Constrained Polynomial Fitting and Leveling Method for Airborne Electromagnetic Data in Time Domain
A polynomial fitting, aviation electromagnetic technology, applied in the field of time domain aviation electromagnetic data processing, can solve problems such as distortion of leveling results, and achieve the effect of avoiding distortion, improving profile curves, and ensuring accuracy
Active Publication Date: 2017-11-24
JILIN UNIV
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[0005] The purpose of the invention in this paper is to provide an accurate time-domain airborne electromagnetic system with constraints polynomial fitting leveling method, this method is mainly aimed at the traditional fitting method ignoring the relationship between time channels, which may lead to distortion of the leveling results between channels The problem
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[0051] Below in conjunction with accompanying drawing and embodiment for further detailed description:
[0052] Take a set of data detected by Geotech in the Nestor Falls area in northwest Ontario, Canada as an example. The data was used from January 26 to March 1, 2014 Plus system detected. The 42 surveying lines from the west to the east surveying line numbered L310-L720 are taken as the reference surveying lines, each surveying line corresponds to 5748 surveying points, and each surveying point extracts 32 channels of data.
[0053] Step 1: Read in airborne electromagnetic data B((pV*ms) / (A*m 4 )), denoted as d t , read in the corresponding height of each measuring point data, and put the original data d t Remove height influence, convert to data
[0054] d=d t ×(h / R) 3 , (1)
[0055] Among them, the transmitting coil radius R is 26m.
[0056] Step 2 The contour map of the first data (survey line L310) of data d is as follows figure 2 As shown in (a) (the directio...
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The invention relates to a time-domain aviation electromagnetic data constraint polynomial fitting leveling method, and mainly aims at solving a problem of distortion, caused by the neglecting of all time channels in a conventional fitting method, among channels of a leveling result. The method comprises the steps: firstly removing the height influence of electromagnetic data; secondly selecting reference measurement lines for all time channel data, sequentially carrying out the fitting of the leveling errors of the adjacent measurement lines, and obtaining a first leveling result; secondly a reference channel, building an inequation relation among all time channels through the attenuation relation among all measurement points, taking the inequation as the constraint, carrying out the fitting of the leveling errors of the adjacent measurement lines, and obtaining a leveling result. The method provided by the invention can remove the strip-shaped errors of the measurement region data quickly and effectively, adds the inequation relation among all time channels of the measurement points in a leveling process for constraint, greatly improves a section curve of the leveling result, avoids the distortion among all channel data of the leveling result, and guarantees the accuracy of the leveling result. The method does not need a measurement line cutting line for auxiliary correction, and saves a large amount of money.
Description
technical field [0001] The invention relates to a time-domain airborne electromagnetic data processing method, in particular to a constrained polynomial fitting airborne electromagnetic data leveling method. Background technique [0002] Time-domain aeronautical electromagnetic method (ATEM) is a geophysical detection method using aircraft as a carrier. It is widely used in mineral resources, groundwater and oil and gas detection, etc., and has the advantages of high speed and high efficiency. However, during the flight detection process of the airborne electromagnetic system, due to many unavoidable interference factors, such as flight direction, flight altitude, temperature, etc., the data references of each survey line in the survey area are at different levels. Striped errors appear on the graph, and regional and local anomalies are distorted and distorted, resulting in false anomalies and deteriorating data quality. In order to remove banding errors and obtain accurate...
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IPC IPC(8): G01V3/38G01V3/16G01V3/165
CPCG01V3/16G01V3/165G01V3/38
Inventor 朱凯光张琼彭聪陆依明于紫凝
Owner JILIN UNIV