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Method for background noise removal by electromagnetic measuring technology

A background noise, electromagnetic measurement technology, applied in the direction of electromagnetic field characteristics, etc., can solve the problems of inability to determine the influence of the high-voltage transmission line under test, inability to identify and distinguish, and difficult to assess and manage the environmental impact of electromagnetic radiation.

Inactive Publication Date: 2013-07-17
ZHENGZHOU UNIV
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Problems solved by technology

This background noise interference has the same frequency as the electromagnetic radiation of the device under test, and the measuring receiver or spectrum analyzer cannot identify and distinguish which is the background noise and which is the electromagnetic radiation of the device under test
Therefore, the results measured by the measuring receiver or spectrum analyzer are the comprehensive field strength of the electromagnetic radiation of the radiation source under test and the background noise, and the electromagnetic radiation field strength of the radiation source under test cannot be accurately measured.
[0003] At present, when evaluating the environmental impact of electromagnetic radiation on high-voltage transmission lines in many places in China, it is found that due to the influence of surrounding background electromagnetic noise, the measurement results exceed the national standard.
In this case, it is impossible to determine the impact of the measured high-voltage transmission line on the electromagnetic radiation environment by using the existing measurement equipment and technology, which brings great difficulties to the evaluation and management of the impact of the electromagnetic radiation environment

Method used

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  • Method for background noise removal by electromagnetic measuring technology
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  • Method for background noise removal by electromagnetic measuring technology

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 , 2 , 3, and 4, in the detection of electromagnetic radiation environment, the method for eliminating background noise includes the following process steps:

[0040] Step 1: Set the background noise to be random and irrelevant to the measured signal; and the noise source is far away from the measurement area, and the electric field strength of the noise at each point in the measurement area is approximately uniform.

[0041] Step 2: In the measurement area, set 3 test points P along a certain direction of the radiation source to be tested 1 ,P 2 ,P 3 ;Such as figure 2 As shown, the high-voltage transmission line is a line radiation source, so P 1 ,P 2 ,P 3 Set along the direction perpendicular to the high-voltage transmission line. When it is necessary to detect point radiation sources, such as figure 1 The method shown sets...

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Abstract

The invention particularly relates to a method for background noise removal by an electromagnetic measuring technology. The method belongs to the technical field of the electromagnetic environment detection and comprises synchronously performing electromagnetic radiation field intensity detection on different detection points along the same direction of radiation source through a detection system which is formed by three same detecting devices; measuring comprehensive field intensity of electromagnetic radiation field intensity and noise field intensity; utilizing a data processing program of the detection system to obtain noise field intensity; and calculating electromagnetic radiation field intensity after noise is eliminated. Accordingly, the method for the background noise removal by the electromagnetic measuring technology has the advantages of enabling measuring results to be accurate and guaranteeing accurate and reliable electromagnetic radiation environmental assessments.

Description

Technical field: [0001] The invention belongs to the technical field of electromagnetic environment detection, and in particular relates to a method for removing background noise by using electromagnetic measurement technology. Background technique: [0002] To measure electromagnetic radiation, a measuring receiver or a calibrated spectrum analyzer is generally used. These are all frequency-selective devices. For example, when measuring the electromagnetic environment near a large electromagnetic radiation source, when measuring at a certain frequency, the same-frequency signal in the background noise has a great influence on the accuracy of the measurement results. This background noise interference has the same frequency as the electromagnetic radiation of the device under test, and the measurement receiver or spectrum analyzer cannot identify and distinguish which is the background noise and which is the electromagnetic radiation of the device under test. Therefore, the...

Claims

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Application Information

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IPC IPC(8): G01R29/08
Inventor 邹澎马力刘平周晓平
Owner ZHENGZHOU UNIV
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