Abstract
The structural characteristics of the magnetic gradient full tensor measurement system are important factors affecting the accuracy of the magnetic gradient full tensor measurement. In order to analyze the measurement error of the cross-shaped magnetic gradient full tensor measurement system, the theoretical framework and structural configuration of the tensor system that is based on the magnetic dipole model are introduced. Four factors including the resolution, baseline length, target distance, and magnetic moment direction that cause measurement errors are simulated and analyzed. The simulation results show that the resolution, baseline length, and target distance have a great influence on the error of the measurement system. In contrast, the influence caused by the change in the magnetic moment direction is not significant. In a certain area, the resolution increases from 1 nT to 1 fT, and the error percentage of the tensor component Byy decreases the most, reaching 2.1370%. When designing the system structure, it is necessary to comprehensively consider the measurement purpose, design cost, measurement error, and other factors. It is important to select the fluxgate according to actual needs and coordinate the relationship between the baseline length and the measurement distance, which can be effective to decrease the error. The research conclusion can provide theoretical guidance for the design of the cross-shaped magnetic gradient full tensor measurement system.
Highlights
Magnetic detection is a passive target detection method.1 Compared with the traditional method such as infrared detection, laser detection, and sound detection, the magnetic detection method has the advantages of good concealment and strong anti-interference ability
The simulation calculation has a resolution of 1 nT–1 fT, a baseline length of 0.1 m–1 m, the measurement distance of 2 m–15 m, and the direction of 15○–75○
The results show that the three factors of resolution, baseline length, and target distance have a greater impact on the calculation of the full tensor, and the error change caused by the change in the magnetic moment direction is not very large
Summary
Magnetic detection is a passive target detection method. Compared with the traditional method such as infrared detection, laser detection, and sound detection, the magnetic detection method has the advantages of good concealment and strong anti-interference ability. The magnetic gradient full tensor has many advantages including being less affected by the magnetization direction of the geomagnetic field, effectively avoiding the interference of the geomagnetic field, and obtaining the characteristic information of the magnetic target more accurately.. This paper takes a typical cross-shaped magnetic gradient full tensor measurement system as the research object, introduces the configuration structure of the system, and analyzes the factors affecting the measurement error of the system in detail. It simulates and analyzes the change trend of the error percentage of the components with the main structural parameter change. Suggestions on the design of the magnetic gradient full tensor measurement system are purposed
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