【摘要】 提出了用地磁总场对磁性目标定位的方法.以远场磁偶极子原理构建了地磁总场的测量阵列,设计了阵列对目标的定位算法,求解中采用二重梯度算法消除了地磁总场随时间变化和空间分布不均匀对目标定位的影响.实验验证了这种二重梯度算法的有效性.利用MATHCAD对定位算法中的非线性方程组进行了仿真,采用LINGO软件求解了阵列方程组.在松花江沿岸某地,用光泵磁传感器阵列对航行中的目标船进行了定位实验,所测磁场数据曲线与理论曲线完全吻合,证明了定位算法物理模型的正确性.提出了改进的磁场梯度偏置定位算法,进一步提高了目标定位精度.实验证明了这种地磁总场目标定位方法的可行性.更多还原

【Abstract】 We propose a method of locating a magnetic target based on geomagnetic total field.According to the principle of a magnetic dipole in the far field,a measuring array of geomagnetic total field and the algorithm of locating target are designed.However,the geomagnetic total field with time-varying and uneven spatial distribution may have some influence on locating target.To eliminate the influence,a conjugate gradient algorithm is introduced.In this method,MATHCAD is used to simulate the nonlinear equations,and LINGO is used to solve the equations.In the experiment,we measured the magnetic anomaly generated by a navigating ship using optically pumped magnetometers on the coast Songhua River.The measured data are closed to the theoretical value.It means that the physical models of the algorithm are valid.To improve the accuracy of location,a modified algorithm based on magnetic gradient bias is proposed.The results show that the methods of locating target are feasible.更多还原