Background signal eliminating method suitable for on-site electromagnetic interference detection

A background signal, electromagnetic interference technology, applied in the measurement of interference from external sources, measurement of electricity, measurement devices, etc., can solve the problem of high cost and uniform noise environment of dual-channel receivers that are difficult to meet, and achieve simple and reduced test equipment. Impact, low cost effect

Active Publication Date: 2016-08-10
BEIHANG UNIV
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Problems solved by technology

Simultaneous measurement requires simultaneous acquisition of a mixture of background noise and EUT radiated signals. This method requires the use of a dual-channel receiv

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  • Background signal eliminating method suitable for on-site electromagnetic interference detection
  • Background signal eliminating method suitable for on-site electromagnetic interference detection
  • Background signal eliminating method suitable for on-site electromagnetic interference detection

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Embodiment Construction

[0028] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0029] The present invention is a background signal elimination method suitable for on-site electromagnetic interference detection, the process is as follows Figure 7 shown, including the following steps:

[0030] Step 1: Connect the receiving antenna and the spectrum analyzer through the RF cable, such as figure 1 , set the spectrum analyzer to work in the maximum hold mode;

[0031] Step 2: Turn off the EUT, put the spectrum analyzer in the maximum hold mode, collect the background noise at T1 time, and obtain a relatively stable background noise E, such as image 3 ;

[0032] Step 3: Turn on the EUT, put the spectrum analyzer in the maximum hold mode, collect T1 time, and obtain the mixed signal M of the electromagnetic emission and background noise of the EUT, such as Figure 4 ;

[0033] Step 4: Disconnect the RF cable from the spectrum ana...

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Abstract

The invention discloses a background signal eliminating method suitable for on-site electromagnetic interference detection. The detection can be completed with simple devices including a portable frequency spectrograph and an antenna, background noise in a period of time is acquired with a maximal retaining mode, EUT electromagnetic emission and environment mixed signals are acquired when a device to be detected is powered on, and the EUT electromagnetic emission is obtained through a frequency domain adaptive filtering algorithm. The background noise, mixed signals and other frequency spectrum data are acquired in the maximal retaining mode, so that the influence caused by unstable background noise can be minimized. After the mixed signals and background noise are inputted into an adaptive digital filter, the EUT electromagnetic emission frequency points are obtained from the output signals, and the amplitude value of each EUT electromagnetic emission frequency point is obtained from the mixed signals. Other frequency point uses the ground noise of the frequency spectrum analyzer as the amplitude value after eliminating background signals.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic interference detection, and in particular relates to a background signal elimination method suitable for on-site electromagnetic interference detection. Background technique [0002] In order to avoid the influence of the external environment, electromagnetic interference detection is usually carried out in a microwave anechoic room or a dedicated open field. However, with the development of communication and the expansion of human activities, it is difficult to find an ideal open field. However, the cost of the darkroom is very high. In addition, some tests need to be carried out on the site where the equipment is used, because some equipment is large or needs to work with other equipment. If it is done in the darkroom, corresponding test products are required. So now more and more people are studying how to measure electromagnetic interference in the field of equipment use. However, th...

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/001
Inventor 李圆圆谢树果
Owner BEIHANG UNIV
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