Method for processing ultralow frequency data

A processing method and ultra-low frequency technology, which can be used in electrical/magnetic exploration, geophysical measurement, sound wave re-radiation, etc. High, iterative process fast effect

Active Publication Date: 2011-01-26
PEKING UNIV
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  • Application Information

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Problems solved by technology

[0004] Aiming at the problem of low processing efficiency of ultra-low frequency data in the prior art, the present invention

Method used

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  • Method for processing ultralow frequency data
  • Method for processing ultralow frequency data
  • Method for processing ultralow frequency data

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0029] Take the ultra-low frequency data folder with a depth of 100-1000 meters and a step length of 5 meters as an example. This folder contains 10 acquisition data. They are 1.raw, 2.raw, 3, raw...10.raw.

[0030] Such as figure 1 As shown, the header format of the data header is as follows:

[0031] Struct header{

[0032] Char MagicNUM[4];

[0033] Char name[10];

[0034] Int btime;

[0035] Int etime;

[0036] Int lfrom;

[0037] Int lto;

[0038] Int gap;

[0039]}

[0040] Read the MagicNUM field to check the validity of the file (0x55AA). Check the checksum of the file to ensure that the data is not damaged. Calculate the number of data blocks in the file according to lfrom (starting depth), lto (cutoff depth), and gap (step size), and there are 180 data blocks in total. Calculate the address offset of each data block according to the number of da...

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Abstract

The invention discloses a method for processing ultralow frequency data, belonging to the technical field of the acquisition and processing of ultralow frequency electromagnetic signals. The method comprises the following steps: a digital signal processor (DSP) is used to perform parallel reading to ultralow frequency detection data; the data which is carried out multiple repeated detections, at the same measuring point and under the same parameters are superimposed and is performed wavelet denoising; and after the wavelet denoising processing, envelope filter processing is performed to the data to obtain result data. The method of the invention uses the DSP to realize the ultralow frequency data processing algorithm which contains filter processing and denoising processing, has the advantages of high algorithm parallelism degree and fast iterative process, and can realize more efficient ultralow frequency data processing and obtain the processing result with high signal-to-noise ratio.

Description

technical field [0001] The invention relates to ultra-low frequency electromagnetic wave signal collection and processing technology, in particular to a method for processing ultra-low frequency data. Background technique [0002] Ultra-low frequency electromagnetic detection technology has been widely used in seismic monitoring, oil and gas and coalbed methane resource exploration, goaf or groundwater detection and other fields. The detection technology includes: passively accepting ultra-low frequency electromagnetic wave signals from underground reflected natural field sources, and realizing the detection of underground substances by processing, analyzing and interpreting the signals. The effect of passive detection applications greatly depends on the design and performance of ULF data processing software and hardware. [0003] At present, the ultra-low frequency data processing software can basically only complete data acquisition, processing, forward and inversion, res...

Claims

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Application Information

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IPC IPC(8): G01V3/38
Inventor 秦其明王清培崔容菠张泽勋
Owner PEKING UNIV
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