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
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[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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