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A method for extracting frequency source quantity and fundamental frequency value from electromagnetic spectrum

A technology of frequency source and spectrum data, applied in spectrum analysis, measurement of electrical variables, measurement devices, etc., can solve problems such as unexamined

Active Publication Date: 2018-02-02
BEIHANG UNIV
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  • Abstract
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  • Application Information

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[0006] There is no relevant literature report

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  • A method for extracting frequency source quantity and fundamental frequency value from electromagnetic spectrum
  • A method for extracting frequency source quantity and fundamental frequency value from electromagnetic spectrum
  • A method for extracting frequency source quantity and fundamental frequency value from electromagnetic spectrum

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Embodiment Construction

[0073] The present invention will be further described in detail below with reference to the drawings and examples.

[0074] The typical test configuration is attached figure 1 As shown, electromagnetic interference testing can generally be divided into two types: "conducted emission test" and "radiated emission test". Conducted emission test uses current probe, linear impedance network and measuring receiver as the main instruments. Possible conducted emission signals are measured. The radiation emission test refers to the use of different types of antennas and measurement receivers as the main instruments to measure the radiation emission signals that the equipment may radiate into space. The above-mentioned test process also requires a data recording device (computer), and the measuring receiver is respectively connected with the receiving antenna (or linear impedance network) and the computer in a wired manner.

[0075] In the present invention, the information received by th...

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Abstract

The invention relates to a method for extracting the quantity of frequency sources and fundamental frequency values from electromagnetic spectra. The method comprises the steps of firstly acquiring transmitted spectrum data of detected equipment, and obtaining harmonic components of the transmitted spectrum data by using a multi-resolution analysis method; secondly, calculating an autocorrelation sequence of the harmonic components, extracting an alternative fundamental frequency value from the autocorrelation sequence, and simultaneously setting the harmonic corresponding to the alternative fundamental frequency value in the harmonic components to be 0; thirdly, checking the validity of the alternative fundamental frequency value by using a variance analysis method; if valid, marking the alternative fundamental frequency value as a valid fundamental frequency value, otherwise, deleting the alternative fundamental frequency value; fourthly, recalculating the autocorrelation sequence of the harmonic components, and repeating the above steps till determining no new frequency source included; and finally, removing the repeated results from the valid fundamental frequency values, counting and outputting the valid fundamental frequency values, wherein if the valid fundamental frequency values are equal to the working frequency of a certain component, the source of harmonic in the spectrum data can be found, and electromagnetic compatibility design and reform of the detected equipment can be guided.

Description

Technical field [0001] The invention relates to a method for extracting harmonic components and the number of frequency sources and fundamental frequency values ​​in equipment from the electromagnetic interference emission spectrum, and belongs to the technical field of electromagnetic compatibility. Background technique [0002] With the advancement of electronic technology and the vigorous development of the electronic information industry, the number of electrical and electronic equipment has exploded. These equipment will produce some useful or useless electromagnetic emissions when they are working, which may cause other electronic equipment performance degradation and transmission errors. , Control failure, and even seriously threaten the health and safety of personnel, and cause great harm. Therefore, the electromagnetic interference of the equipment must be controlled. [0003] For electromagnetic compatibility engineers, to control the electromagnetic interference of the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/167
CPCG01R23/167
Inventor 苏东林尚晓凡贾云峰刘焱
Owner BEIHANG UNIV
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