电子学报2017，Vol.45Issue(3)：591-598,8.DOI:10.3969/j.issn.0372-2112.2017.03.013
一种基于窄带信号多普勒频率测量的运动目标直接定位方法
A Direct Localization Method for Moving Narrowband Source Based on Doppler Frequency Shifts
摘要
Abstract
Compared to the conventional two-step localization method,the direct position determination (DPD) method has higher location accuracy.However,the DPD method is usually proposed for static target and is computationally expensive.This paper presents a novel DPD method for moving target at constant velocity based on the Doppler frequency shifts.First,the optimization model for directly determining the initial position and velocity of the emitter is constructed on the basis of maximum likelihood estimator (MLE),and the cost function is formulated as the maximal eigenvalue of the Hermitian matrix.In order to avoid multidimensional grid search,a Newton-type iterative algorithm based on matrix eigenperturbation theory is proposed,which involves lower computational complexity than the multidimensional grid search.In addition,the compact Cramér-Rao bound (CRB) expressions for initial position,moving velocity and track estimates are derived,which can provide a theoretical prediction for target position determination.Simulation results corroborate that the estimate variance of the proposed method is able to attain the CRB with lower computational complexity.关键词
直接位置确定/多普勒频率/最大似然估计/匀速运动目标/特征扰动/克拉美罗界Key words
direct position determination (DPD)/Doppler frequency shift/maximum likelihood estimator (MLE)/moving target at constant velocity/eigen-perturbation/Cramér-Rao bound (CRB)分类
信息技术与安全科学引用本文复制引用
王鼎,张刚..一种基于窄带信号多普勒频率测量的运动目标直接定位方法[J].电子学报,2017,45(3):591-598,8.基金项目
国家自然科学基金(No.61201381) （No.61201381）
