Correction Method of Discrete Spectrum Low Frequency Components Based on Time Delay

A discrete spectrum and time delay technology, applied in the field of discrete spectrum low-frequency component correction, can solve the problems of complex correction algorithm and large amount of calculation, and achieve the effect of high correction accuracy, small amount of calculation and high precision

Active Publication Date: 2011-12-07
BEIJING UNIV OF CHEM TECH
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the document "Acta Metrology" 2008.29(2): pp. 168-171, the authors Zhang Haitao and Tu Yaqing proposed a low-frequency correction method based on phase difference in the article "A New Method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Correction Method of Discrete Spectrum Low Frequency Components Based on Time Delay
  • Correction Method of Discrete Spectrum Low Frequency Components Based on Time Delay
  • Correction Method of Discrete Spectrum Low Frequency Components Based on Time Delay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] The present invention is further described below in conjunction with embodiment. The scope of the present invention is not limited by these Examples. Content of the present invention is described in further detail as follows in conjunction with accompanying drawing:

[0045] 1) Divide the discrete-time signal into three segments of equal length according to a certain time delay, and sum each segment of the time signal separately to obtain three summation values;

[0046] 2) Utilizing the symmetry of the discrete-time signal spectrum, starting from the Fourier transform formula, deduce the spectrum correction formula of the low-frequency component of the discrete spectrum;

[0047] 3) Bring the three summation values ​​into the spectrum correction formula to obtain the correction value of the amplitude, frequency and phase of the low frequency components in the discrete spectrum.

[0048] The time window function is generally a real even function, that is, w(t)=w(-t), an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for correcting low-frequency components in a discrete spectrum based on time delay, which is characterized by comprising the following steps: (1) dividing a discrete time signal into three equilong sections according to a certain time delay, summating each section of the time signal respectively and getting three sums; (2) utilizing the symmetry of the spectrum of the discrete time signal and utilizing a Fourier transform formula to get an expression form about the spectrum correction of the low-frequency components in the discrete spectrum; (3) combining the three sums with the expression form about the spectrum correction of the low-frequency components in the discrete spectrum for getting the frequency and the phase of the low-frequency components in the discrete spectrum; and combining with the expression form about the spectrum correction (2) according to the obtained frequency and the phase and further getting the amplitude of the low-frequency components; and (4) correcting the phase and getting the corrected value of the phase. The method is small in amount of calculation, high in calculation accuracy, simple and easy to operate and applicable to any window functions, and can improve the efficiency and the accuracy of the correction of the low-frequency components in the discrete spectrum.

Description

technical field [0001] The present invention relates to a method for correcting low-frequency components of discrete spectrum, in particular to a method for correcting low-frequency components of discrete spectrum based on time delay. Background technique [0002] In the field of spectrum correction, the signal frequency is relative. When the frequency is less than twice the frequency resolution of the spectrum, it is regarded as a low-frequency signal, otherwise it is regarded as a high-frequency signal. For example, for a 30Hz single-frequency signal, if the frequency resolution is 20Hz, the signal should be regarded as a low-frequency signal in the field of spectrum correction; if the frequency resolution is 1Hz, the signal should be regarded as a high-frequency signal in the field of spectrum correction. [0003] In engineering practice, for low-frequency signals, there are not enough fluctuation cycles in the collected samples, and the spectrum will be interfered by neg...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R35/00G01R23/16
Inventor 江志农冯坤秦强何威马波
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap