Estimation method of multi-component non-stationary signal instantaneous frequency based on focusing S-transform

A non-stationary signal and instantaneous frequency technology, applied in frequency measurement devices, spectrum analysis/Fourier analysis, etc., can solve the problems of poor time-frequency resolution adjustment, low estimation accuracy of multi-component signals, and low energy aggregation. Achieve high-precision instantaneous frequency estimation, suppress interference, and improve energy aggregation

Active Publication Date: 2015-07-01
XIDIAN UNIV
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[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 en

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  • Estimation method of multi-component non-stationary signal instantaneous frequency based on focusing S-transform
  • Estimation method of multi-component non-stationary signal instantaneous frequency based on focusing S-transform
  • Estimation method of multi-component non-stationary signal instantaneous frequency based on focusing S-transform

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[0032] The technical solutions and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] refer to figure 1 , the implementation steps of the present invention are as follows:

[0034] Step 1, input the time domain form of the non-stationary signal.

[0035] Non-stationary signals, including linear frequency modulation signal, sinusoidal frequency modulation signal, multi-component mixed signal of linear frequency modulation and quadratic frequency modulation, its time domain form is expressed as h(t), where t represents time.

[0036] Step 2, optimize the control parameters of the window function in the focused S-transform according to the aggregation criterion.

[0037] 2a) Perform Fourier transform on the time-domain form h(t) of the non-stationary signal to obtain the frequency-domain form H(f) of the non-stationary signal, where f represents frequency;

[0038] 2b) Setting the initial value of ...

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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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IPC IPC(8): G01R23/02G01R23/16
Inventor 朱明哲姬红兵齐悦张心亮刘靳臧博李林
Owner XIDIAN UNIV
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