Noise identification method in power line carrier communication fault detection system

A carrier communication and fault detection technology, which is applied in the distribution line transmission system, wired transmission system, transmission system, etc., can solve the problems of low identification accuracy, inability to accurately identify the carrier signal, cumbersome steps, etc., and achieve the suppression of radiation noise Effect

Active Publication Date: 2014-07-23
江苏益邦电力科技有限公司
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Problems solved by technology

At present, most of the existing noise identification methods have cumbersome steps and relatively low identification accuracy, and cannot accurately identify the carrier signal that causes the radiation noise to exceed the standard

Method used

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  • Noise identification method in power line carrier communication fault detection system
  • Noise identification method in power line carrier communication fault detection system
  • Noise identification method in power line carrier communication fault detection system

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the drawings.

[0035] Step 1: Place the device under test, oscilloscope, 4 magnetic field probes (the number of probes M depends on the number of source signals N, M≥N), and wire connections on the test bench in the 3m anechoic chamber. The 4 magnetic field probes of the device under test are measured. Group near-field time-domain signals and export them, such as figure 2 As shown; or generate 4 sets of near-field time-domain signals in Matlab, such as image 3 Shown

[0036] Step 2: Combine the above 4 sets of near-field time domain signals x i (t),i=1,2,3,4, form the column vector x(t)=[x 1 (t),x 2 (t),x 3 (t),x 4 (t)] T As an observation signal;

[0037] Step 3: Perform independent component analysis on the observation signal x(t):

[0038] First, perform whitening preprocessing on the observation signal x(t). Use the principal component analysis method to remove the correlation between the signal s...

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Abstract

The invention discloses a noise identification method in a power line carrier communication fault detection system and belongs to the technical field of electromagnetic compatibility technologies. M sets of measured near field time domain signals of a detected device form an observation signal x(t) used for a matrix, the observation signal x(t) is subjected to independent component analysis, in other words, a separation matrix W is searched for, the y=Wx is made to have highest Gaussianity, after whitening processing is performed, the x(t) is substituted into a Newton iterative formula and separated into M independent near field time domain signals, and waveforms of the M independent near field time domain signals are compared with those of far field time domain signals of the detected device so that signals causing standard exceeding of radiation noise can be determined. The method is simple, efficient and systematized better, frequency points of standard exceeding radiation noise to detected products can be accurately recognized, and therefore a radiation source can be rectified and reformed in a targeted mode, and radiation noise of the radiation source is suppressed.

Description

Technical field [0001] The invention relates to a noise identification method in a communication fault detection system, in particular to a noise identification method in a power line carrier communication fault detection system, and belongs to the technical field of electromagnetic compatibility. technical background [0002] With the widespread use of high-speed digital chips, switching devices, and wireless communication modules, a large amount of electronic noise spreads in space in the form of electromagnetic fields, and the resulting electromagnetic compatibility problems are becoming more and more complicated, which seriously affects the normal operation of other equipment. Various domestic and foreign standards also clearly stipulate that various electronic equipment must pass the radiation noise standard test before being sold. In order to solve the problem of excessive noise in the detection of radiated noise of electronic equipment, the problem of radiated noise must b...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B3/54H04B3/462
Inventor 赵俊平夏欢王一凡舒国伟
Owner 江苏益邦电力科技有限公司
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