Instantaneous frequency measurement method based on adaptive filtration theory

A technology of adaptive filtering and adaptive filter, which is applied in the direction of frequency measuring device, measuring device, measuring electrical variables, etc., to achieve the effect of eliminating noise interference

Inactive Publication Date: 2010-10-13
XIDIAN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the existing methods of instantaneous frequency meas

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  • Instantaneous frequency measurement method based on adaptive filtration theory
  • Instantaneous frequency measurement method based on adaptive filtration theory
  • Instantaneous frequency measurement method based on adaptive filtration theory

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[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] figure 2 is the input non-stationary multi-frequency component signal S, and its signal expression is

[0036] S ( t ) = sin ( f 1 * 2 πt / f s ) + sin ( f 2 * 2 πt / f ...

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Abstract

The invention discloses an instantaneous frequency measurement method based on the adaptive filtration theory. The adaptive filtering algorithm is utilized to decompose a nonstationary multi-frequency component signal into a plurality of progressive single-frequency signals to be measured, thus solving the analyzing problem of the multi-frequency component signal. The Hilbert transformation is adopted to perform instantaneous frequency measurement to the progressive single-frequency signals, thus complete and accurate instantaneous physical quantity of the nonstationary multi-frequency component signal can be obtained, the time-frequency distribution of the nonstationary signal can be further obtained and the requirements of instantaneous frequency measurement in the fields of military communication and electronic countermeasure can be satisfied.

Description

technical field [0001] The invention relates to a method for measuring the instantaneous frequency of a non-stationary multi-frequency component signal, in particular to a method for measuring the instantaneous frequency based on the principle of self-adaptive filtering. Background technique [0002] Instantaneous frequency measurement technology is very important in military applications and is widely used in military communications and electronic countermeasures. In the field of instantaneous frequency measurement, the current application is to measure non-stationary multi-frequency component signals. Among the methods commonly used to deal with non-stationary signals at present, wavelet transform is a good time and frequency analysis tool, which can solve the problem that the signal cannot be expressed simultaneously in the time domain and frequency domain in Fourier analysis. However, due to energy leakage and other reasons, wavelet transform will appear aliasing and ph...

Claims

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Application Information

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IPC IPC(8): G01R23/02G01R23/165
Inventor 王海范文晶宣宗强孟繁杰刘凯王召利
Owner XIDIAN UNIV
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