of thermal, sound, light, electrical, magnetic and other changes in the internal structure of the material caused by abnormalities or defects on the premise of not damaging or affecting the performance of the tested object or the internal tissue of the tested object. , by means of physical or chemical methods, with the help of modern technology and equipment, to inspect the structure, nature, state and type, nature, quantity, shape, position, size, distribution and changes of the internal and surface of the test piece and test methods. [0003] In bridges, tunnels, highways and other projects, it is often necessary to perform non-damage detection on anchor rods, steel cages, foundation piles, inverted arch st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06F2218/14G06F2218/10
Inventor 苏建坤
Owner YUNNAN AEROSPACE ENG GEOPHYSICAL SURVEY INSPECTION