High-Precision DOA Estimation Method Based on Synthetic Aperture Technique  

作　　者：Yongjia Dou Guangcai Sun Yuqi Wang Mengdao Xing 

机构地区：[1]National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China [2]School of Communication and Information Engineering,Xi’an University of Science and Technology,Xi’an 710054,China

出　　处：《Journal of Beijing Institute of Technology》2024年第2期111-118,共8页北京理工大学学报（英文版）

基　　金：supported in part by the National Science Fund for Excel-lent Young Scholars(No.62222113);in part by the joint Funds of the National Natural Science Foundation of China(No.U22B2015);in part by the stabilization support of National Radar Signal Processing Laboratory(No.KGJ202203);in part by the Fundamental Research Funds for the Central Universities(No.ZDRC2004).

摘　　要：The existing direction-of-arrival(DOA)estimation methods only utilize the current received signals,which are susceptible to noise.In this paper,a method for DOA estimation based on a motion platform is proposed to achieve high-precision DOA estimation by utilizing past and present signals.The concept of synthetic aperture is introduced to construct a linear DOA estima-tion model.A DOA fine-tuning method based on the linear model is proposed to eliminate the lin-ear DOA variation,achieving a non-coherent accumulation of DOA estimations.Moreover,the baseband modulation and the phase modulation caused by the range history are compensated to achieve the coherent accumulation of all the DOA estimations.Simulation results show that the proposed method can significantly improve the DOA estimated accuracy at low signal-to-noise ratios(SNR).

关 键 词：synthetic aperture direction-of-arrival(DOA)estimation coherent accumulation 

分 类 号：TN911.7[电子电信—通信与信息系统]