CN-121978762-A - Scalar magnetic anomaly ground movement measurement system and magnetic map measurement method

Abstract

The application belongs to the technical field of magnetic measurement, in particular to a scalar magnetic anomaly ground movement measurement system and a standard magnetic diagram measurement method, which comprise the following steps of vertically arranging two scalar sensors at different heights; the method comprises the steps of obtaining magnetic anomaly data after leveling of two scalar sensors and three-dimensional position data of corresponding measuring points, calculating the upward extended calculation surface elevation of data after leveling of a lower Fang Biaoliang sensor according to the elevation of the two scalar magnetic sensor measurement data, extending the measurement data of a lower scalar sensor to a calculation surface according to the upward extended calculation surface elevation to obtain extended magnetic anomaly data, calculating the pearson correlation coefficient of the extended magnetic anomaly data and the upper scalar magnetic sensor anomaly data, obtaining a correlation threshold value, judging whether the pearson correlation coefficient is larger than or equal to the correlation threshold value, if so, the extended magnetic anomaly data is a measured magnetic map, and vibration errors caused by ground fluctuation can be effectively reduced through extension calculation.

Inventors

• ZHAO JING
• WANG YONG
• CHAI JIN
• CAO WENLIANG
• YUE LIANGGUANG
• WANG YI
• LIN DINGYUE
• WANG HAN

Assignees

• 吉林大学

Dates

Publication Date

20260505

Application Date

20251222

Claims (6)

1. 1. A method of magnetic mapping, the method comprising: Placing two scalar sensors vertically at different heights; Obtaining magnetic anomaly data after leveling of two scalar sensors and three-dimensional position data of corresponding measuring points; calculating the elevation of a calculation surface extended upwards by data after leveling of the lower Fang Biaoliang sensor according to the elevation of the measured data of the two scalar magnetic sensors; extending the measurement data of the lower scalar sensor upwards to a calculation surface according to the upward extension calculation surface elevation to obtain extension magnetic anomaly data; Calculating pearson correlation coefficients of the extended magnetic anomaly data and the upper scalar magnetic sensor anomaly data; Obtaining a correlation threshold value, and judging whether the pearson correlation coefficient of the extended magnetic anomaly data and the magnetic anomaly data of the upper scalar magnetic sensor is larger than or equal to the correlation threshold value; And if the pearson correlation coefficient of the extended magnetic anomaly data and the magnetic anomaly data of the upper scalar magnetic sensor is larger than or equal to the correlation threshold value, the extended magnetic anomaly data is the measured magnetic map.
2. 2. The method of claim 1, wherein calculating the calculated surface elevation of the upward continuation of the post-leveling data of the lower Fang Biaoliang sensor based on the elevations of the two scalar magnetic sensor measurements comprises: , As the total number of magnetically anomalous data, Z-axis position information of magnetic anomaly data after leveling for the upper scalar magnetic sensor, Z-axis position information of magnetic anomaly data after leveling for a lower scalar magnetic sensor, To calculate the elevation of the surface.
3. 3. The method of claim 1, wherein extending the lower scalar sensor measurement data up to the calculation surface based on the upward extension calculation surface elevation to obtain extended magnetic anomaly data, comprising: Performing Fourier transform on the data leveled by the scalar sensor below to obtain corresponding spectrum data; Multiplying the spectrum data by an upward continuation factor to obtain spectrum data which extends upward to a calculation surface; And performing inverse Fourier transform on the frequency spectrum data of the calculation surface to obtain the extended magnetic anomaly data.
4. 4. The method of claim 1, wherein if the pearson correlation coefficient between the extended magnetic anomaly data and the upper scalar magnetic sensor magnetic anomaly data is less than the correlation threshold, re-performing the upward extension calculation is performed.
5. 5. A scalar magnetic anomaly ground movement measurement system for realizing the magnetic map measurement method according to any one of claims 1-4 is characterized by comprising a lower scalar magnetic sensor, an upper scalar magnetic sensor, an RTK antenna, an inertial measurement unit, a data acquisition and recording device and a connecting rod, wherein, The connecting rod is vertically connected to the instrument carrying platform, the RTK antenna is arranged at the top end of the connecting rod, the lower scalar magnetic sensor and the upper scalar magnetic sensor are arranged at different heights of the connecting rod, and the inertia measuring unit is arranged on the instrument carrying platform; The data acquisition and recording device synchronously acquires data of the inertial measurement unit, the RTK antenna, the lower scalar magnetic sensor and the upper scalar magnetic sensor.
6. 6. The scalar magnetic anomaly ground movement measurement system of claim 5, further comprising a host computer for obtaining magnetic anomaly data from the two scalar sensors after leveling and three-dimensional position data for corresponding points, and processing the data to obtain a magnetic map.

