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High-precision denoising method for a local ultrasonic array signal

An ultrasonic array and array signal technology, which is applied in the field of denoising, can solve the problems of insignificant denoising effect, influence of array signal processing, and many restrictive conditions, so as to avoid too large error in direction finding positioning, improve denoising effect, and improve The effect of direction finding positioning accuracy

Active Publication Date: 2019-04-05
JIANGSU FRONTIER ELECTRIC TECH +3
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Problems solved by technology

The existing denoising algorithms are mainly divided into two categories. The first category is single signal denoising, such as wavelet denoising, EMD denoising, etc. This type of algorithm only has a better denoising effect on single-channel signals. When using When this method denoises the array signal, it will affect the phase difference between each array signal, which has a significant impact on the processing of the subsequent array signal; the second type is the denoising of the multi-channel array signal. Although this method will not Affects the phase difference of the array signal, but this type of algorithm is mainly based on the principle of blind source separation, there are many restrictions, and the denoising effect is not obvious

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  • High-precision denoising method for a local ultrasonic array signal
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  • High-precision denoising method for a local ultrasonic array signal

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Embodiment Construction

[0040] The present invention will be further described in detail by the following examples. The following examples are to explain the present invention and the present invention is not limited to the following examples.

[0041] like figure 1 As shown, a high-precision denoising method for local ultrasonic array signals of the present invention includes the following steps:

[0042] Step 1: Use the fast independent component FastICA to separate the multi-channel array signal into statistical independent components, perform autocorrelation analysis on these independent components, and initially eliminate the influence of noise;

[0043] Fast Independent Component FastICA is

[0044] Let the PD source signal be S(t)=[S 1 (t),S 2 (t),…S N (t)] T , which is composed of N mutually independent partial discharge signals, and the array signal collected by the array sensor is expressed as follows:

[0045] X(t)=AS(t)+n(t) (1)

[0046] Among them, t is the time variable, X(t) is ...

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Abstract

The invention discloses a high-precision denoising method for a local ultrasonic array signal, which comprises the following steps of: separating a multi-channel array signal into statistical independent components by using a fast independent component Fast ICA, carrying out autocorrelation analysis on the independent components, and preliminarily eliminating the influence of noise; Further denoising the signal of each channel by using an ensemble empirical mode decomposition (EEMD) algorithm; And recombining the signals subjected to fine denoising to obtain high-precision denoised signals. According to the method, the defects that traditional EMD decomposition can only denoise a single sensor and a single channel signal, and FastICA can only roughly denoise an array signal are overcome, too large direction finding and positioning errors caused by interference of on-site noise signals are avoided, and therefore the ultrasonic array signal denoising effect and the direction finding andpositioning precision are improved.

Description

technical field [0001] The invention relates to a denoising method, in particular to a high-precision denoising method for local ultrasonic array signals. Background technique [0002] There is often the influence of noise in the detection of partial discharge ultrasonic array of electrical equipment, so it is necessary to study the denoising algorithm of the signal. The existing denoising algorithms are mainly divided into two categories. The first category is the denoising of a single signal, such as wavelet denoising, EMD denoising, etc. This type of algorithm only has a better denoising effect on single-channel signals. This method will affect the phase difference between each array signal when denoising the array signal, which will have a significant impact on the processing of subsequent array signals; the second type is the denoising of multi-channel array signals, although this method does not It affects the phase difference of the array signal, but this kind of alg...

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Application Information

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IPC IPC(8): G06K9/00G01R31/12
CPCG01R31/1209G06F2218/04
Inventor 马君鹏王成亮亓彦珣吴晗刘叙笔杨贤彪谢庆岳贤强
Owner JIANGSU FRONTIER ELECTRIC TECH
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