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The method of obtaining the time-frequency function of the signal

A signal and function technology, applied in the field of obtaining signal time-frequency function, can solve the problems of limited algorithm accuracy, self-term is not very concentrated, STFT can not accurately calculate the frequency, etc., to achieve the effect of good time-frequency aggregation

Active Publication Date: 2016-11-09
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] However, when using the existing STFT for time-frequency analysis of signals, although there is no interference from cross-terms, its self-terms are not very concentrated, and the spectral bandwidth of its Fourier transform is wide, so STFT cannot accurately calculate the corresponding time frequency, so there will be a large calculation error
In addition, there are some time-frequency analysis methods whose algorithm accuracy is limited and cannot meet some high-precision requirements

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[0022] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that in the drawings or description of the specification, similar or identical parts use the same drawing numbers. The implementations not shown or described in the drawings are those known to those of ordinary skill in the art. In addition, although this article may provide an example of a parameter containing a specific value, it should be understood that the parameter does not need to be exactly equal to the corresponding value, but can be approximated to the corresponding value within acceptable error tolerances or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only directions with reference to the draw...

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Abstract

The invention provides a method for obtaining the time-frequency function of a signal. This method combines fractional Fourier transform and WVD transform. Among them, fractional Fourier transform can overcome the shortcomings of traditional STFT. Fractional Fourier transform has good time-frequency aggregation especially for linear frequency modulation signals. Therefore, it has special advantages in time-frequency analysis of non-stationary signals, and there is no cross-term interference in the fractional Fourier transform. Based on the above reasons, the present invention has the advantages of high calculation accuracy and strong anti-noise performance, and can be used in many fields such as earthquake, sonar, and vibration detection.

Description

Technical field [0001] The invention relates to the technical field of signal processing in the electronics industry, and in particular to a method for obtaining a signal time-frequency function. Background technique [0002] Signals in modern signal processing generally have time parameters and frequency parameters. For non-stationary signals, that is, the frequency of the signal may change with time. At this time, the time and frequency parameters are converted into time-frequency functions, referred to as time-frequency functions. The method of obtaining the signal time-frequency function is called time-frequency analysis in the art. Calculate the time frequency function of the radar signal, which can be used to check the linearity of the signal, separate the components of the signal, and calculate the Doppler frequency of the signal. Time-frequency analysis of non-stationary signals is also widely used in many fields such as earthquake, sonar, and vibration detection. Ther...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/165G01R23/20
Inventor 刘小军张文鑫陈秀伟柳青赵博唐传军张锋方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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