Signal time-frequency function obtaining method

A signal and function technology, applied in the field of signal time-frequency function acquisition, can solve the problems of limited accuracy of the algorithm, not very concentrated self-items, and inability to meet high precision, etc., to achieve good time-frequency aggregation effect

Active Publication Date: 2014-08-27
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 object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the...

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Abstract

The invention provides a signal time-frequency function obtaining method. According to the method, fractional Fourier transformation and WVD transformation are combined together, fractional Fourier transformation can overcome the defects of traditional STFT and has good time-frequency aggregation on linear frequency modulation signals particularly, therefore, the method has special advantages when time-frequency analysis is conducted on unstable signals, and fractional Fourier transformation has no cross-term interference. On the basis of the reasons, the method has the advantages of being high in calculation accuracy, high in anti-noise performance and the like and can be applied to the various fields such as earthquake detection, sonar detection and vibration detection.

Description

technical field [0001] The invention relates to the technical field of signal processing in the electronic industry, in particular to a method for obtaining a time-frequency function of a signal. 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 time-frequency function of the signal is called time-frequency analysis in the art. The time-frequency function of the signal is calculated for 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. The time-frequency analysis of non-stationary signals is also widely used in many fields such as earthquake, so...

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Application Information

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Patent Type & Authority Applications(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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