CN-122018022-A - Magnetic three-component data extraction method in aviation transient electromagnetic-magnetic method combined detection system

CN122018022ACN 122018022 ACN122018022 ACN 122018022ACN-122018022-A

Abstract

A method for extracting magnetic three-component data in an aviation transient electromagnetic-magnetic method combined detection system belongs to the technical field of aviation transient electromagnetic exploration, and comprises the steps of acquiring original magnetic three-component data of a target detection area by a data acquisition module, processing the original magnetic three-component data by a preprocessing module to obtain standard magnetic three-component data, and calculating an original magnetic total field value by a magnetic field calculation filtering module according to the standard magnetic three-component data Then the magnetic field value caused by transient electromagnetic primary field is obtained through sliding filtering processing Image drawing module based on magnetic field values Drawing to obtain Graph, sample extraction Module Slave Extracting sample data from the graph The cyclic calculation module is based on Graph and sample data , for And (3) carrying out cyclic calculation on the periodic data of the graph, and finally obtaining magnetic three-component data without transient electromagnetic interference. The method has the advantages that pure geomagnetic data which is not interfered by transient electromagnetic can be accurately and effectively extracted from the original magnetic three-component data.

Inventors

Wu Muyang
SHI KE
HU XUQUAN
LONG GANG
Liao xian
XU ZHENGYU
WANG WEI
LIU LONGHUAN
FU ZHIHONG

Assignees

重庆大学
重庆璀陆探测技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260123

Claims (7)

1. The method for extracting the magnetic three-component data in the aviation transient electromagnetic-magnetic method combined detection system is characterized by comprising the following steps of: step 1, constructing a magnetic three-component data extraction system, wherein the magnetic three-component data extraction system is provided with a data acquisition module, a preprocessing module, a magnetic field calculation filtering module, an image drawing module, a sample extraction module and a circulation calculation module which are connected in sequence; step 2, the data acquisition module acquires original magnetic three-component data of the target detection area, and the original magnetic three-component data is processed by the preprocessing module to obtain standard magnetic three-component data ; Step 3, the magnetic field calculation filtering module calculates the data of the three components according to the standard magnetism Calculating to obtain the original magnetic total field value Then the original magnetic total field value is processed through a sliding window Performing sliding filtering treatment to obtain magnetic field value caused by transient electromagnetic primary field ; Step 4, the image drawing module draws the image according to the magnetic field value Drawing to obtain Graph and then from the Obtaining transient electromagnetic primary field excitation period length in graph And the length of the forward excitation delay And according to And Calculating to obtain the length of the negative excitation delay ; Step5, the sample extraction module extracts the sample from the sample Randomly selecting a positive excitation jump point in the graph as a sample starting point, and taking the excitation period length as a sample starting point Sample extraction is carried out as a sample length, and sample data is obtained by extraction ; Step 6, the circulation calculation module is used for calculating the circulation according to the circulation Graph and sample data For the said And (3) carrying out cyclic calculation on the periodic data of the graph, and finally obtaining magnetic three-component data without transient electromagnetic interference.
2. The method for extracting magnetic three-component data in an aviation transient electromagnetic-magnetic method combined detection system according to claim 1, wherein in the step 2, the data acquisition module is an unmanned aerial vehicle, and a magnetic probe is mounted on the unmanned aerial vehicle and is used for acquiring and storing original magnetic three-component data of a target detection area.
3. The method for extracting magnetic three-component data in an aviation transient electromagnetic-magnetic method combined detection system according to claim 1, wherein in said step 2, said preprocessing module eliminates null values and extreme outliers of said original magnetic three-component data to obtain standard magnetic three-component data 。
4. The method for extracting magnetic three-component data in an aviation transient electromagnetic-magnetic method combined detection system according to claim 1, wherein in said step 3, said magnetic field calculation filtering module calculates an original magnetic total field value The expression of (2) is: ; Wherein, the As the value of the original magnetic total field, For the x-direction magnetic component data, For the y-direction magnetic component data, Is z-direction magnetic component data.
5. The method for extracting magnetic three-component data in an aviation transient electromagnetic-magnetic method combined detection system according to claim 1, wherein in said step 4, said method comprises the steps of The graph at least comprises two complete transient electromagnetic primary field excitation periods; The image drawing module is used for drawing the image according to the following condition And Calculating the length of delay of negative excitation The expression of (2) is: 。
6. The method for extracting magnetic three-component data in an aviation transient electromagnetic-magnetic method combined detection system according to claim 1, wherein in the step 6, the cyclic calculation module obtains the magnetic three-component data without transient electromagnetic interference through cyclic calculation, and the specific process is as follows: Step 6.1. The loop calculation module is configured to calculate the loop from the loop The first in the graph Starting at a single point with an excitation period length Extracting to obtain data segment And calculate the data segment And the sample data And record the correlation value in a correlation value series In (a) and (b); Step 6.2, the loop calculation module sets a similarity value S according to the set similarity value S, and the correlation value is arranged in a plurality of rows In (2), searching for the position of the data point greater than the similarity S and recording the position in a series In (a) and (b); Step 6.3, the cyclic calculation module calculates the number sequence First derivative series of (2) Then in the first derivative sequence Searching for the position of the data point greater than 1, and recording the position number +1 in a series In (a) and (b); Step 6.4 the cyclic calculation module is arranged in a plurality of columns For position number, in the array The corresponding data value is selected, and the data value and the length of the forward excitation delay are combined Length of delay of negative excitation Respectively add and record in a plurality of columns And In the process, the The transient electromagnetic forward excitation delay value point is adopted, A value point is taken after transient electromagnetic negative excitation delay; Step 6.5, the loop calculation module is used for calculating the slave sequence And Is the first of (2) Starting at a single point, respectively at the standard magnetic three components Extracting data values corresponding to transient electromagnetic positive excitation delay value points and transient electromagnetic negative excitation delay value points, and recording the average value of the two values in a series In the array of The data in (3) is magnetic three-component data without transient electromagnetic interference.
7. The method for extracting magnetic three-component data in an aircraft transient electromagnetic-magnetic method joint detection system of claim 6, wherein in said step 6.1, said cyclic calculation module calculates a data segment And the sample data The expression of the correlation value of (2) is: ; Wherein, the The covariance is represented by the sign of the covariance, Representing the variance.

