Research On The Mechanism Of Ground Armored Target Detection Based On Geomagnetic Information

With the improvement of magnetic detection theory and the improvement of the accuracy of magnetic sensors,target detection technology based on geomagnetic information has received extensive attention in recent years.Geomagnetic detection has great research significance in the field of target detection and recognition due to its own advantages such as good concealment and strong anti-interference ability.This paper is mainly based on the target detection mechanism anomaly signal,the ground around the ferromagnetic target magnetic anomaly distribution around a study,and further identify the relative orientation of the target and the projectile trajectories around the target in accordance with different magnetic characteristics.First,the ground ferromagnetic target model is established and Helmholtz coil is used to simulate the geomagnetic environment.The finite element calculation is used to obtain the magnetic field disturbance distribution around the target.Then analyze the magnetic field distribution from the size of the magnetic field and the deflection of the magnetic field lines.In order to verify the correctness of the magnetic field simulation,experiments were conducted to collect and process the magnetic field data around the target model.The experimental results show that the simulation calculation results of the magnetic field around the target are consistent with the distortion characteristics of the measured magnetic field data.At the same time,it analyzed the reasons for the deviation between the measured data and the simulation data,and made supplementary experiments on the target remanence problem.The results showed that the target remanence is one of the reasons for the deviation between the measured data and the simulation data.Aiming at the magnetic field simulation data processing,a spatial data extraction method is proposed—(IDW).The principle of IDW interpolation algorithm and related parameter settings are explained in detail.Algorithm program is written.Meanwhile evaluate the calculation accuracy of the algorithm.The trajectory extraction program is written to achieve the extraction of the magnetic field data of any point around the target.Target magnetic field simulation and the magnetic field signal based on the trajectory extracting method,orientations of the respective plurality of tracks around the target magnetic field data extracted.Take the three-axis components of magnetic induction intensity,,,and total magnetic field B,deflection angle ?,? as two sets of magnetic characteristic quantities.According to the increase and decrease trend of the magnetic feature quantity,the surrounding area of the target is divided into four directions: left,upper left,right,and upper right.The trajectory characteristics of the four azimuths under the condition of multiple angles between the magnetic field and the target are discussed,and a feature database corresponding to the trajectory signal characteristics and the azimuth is initially established,so as to identify the azimuth based on the characteristics of the magnetic anomalous signal around the target.Making full use of geomagnetic information to detect and recognize targets can improve the reliability of target detection,help the ammunition to obtain target information in time,adopt appropriate detonation methods to concentrate firepower to damage the target,and continuously improve the intelligent and smart design of ammunition.Therefore,the target detection technology based on geomagnetism is very promising.