Multicomponent nonstationary signal instantaneous frequency estimation method based on focused s-transform

Abstract

The invention discloses an estimation method of a multi-component non-stationary signal instantaneous frequency based on focusing S-transform, and mainly solves the problems that the multi-component non-stationary signal instantaneous frequency with high precision cannot be realized because the energy aggregation is not high and the time frequency resolution ratio cannot be flexible to adjust and cannot realize high precision. The estimation method comprises the realizing steps: 1, inputting a to-be-analyzed non-stationary signal; 2, optimizing a control parameter of a window function in the focusing S-transform according to an aggregation criterion; 3, calculating the optimized focusing S-transform and acquiring a signal time frequency distribution energy diagram; 4, carrying out binarization processing on the time frequency distribution energy diagram of the non-stationary signal; and 5, obtaining the instantaneous frequency estimation on a signal according to a binaryzation time frequency diagram after the binarization processing. According to the method provided by the invention, the self-adaption adjustment of the control parameter of the window function can be realized by improving the S-transform window function, and the time frequency distribution energy aggregation and the instantaneous frequency estimation accuracy can be improved, therefore the method can be used for radar interception, communication countermeasure, voice identification, and medical brain wave signal analysis.

Description

technical field [0001] The invention belongs to the technical field of signal and information processing, and in particular relates to an instantaneous frequency estimation method, which can be used for radar interception, communication confrontation, voice recognition, and medical brain wave signal analysis. Background technique [0002] Non-stationary signals, such as radar signals, communication signals, voice signals, etc., are ubiquitous in practical engineering applications, and their commonality is that they have time-varying frequency characteristics. The traditional Fourier transform FT is aimed at periodic stationary signals and cannot reflect the local characteristics of non-stationary signals. Therefore, when analyzing the structural characteristics of such signals, it is necessary to use the instantaneous frequency IF estimation method. When the intercepted non-stationary signal enters the signal analysis system, the instantaneous frequency IF estimation can ch...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for instantaneous frequency estimation of multi-component non-stationary signals based on focused S-transform, so as to solve the problem of low energy aggregation and time-frequency resolution adjustment in the prior art for instantaneous frequency estimation of such signals. Defects that are poor and have low estimation accuracy for multi-component signals

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