Study On The Joint Simulation Technology Of Magnetic Target Detection

With the maintenance of China's maritime rights and interests and the continuous development of military needs,the ability to enhance the potential to explore an urgent need.Magnetic prospecting is an important submarine detection method,and submarines in the background of the magnetic field will produce magnetic anomalies.According to the magnetic characteristics of the submarine,the magnetic anomaly signal detection model is established,and the information of the submarine location,type,motion state and other information can be obtained by inversion processing.Aiming at the problem of large exploration cost and imperfect data space,this paper has carried out the research of magnetic target detection and co-simulation technology,simulated the submarine and aircraft magnetic field by finite element method,studied the interference compensation and signal detection technology.The co-simulation system is used to manage and optimize the whole simulation,which provides a supportive environment for the research of the exploration technology.Firstly,based on the equivalent magnetic dipole model,the correspondence between magnetic field information and submarine parameters is established.Aiming at the problem that the equivalent magnetic dipole model can not effectively simulate the near-field magnetic field of the aircraft,a finite element numerical simulation method based on Maxwell's equation and electromagnetic field boundary conditions is introduced.The method can accurately calculate the magnetic field of the submarine.Secondly,the submarine and aircraft model are modeled and simulated by finite element software COMSOL.The magnetic field and the magnetic field distribution of the submarine magnetic field and aircraft interference are obtained.The magnetic characteristics of the submarine magnetism signal and the sensor mounting point are further recognized.Aiming at the requirement of aircraft jamming magnetic field compensation,the data modeling and simulation of the jamming magnetic field of the four directions aircraft are carried out.Aiming at the problems of high computational complexity and high precision in the simulation of multi-objective model in the largescale flight simulation,a method of model separation and data superposition is proposed to generate the measurement signal superimposed on the aircraft interfering magnetic field and submarine magnetic field anomaly.Magnetic field simulation data provides an effective data source for magnetic anomaly signal processing research.Thirdly,two important problems of magnetic anomaly signal processing are studied: the method of magnetic interference compensation and weak magnetic anomaly signal detection.The Tolles-Lawson model was used to estimate the aircraft jamming parameters,and the interference magnetic field after compensation was significantly reduced by the finite element simulation.After interferometric compensation of the flight simulation data,the signal detection is carried out by using the orthogonal basis function method.As a result,the 5-timesboat detection is realized effectively.Finally,a joint simulation system is designed and developed based on C language.The system integrates the functions of aircraft /submarine field modeling and simulation,weak magnetic anomaly signal detection,data management and so on.Based on this system,the magnetic field simulation,data extraction,signal detection,the results show that the whole process of the magnetic field simulation study to verify the effectiveness of the target magnetic field characteristics and signal detection methods and joint simulation technology feasibility.