基于方向向量Fourier级数近似的近场波束形成快速算法  

Fast nearfield beamforming algorithm based on the Fourier series approximation of the steering vector

作　　者：蒋飚[1] 凌国民[1] 陈伏虎[1] 

机构地区：[1]杭州应用声学研究所,浙江杭州310012

出　　处：《系统工程与电子技术》2008年第9期1621-1623,共3页Systems Engineering and Electronics

基　　金："十一五"装备预研项目基金资助课题

摘　　要：研究了一种近场距离/方位聚焦波束形成快速算法,离线计算每个搜索距离处的阵列方向向量,利用方向向量关于方位角的周期性,将方向向量的每个分量用有限项Fourier级数近似,从而搜索距离处的角度谱可以用FFT快速实现,无需在每个距离/方位栅格上计算时延和相位补偿,有效减小了计算量和存储量。数值分析结果表明,该算法性能接近理想的近场波束形成。A fast nearfield range and bearing focused beamforming algorithm is researched. The array steering vectors are computed in each searching range points, and by the fact that the steering vector is a periodic function with respect to the bearing, thus each elements of the steering vector can be expanded approximately by the finite number of Fourier series. Consequently, the angular spectra at the searching range point can be implemented using FFT. There is no need to compute the time delays in each range and bearing grids and to perform phase compensations as well, so the computational load and storage requirements are reduced a lot. Numerical results show that the proposed method can approach the optimal performance of the nearfield beamforming.

关 键 词：近场信号 聚焦波束形成 方向向量 FOURIER级数 

分 类 号：TN911.72[电子电信—通信与信息系统]