磁偶极子模型下目标定位和参数估计的两种新方法

Two New Magnetic Localization and Parameter Estimation Methods Under the Dipole Model

本文分析了磁偶极子模型下目标磁场信号的时频域特征 ,并指出了磁定位和参数估计问题的难点和特殊性 .提出了用二次差分矩阵法 (SDMM)和频谱匹配法 (FDMM)进行目标定位和参数估计 .SDMM和FDMM都是利用信号的时域或频域特征先求解出系统中的重要参数 ,将高维的最优化问题转化为顺序求解的低维求解和参数估计问题 .SDMM运算量较小、实时性好 .FDMM可靠性较好 ,适于事后分析 .对两种方法都进行了仿真计算 ,仿真结果符合理论分析 ,算法实现了目的 .本文也分析了两种算法需要进一步解决的问题 .

In the paper,analyses the time and frequency domain characteristics of the target signal under the classical magnetic dipole model and points out the difficulty and particularity of the magnetic localization and parameter estimation problem.Designs the second order difference matrix method (SDMM) and frequency domain matching method (FDMM) to solve the localization and parameter estimation problem.Both of the algorithms make use of the time and frequency domain characteristic of the signal and convert a high order optimization problem into sequential solutions of several low order problems.SDMM has low computation burden,excellent real time performance.FDMM is more reliable in low SNR environment and suitable for post analysis.Simulation of both methods meets well with the theoretical analysis and the algorithms achieve the goal.The paper also points out the further work for the two algorithms.