基于磁梯度张量的目标定位改进方法

摘要

Since the current single-point localization method of magnetic gradient tensor can be affected seri-ously by geomagnetic field,an improved localization method of magnetic gradient tensor is proposed by the par-tial differential of the single-point localization method.Calculations of the parameters needed in the improved method are proposed based on the cube gradient tensor system.The improved method can achieve the magnetic localization by magnetic gradient,which reduces the influence of the geomagnetic field on magnetic localization. The simulation results show that the proposed method can hardly be affected by the geomagnetic field and has high accuracy of the magnetic localization,and the major factors affecting the localization error include precision of the magnetometer and baseline interval of the measurement system.%针对目前磁性目标单点磁梯度张量定位方法受地磁场影响较大的问题，通过对单点磁梯度张量定位算法的偏微分推导，提出了基于磁梯度张量的目标定位改进算法，并针对定位算法中的所需变量提出了基于正六面体磁梯度张量测量系统的变量计算方法。所提方法利用磁梯度实现目标定位，降低了地磁场对目标定位的影响。仿真结果证明，与原方法相比所提方法受地磁场测量误差的影响很小，且定位精度较高，磁力仪精度和系统基线是影响定位误差的主要因素。