Description

Scalar magnetic anomaly ground movement measurement system and magnetic map measurement method Technical Field The application belongs to the technical field of magnetic measurement, and particularly relates to a scalar magnetic anomaly ground movement measurement system and a standard magnetic diagram measurement method. Background The magnetic anomaly detection technology is an effective technical means for detecting a magnetic target body, and is widely applied to the fields of geological resource exploration, metal pipeline detection, non-explosive detection and the like because the magnetic anomaly detection technology has the characteristics of being free from weather influence, non-contact measurement and the like. The ground magnetic anomaly measurement uses a mobile carrying platform to carry magnetic measurement equipment, has the characteristics of low cost and high precision, and is a common magnetic anomaly measurement form. However, due to the limitation of the field ground environment condition, the vibration error caused by ground fluctuation is inevitably introduced into the measuring system in the moving process, so that the magnetic measurement precision is reduced. On the other hand, when a magnetic target is present, the magnetic anomaly signal generated by the magnetic target decays in a cubic manner with the distance from the target to the measurement point, and small changes in the measurement height affect the accuracy of the magnetic pattern, even resulting in false targets. Disclosure of Invention Aiming at the defects of the conventional ground movement measurement system, in particular to the problems that the vibration error of the conventional ground movement measurement system and the standard magnetic diagram with the measurement height on the same plane cannot be provided and the actual detection requirement cannot be met, the scalar magnetic anomaly ground movement measurement system and the magnetic diagram measurement method are provided. According to one aspect of the embodiment of the application, a magnetic chart measuring method is provided, and comprises the following steps: Placing two scalar sensors vertically at different heights; Obtaining magnetic anomaly data after leveling of two scalar sensors and three-dimensional position data of corresponding measuring points; calculating the elevation of a calculation surface extended upwards by data after leveling of the lower Fang Biaoliang sensor according to the elevation of the measured data of the two scalar magnetic sensors; extending the measurement data of the lower scalar sensor upwards to a calculation surface according to the upward extension calculation surface elevation to obtain extension magnetic anomaly data; Calculating pearson correlation coefficients of the extended magnetic anomaly data and the upper scalar magnetic sensor anomaly data; Obtaining a correlation threshold value, and judging whether the pearson correlation coefficient of the extended magnetic anomaly data and the magnetic anomaly data of the upper scalar magnetic sensor is larger than or equal to the correlation threshold value; And if the pearson correlation coefficient of the extended magnetic anomaly data and the magnetic anomaly data of the upper scalar magnetic sensor is larger than or equal to the correlation threshold value, the extended magnetic anomaly data is the measured magnetic map. Further, according to the elevation of the measured data of the two scalar magnetic sensors, calculating the elevation of the calculation surface of the upward continuation of the data of the leveled sensor of the lower Fang Biaoliang comprises:, As the total number of magnetically anomalous data, Z-axis position information of magnetic anomaly data after leveling for the upper scalar magnetic sensor,Z-axis position information of magnetic anomaly data after leveling for a lower scalar magnetic sensor,To calculate the elevation of the surface. Further, according to the upward continuation computation surface elevation, the upward continuation of the measurement data of the lower scalar sensor to the computation surface to obtain the continuation magnetic anomaly data includes: Performing Fourier transform on the data leveled by the scalar sensor below to obtain corresponding spectrum data; Multiplying the spectrum data by an upward continuation factor to obtain spectrum data which extends upward to a calculation surface; And performing inverse Fourier transform on the frequency spectrum data of the calculation surface to obtain the extended magnetic anomaly data. Further, if the pearson correlation coefficient between the extended magnetic anomaly data and the upper scalar magnetic sensor magnetic anomaly data is smaller than the correlation threshold, performing upward extended calculation again. According to the second aspect of the embodiment of the application, the scalar magnetic anomaly ground movement measurement system comprises a lower