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Method for extracting quantity of frequency sources and fundamental frequency values from electromagnetic spectra

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: 2017-02-22
BEIHANG UNIV
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[0006] There is no relevant literature report

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  • Method for extracting quantity of frequency sources and fundamental frequency values from electromagnetic spectra
  • Method for extracting quantity of frequency sources and fundamental frequency values from electromagnetic spectra
  • Method for extracting quantity of frequency sources and fundamental frequency values from electromagnetic spectra

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Embodiment Construction

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

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

[0075] In the present invention, the information received by the test receiver can be transmitted to the data recording computer in a wired manner. The minimum configu...

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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, frequency source quantities and fundamental frequency values ​​in equipment from 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 devices has exploded. These devices will produce some useful or useless electromagnetic emissions during work, which may cause performance degradation and transmission errors of other electronic devices. , control failure, and even seriously threaten the health and safety of personnel, which is extremely harmful, so the electromagnetic interference of the equipment must be controlled. [0003] For electromagnetic compatibility engineers, in order to control the electromagnetic interference of equipment, it i...

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Application Information

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IPC IPC(8): G01R23/167
CPCG01R23/167
Inventor 苏东林尚晓凡刘焱
Owner BEIHANG UNIV
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