Nuclear pulse signal denoising method based on sparse decomposition

A technology of nuclear pulse signal and sparse decomposition, which is applied in the field of nuclear pulse signal denoising of nuclear measurement system based on sparse decomposition, can solve problems such as lack of solutions, and achieve the effects of convenient implementation, improved speed, and improved signal-to-noise ratio.

Inactive Publication Date: 2019-12-20
NANHUA UNIV
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Problems solved by technology

[0005] To sum up, the existing algorithms still lack an effective solution to the problem

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  • Nuclear pulse signal denoising method based on sparse decomposition
  • Nuclear pulse signal denoising method based on sparse decomposition
  • Nuclear pulse signal denoising method based on sparse decomposition

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[0030] like Figure 1~2 As shown, an embodiment of the present invention includes:

[0031] (1) The to-be-processed nuclear pulse signal is processed in blocks. Since the size of the over-complete atom dictionary used in the process of sparse decomposition depends on the length of the signal to be processed, the larger the length of the signal to be processed, the larger the number of atoms contained in the dictionary, the larger the calculation amount of the decomposition algorithm in the atom matching process, and the faster the operation speed. will also drop. In order to solve this problem, the idea of ​​block in image processing is used for reference, and the collected signal data is decomposed into blocks. A frame of block data is only a part of the complete data sequence.

[0032] (2) Construct the corresponding time-frequency atomic dictionary based on nuclear signal features. According to the length of the Block data block in the block processing and the constructi...

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Abstract

The invention discloses a nuclear pulse signal denoising method based on sparse decomposition. The nuclear pulse signal denoising method comprises the following steps: 1, carrying out the partitioningof a to-be-processed nuclear pulse signal, dividing the to-be-processed nuclear pulse signal into M segments with the length of N, and obtaining M data blocks; 2, generating an over-complete atom dictionary D with a corresponding size according to the length N of the data block obtained by block processing and a nuclear pulse signal over-complete atom dictionary construction method; 3, setting anOMP algorithm iteration termination condition; 4, for each frame of data block, selecting an atom most matched with the kernel signal from the over-complete atom dictionary D, independently carryingout OMP decomposition on the data block, ending the decomposition when an iteration termination condition is met, and representing the signal by using a linear combination of the selected most matchedatom to obtain a frame of denoised signal; and 5, recombining the M frames of denoised signals obtained in the step 4 to obtain denoised nuclear pulse signals. The nuclear pulse signal denoising method is accurate, efficient, simple in step, reasonable in design and convenient to implement.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a nuclear pulse signal denoising method of a nuclear measurement system based on sparse decomposition. Background technique [0002] The nuclear measurement system of the nuclear power plant is used to measure the neutron flux level of the reactor, and provide reactor power information for the operator, protection system and power regulation system, which plays an extremely important role in ensuring the safe and stable operation of the reactor. As a weak signal processing system, the nuclear measurement system is susceptible to different types of interference noise, resulting in abnormal system signals. [0003] With the rapid development of science and technology, the collection, acquisition, processing and analysis methods of nuclear signals are constantly innovating and developing, especially the application of digital technology has greatly improved the collection and proces...

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Application Information

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IPC IPC(8): G06K9/00G06K9/62
CPCG06F2218/04G06F2218/08G06F18/2136
Inventor 赵修良贺三军孙娜赵健为刘丽艳周超
Owner NANHUA UNIV
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