High-resolution digital beamforming of UWB signals based on Carathéodory representation for delay compensation and array extrapolation  

作　　者：DU Qiang SONG Yaoliang JI Chenhe AHMAD Zeeshan 

机构地区：[1]School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Journal of Systems Engineering and Electronics》2018年第5期918-926,共9页系统工程与电子技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(61271331; 61571229)

摘　　要：To realize high-resolution digital beamforming(DBF)of ultra-wideband(UWB) signals, we propose a DBF method based on Carath ′eodory representation for delay compensation and array extrapolation. Delay compensation by Carath ′eodory representation could achieve high interpolation accuracy while using the single channel sampling technique. Array extrapolation by Carath ′eodory representation reformulates and extends each snapshot, consequently extends the aperture of the original uniform linear array(ULA) by several times and provides a better realtime performance than the existing aperture extrapolation utilizing vector extrapolation based on the two dimensional autoregressive(2-D AR) model. The UWB linear frequency modulated(LFM) signal is used for simulation analysis. Simulation results demonstrate that the proposed method is featured by a much higher spatial resolution than traditional DBF methods and lower sidelobes than using Lagrange fractional filters.To realize high-resolution digital beamforming(DBF)of ultra-wideband(UWB) signals, we propose a DBF method based on Carath ′eodory representation for delay compensation and array extrapolation. Delay compensation by Carath ′eodory representation could achieve high interpolation accuracy while using the single channel sampling technique. Array extrapolation by Carath ′eodory representation reformulates and extends each snapshot, consequently extends the aperture of the original uniform linear array(ULA) by several times and provides a better realtime performance than the existing aperture extrapolation utilizing vector extrapolation based on the two dimensional autoregressive(2-D AR) model. The UWB linear frequency modulated(LFM) signal is used for simulation analysis. Simulation results demonstrate that the proposed method is featured by a much higher spatial resolution than traditional DBF methods and lower sidelobes than using Lagrange fractional filters.

关 键 词：BEAMFORMING ultra-wideband(UWB) array extrapolation Carathéodory representation fractional delay 

分 类 号：TN925[电子电信—通信与信息系统]