Research On Magnetic Modeling Simulation Technology Of Marine Target

The ocean area is large in our country,and the magnetic field modeling and magnetic anomaly detection technology research of marine targets play an important role in safeguarding national marine rights and reducing hostile threats.In the traditional hybrid model of magnetic dipoles and rotating vertical spheres,there are some problems,like the number of magnetic dipoles is fixed,the scope of application is small and the fitting accuracy is not high.In the process of magnetic anomaly signal detection,there are problems that the traditional method has low accuracy of compensation and the magnetic anomaly waveform is not easy to detect.Besides,the existing research is short of dedicated integrated simulation surroundings.This subject is aimed at above problems,and research on magnetic field modeling and magnetic anomaly detection technology,designed a simulation system that integrates magnetic field modeling and magnetic anomaly detection function,improves modeling accuracy,optimizes magnetic anomaly detection technology,and effectively reduced research costs.First of all,for the magnetic field modeling,the change of the number of magnetic dipoles is realized by adding new criterion of the modeling results,and introduce simulated annealing algorithm to optimize the position distribution of the magnetic dipoles,condition number can be reduced by more than 10 times,and the motion parameter model is used,and the forward modeling range of the model is extended to any course,and the forward modeling algorithm of the model is designed.As a result,a modeling method that automatically meets the accuracy requirements by adjusting the number of magnetic dipoles is realized,which provides a source of simulation data for the subsequent magnetic anomaly detection research.Secondly,for the magnetic anomaly detection technology,the magnetic anomaly signal is divided into the geomagnetic field signal,the measurement carrier platform interference signal,the target magnetic field signal and the environmental noise.IGRF(International Geomagnetic Reference Field)model is implemented for compensating the magnetic field,and the average error is about 0.93 n T;The mathematical interference model of the measurement carrier platform is implemented,and the compensation coefficient is calculated using the EIV(Error In Variable)algorithm,compared with the least square method,the error is reduced by 5 times;Then the detection method based on the decomposition of OBF(orthogonal basis function)in wavelet domain is used to remove the environmental noise.It can improve the signal-to-noise ratio by about 20 d B and effectively detect the magnetic anomaly waveform from the signal.Finally,a simulation system integrated with magnetic field modeling and magnetic anomaly detection based on numerical analysis software tools can be used in engineering applications and related research,which reduces the cost of data acquisition and improves the research efficiency of related algorithms.