Description

Magnetic three-component data extraction method in aviation transient electromagnetic-magnetic method combined detection system Technical Field The invention relates to the technical field of aviation transient electromagnetic exploration, in particular to a magnetic three-component data extraction method in an aviation transient electromagnetic-magnetic method combined detection system. Background The aviation transient electromagnetic-magnetic method combined detection system can acquire transient electromagnetic data and magnetic data simultaneously in one flight task, so that the working efficiency is greatly improved, and the multiple interpretation can be reduced and the exploration accuracy is improved through the combined interpretation of the two methods. In the data acquisition process of the system, the three-component fluxgate probe is in a continuous sampling state. The collected data not only contains geomagnetic field and magnetic anomaly information, but also contains transient electromagnetic primary field and secondary field information, so that a part which is not interfered by transient electromagnetic interference needs to be extracted from the original magnetic three-component data for subsequent processing and explanation. The prior art has the defect that the existing magnetic three-component data extraction method cannot accurately and effectively extract pure geomagnetic data which is not interfered by transient electromagnetic interference from original magnetic three-component data. Disclosure of Invention The method for extracting the magnetic three-component data in the aviation transient electromagnetic-magnetic method combined detection system can accurately and effectively extract the pure geomagnetic data which is not interfered by transient electromagnetic from the original magnetic three-component data. In order to achieve the above purpose, the invention provides a magnetic three-component data extraction method in an aviation transient electromagnetic-magnetic method combined detection system, which is characterized by comprising the following steps: step 1, constructing a magnetic three-component data extraction system, wherein the magnetic three-component data extraction system is provided with a data acquisition module, a preprocessing module, a magnetic field calculation filtering module, an image drawing module, a sample extraction module and a circulation calculation module which are connected in sequence; step 2, the data acquisition module acquires original magnetic three-component data of the target detection area, and the original magnetic three-component data is processed by the preprocessing module to obtain standard magnetic three-component data ; Step 3, the magnetic field calculation filtering module calculates the data of the three components according to the standard magnetismCalculating to obtain the original magnetic total field valueThen the original magnetic total field value is processed through a sliding windowPerforming sliding filtering treatment to obtain magnetic field value caused by transient electromagnetic primary field; Step 4, the image drawing module draws the image according to the magnetic field valueDrawing to obtainGraph and then from theObtaining transient electromagnetic primary field excitation period length in graphAnd the length of the forward excitation delayAnd according toAndCalculating to obtain the length of the negative excitation delay; Step5, the sample extraction module extracts the sample from the sampleRandomly selecting a positive excitation jump point in the graph as a sample starting point, and taking the excitation period length as a sample starting pointSample extraction is carried out as a sample length, and sample data is obtained by extraction; Step 6, the circulation calculation module is used for calculating the circulation according to the circulationGraph and sample dataFor the saidAnd (3) carrying out cyclic calculation on the periodic data of the graph, and finally obtaining magnetic three-component data without transient electromagnetic interference. Through the design, the invention combines the extracted sample data after a series of treatments such as preprocessing, calculation filtering, image drawing and the like are sequentially carried out on the original magnetic three-component dataAnd circularly calculating periodic data of the graph to obtain magnetic three-component data without transient electromagnetic interference, namely pure geomagnetic data. The method is simple in operation, and can extract pure geomagnetic data which is free from transient electromagnetic interference from original magnetic three-component data rapidly, accurately and effectively. The extracted magnetic three-component data without transient electromagnetic interference, namely pure geomagnetic data, can be used for detecting and analyzing the ore body of a target detection area, so that mineral resource identificat