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Frequency Adaptive Signal Analysis Method

A signal analysis method and frequency adaptive technology, applied in the field of signal analysis

Inactive Publication Date: 2014-10-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a frequency adaptive signal analysis method to solve the problem that the signal analysis method in the prior art cannot meet the requirements of easy application in computer systems, high precision and fast convergence speed, and easy software problem of programming

Method used

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Embodiment 1

[0058] figure 1 It is a schematic flow chart of the frequency adaptive signal analysis method in Embodiment 1 of the present invention. The frequency adaptive signal analysis method in Embodiment 1 is an offline analysis implementation mode, which is suitable for analyzing the measured data obtained by periodic sampling stored in a storage device. A discrete time series of signals.

[0059] The feature of the off-line analysis implementation is that the sampling and analysis calculations are performed separately. First, take T seconds as the sampling period, regularly sample the measured signal, store the sampled data in the storage device, form a discrete time series with K data, and then analyze and calculate the discrete time series.

[0060] Such as figure 1 As shown, in the frequency adaptive signal analysis method of Embodiment 1, the analysis and calculation process includes an initialization step and a data processing step, wherein the data processing step includes t...

Embodiment 2

[0065] figure 2 It is a schematic flow chart of the frequency adaptive signal analysis method in Embodiment 2 of the present invention. The frequency adaptive signal analysis method in Embodiment 2 is an online analysis implementation, which is suitable for real-time analysis and processing of each sampled data of the measured signal. The feature of the online analysis implementation is to analyze and calculate while sampling, that is, to perform an analysis and calculation every time a piece of data is sampled.

[0066] Such as figure 2 As shown, the frequency adaptive signal analysis method in Embodiment 2 includes a main step and a timing interruption step.

[0067] The main step includes an initialization step and a main loop step that implements other functions. In the initialization step, first set the parameters N, β 1 , β 2 ,...,β 2N-1 , β 2N , μ, γ, ε values, set the DC component x 0 , AC component x 1 、x 2 ,...,x N , the orthogonal component z 1 ,z 2 ,…...

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Abstract

The invention discloses a method for analyzing frequency adaptive signals. The method comprises the following steps of: performing timing sampling and quantification on measured signals by taking T seconds as a sampling period to obtain sample data; setting the value of the number N of alternating-current components; directly acquiring a direct-current component x0 through iteration; directly acquiring estimated frequencies omega1, omega2,..., omegaN, alternating-current components x1, x2,..., xN and orthogonal components z1, z2,..., zN through a discrete frequency estimation algorithm; and calculating estimated amplitudes a1, a2,..., aN. According to the method for analyzing the frequency adaptive signals, because an iterative method is adopted to perform signal analysis, the method can be easily applied to computer systems, and has high accuracy and high convergence rate.

Description

technical field [0001] The invention belongs to the technical field of signal analysis, in particular to a signal analysis method for decomposing a signal into a DC component and a plurality of AC components, and obtaining the orthogonal component, frequency and amplitude of each AC component. Background technique [0002] In engineering, it is often necessary to decompose signals such as voltage, current, sound, and vibration into DC components and multiple AC components, and calculate the value of the DC component and the frequency and amplitude of each AC component, such as the harmonics and interharmonics of the power system Wave analysis and vibration component analysis of mechanical vibration, etc. [0003] For this reason, several signal analysis methods based on frequency estimation have been proposed in the prior art. Although these methods can obtain better decomposition results to a certain extent, they still have certain deficiencies, such as: [0004] Signal an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16G01R23/02
Inventor 储昭碧李鑫陈梅冯小英
Owner HEFEI UNIV OF TECH