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Magnetic resonance response signal parameter extraction method and system based on cyclic correlation

A response signal and parameter extraction technology, which is applied in the fields of electron magnetic resonance/nuclear magnetic resonance detection, radio wave measurement system, electric/magnetic exploration, etc., can solve the problems of complex signal extraction, difficult analysis of signal characteristics, and many causes , to achieve the effect of improving accuracy, filtering out different frequency interference, and improving signal-to-noise ratio

Active Publication Date: 2021-06-01
JILIN UNIV
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Problems solved by technology

[0004] However, in addition to the magnetic resonance response signal, the observation data collected by the nuclear magnetic resonance water finder also contains a variety of man-made noise and environmental noise, which are caused by many and very complicated reasons.
Noise interference is everywhere and coexists with the magnetic resonance response signal we need. When the noise is relatively large, the signal may even be submerged in the noise, which brings great difficulties to signal extraction and signal feature analysis

Method used

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  • Magnetic resonance response signal parameter extraction method and system based on cyclic correlation
  • Magnetic resonance response signal parameter extraction method and system based on cyclic correlation
  • Magnetic resonance response signal parameter extraction method and system based on cyclic correlation

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Embodiment 1

[0048] like figure 1 As shown, this embodiment provides a method for extracting magnetic resonance response signal parameters based on cyclic correlation, which specifically includes:

[0049] Step 101: receiving magnetic resonance response data;

[0050] Step 102: Process the magnetic resonance response data using a circular correlation method to obtain a circular correlation function to be solved;

[0051] Step 103: Using a parameter estimation method to solve the circular correlation function to be solved to obtain the average decay time of the magnetic resonance response signal, and complete the extraction of the parameters of the magnetic resonance response signal.

[0052] In this embodiment, the Gaussian white noise and power frequency harmonic noise components in the magnetic resonance response data are suppressed by the circular correlation method, and the magnetic resonance response signal information is preserved to the greatest extent, thereby improving the measur...

Embodiment 2

[0094] This embodiment provides a system for extracting parameters of magnetic resonance response signals based on cyclic correlation, such as figure 2 As shown, the system includes:

[0095] a receiving module M1, configured to receive magnetic resonance response data;

[0096] The circular correlation function calculation module M2 is used to process the magnetic resonance response data using a circular correlation method to obtain a circular correlation function to be solved;

[0097] The parameter estimation module M3 is used to solve the circular correlation function to be solved by a parameter estimation method, obtain the average decay time of the magnetic resonance response signal, and complete the extraction of the parameters of the magnetic resonance response signal.

[0098] In order to better realize the function, the parameter estimation module M2 includes a rotation-invariant parameter estimation unit, and the rotation-invariant parameter estimation unit is use...

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Abstract

The invention relates to a magnetic resonance response signal parameter extraction method and system based on cyclic correlation, which are used for extracting parameters in magnetic resonance response signals of a nuclear magnetic resonance water detector. Gaussian white noise components and power frequency harmonic noise components in the magnetic resonance response signals are suppressed through a cyclic correlation processing method, so that the extraction precision of the magnetic resonance response signal parameters is improved. Then parameter estimation is carried out on the obtained cyclic correlation function to be solved, so that the exploration precision of underground water is improved, and technical support is provided for application of a nuclear magnetic resonance sounding technology in underground water exploration.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance, in particular to a method and system for extracting parameters of magnetic resonance response signals based on cycle correlation. Background technique [0002] Nuclear magnetic resonance sounding technology is currently the only geophysical prospecting method in the world that directly and effectively detects groundwater. The principle of nuclear magnetic resonance detection technology is that hydrogen nuclei in groundwater form nuclear magnetic moments through artificially induced electromagnetic fields. Compared with the past groundwater detection methods, the use of nuclear magnetic resonance technology to find water has the following advantages: First, compared with the indirect detection method, as long as there is water and the depth of the water layer is within the detection range, the detection method based on nuclear magnetic resonance technology The results can be de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/14G01V3/38
CPCG01V3/14G01V3/38Y02A90/30
Inventor 于晓辉苗顺程石屹然李新波孙晓东
Owner JILIN UNIV
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