Target Detection Technology Based On Full Tensor Magnetic Gradient Data

The full tensor magnetic gradient data has a larger amount of information and higher resolution,and can more accurately describe the magnetization direction of the magnetic target,thereby achieving the detection of the magnetic target.At present,target detection technology based on full tensor magnetic gradient data has been widely used in various fields.In the military field,it can be used to detect magnetic targets such as submarines,mines,and submarine pipelines.In the civil field,it can be used for the detection of ferromagnetic objects such as large vehicles,ships and wild mineral deposits.Although it started late in China,abundant research results have emerged,but there are still deficiencies in magnetic gradient data processing and multi-magnetic target positioning.This paper studies related technologies of magnetic target detection,focusing on key issues such as magnetic gradient data preprocessing,multi-magnetic target positioning,and system design.The main research contents are as follows:Preprocessing of full tensor magnetic gradient data.We proposed an optimized compensation model for magnetic gradient tensor for non-frequency interference signals in full tensor data.It is combined perspective of optimization methods and the nature of magnetic field data.For the frequency noise problem of full tensor data,combined with variational modal decomposition algorithm(VMD)and empirical modal algorithm(EMD),VMD-EMD algorithm is proposed for data filtering.To study the identification and positioning of multi-magnetic targets.For the current multi-magnetic target positioning process,which is complex in calculation and requires a large number of magnetic sensors.We proposed a multi-magnetic target positioning method based on Bilayer Variational Mode Decomposition combine a magnetic field frequency information.This method separately filters the full tensor data and separates the full tensor data of different magnetic targets.Combined with the single magnetic target positioning theory,a full tensor magnetic sensor can be used to locate multiple magnetic targets at once.And we study the parameter selection in the decomposition process.Research and design a full-tensor real-time detection and positioning system.Based on the positioning theory of full tensor and the preprocessing method of full tensor magnetic gradient data,a full tensor real-time positioning system is designed.It uses the magnetic sensor as the origin of the three-dimensional coordinates to detect the position of the magnetic target in real time.The paper validates the design of.full-tensor magnetic gradient data preprocessing method,multi-magnetic target positioning and full-tensor real-time positioning system design through numerical simulation and experimental verification.The research results are target detection based on full tensor magnetic gradient data References are provided for further applications.