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《Acta Electronica Sinica》 2017-03
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A Direct Localization Method for Moving Narrowband Source Based on Doppler Frequency Shifts

WANG Ding;ZHANG Gang;School of Information Systems Engineering,PLA Information Engineering University;Scientific Research Department,PLA Information Engineering University;  
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.
【Fund】: 国家自然科学基金(No.61201381)
【CateGory Index】: TN95
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