Research On Magnetic Target Detection And Positioning Technology

Magnetic anomaly detection technology detects and locates the magnetic target by collecting the magnetic anomaly field information around the magnetic target.Magnetic anomaly detection technology is widely used in the fields of earth resource exploration and underwater magnetic target detection,and plays an important role in national economic development and national defense construction.Based on the detection and localization of magnetic targets,this thesis conducts related research on magnetic target detection algorithm,magnetic anomaly localization algorithm and multi-magnetic dipole inversion method,and constructs a magnetic anomaly detection experimental device for verification research.The main work of this paper is as follows:Aiming at the detection of magnetic targets,the orthogonal basis function method based on energy function,orthogonal basis function method based on error function,adaptive filtering method and minimum entropy filter method are introduced.The detection effects of these methods are also carried out.Simulation verifies the feasibility of the algorithm.The advantages of using magnetic tensor information for positioning are analyzed.The tensor magnetic probe scheme of magnetic sensor cube configuration is constructed.Then Euler inversion method,total field gradient method,tensor modulus gradient method and TFG-TMG joint method are studied.The advantages and disadvantages of various methods are analyzed by simulation,and the optimal size of the measurement array is analyzed based on the minimum positioning error.The joint method is used to simulate the magnetic target tracking method.The magnetic field distribution characteristics of multi-magnetic dipoles are analyzed,and the simulation results of multi-magnetic dipole inversion are carried out.The simulation of different types of target models through different scales shows that magnetic targets can be regarded as single magnetic dipoles under large-scale condition and show the characteristics of the multi-magnetic dipole in the close range.The experimental device and experimental scheme were designed.The magnetic target detection and positioning experiments were carried out under the actual environment.The related algorithm research was verified.