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
CN104007318AActive Publication Date: 2014-08-27INST OF ELECTRONICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF ELECTRONICS CHINESE ACAD OF SCI
Publication Date
2014-08-27

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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.
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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...

Claims

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