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EMD method and device capable of being used for processing signals in real time

A real-time processing and signal technology, applied in the field of signal processing, can solve problems such as inability to perform online detection, and achieve the effects of avoiding computational consumption, improving real-time performance, and improving computational efficiency

Pending Publication Date: 2020-06-05
GUANGDONG POLYTECHNIC NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when applying the EMD method, due to the need to use poles to fit the upper and lower envelopes, EMD can only be applied to offline data processing at present, and cannot be used for online detection.

Method used

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  • EMD method and device capable of being used for processing signals in real time
  • EMD method and device capable of being used for processing signals in real time
  • EMD method and device capable of being used for processing signals in real time

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Experimental program
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Embodiment 1

[0055] Such as figure 1 , 2 As shown, this embodiment provides an EMD method that can be used to process signals in real time, and the method can be applied to fields such as machinery, medicine, and energy, and the real-time signal processing can be realized by using this method.

[0056] Each step of the method will be specifically described below with reference to the accompanying drawings.

[0057] 1. Obtain data.

[0058] The data register and the modal decomposition register are set in the system, the data register is used to store the data collected in real time, and the modal decomposition register is used to store the signal data for EMD decomposition.

[0059] Before collecting data, first set the sampling frequency Fs, the short-term period length Ta, initialize the short-term period count p to 1, and set the number of times N to add white noise.

[0060] In the process of collecting data, the data is sequentially read into the data register according to the time...

Embodiment 2

[0099] This embodiment provides an EMD device that can be used for real-time signal processing, and the structure of the device can be found in image 3 ,include:

[0100] The acquisition module is used for real-time acquisition of signal data;

[0101] The periodic data extraction module is used to extract the periodic data after the received data reaches the set period length value, and send the periodic data to the periodic data extension module;

[0102] The periodic data extension module is used to extend the start and end of the currently obtained periodic data respectively;

[0103] The EMD decomposition module is used to perform EMD decomposition on the extended periodic data to obtain imf(k,i,p), k represents the order of the imf function of the current cycle EMD decomposition, i represents the order of data points in the imf function, and p represents the current number of data cycles processed;

[0104] The real-time result fusion module is used to fuse the corre...

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Abstract

The invention discloses an EMD method and device capable of being used for processing signals in real time. The method comprises the steps: collecting signal data in real time; presetting a period length, and extracting the period data after the received data reaches a set period length value; extending the starting end and the ending end of the currently obtained periodic data respectively; carrying out EMD decomposition on the extended period data to obtain imf (k, i, p), wherein k represents the imf function order of current period EMD decomposition, i represents the data point sequence inthe imf function, and p represents the data period number of current processing; according to the implementation of a real-time acquisition process, fusing imf signals of corresponding orders of eachperiod to obtain a signal processing result imf (kk, ii), wherein kk represents an imf function order of EMD decomposition in the current period, and ii represents a data point sequence in an imf function. According to the method, quasi-real-time processing can be realized for the field signals, the calculation efficiency is improved while the endpoint effect is suppressed through continuation ofthe upper envelope line and the lower envelope line in the processing process, and the application range of the EMD method can be effectively expanded.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to an EMD method and device which can be used for real-time signal processing. Background technique [0002] EMD (Empirical Mode Decomposition, Empirical Mode Decomposition) is a new adaptive signal time-frequency processing method creatively proposed by N.E.Huang in NASA and others in 1998. This method is based on the time scale characteristics of the data itself to decompose the signal without pre-setting any basis function, and can be applied to the decomposition of any type of signal in theory, so it has a very obvious effect on dealing with non-stationary and nonlinear data The advantage is that it has a high signal-to-noise ratio. [0003] At present, the EMD method is used in technical fields such as filtering and target tracking, and in engineering fields such as analysis of ocean, atmosphere, and celestial observation data and seismic records, mechanical fault diagnosis, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06K9/00G06K9/62
CPCG06Q10/04G06F2218/04G06F18/25
Inventor 宋雷郑振兴陈飞昕
Owner GUANGDONG POLYTECHNIC NORMAL UNIV
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