时域宽带自适应波束形成器设计  

Design of Adaptive Broadband Beamformer in Time Domain

作　　者：吴凯[1] 苏涛[1] 逄锦昊 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《雷达科学与技术》2015年第3期296-301,共6页Radar Science and Technology

基　　金：国家自然科学基金(No.61271291);新世纪优秀人才支持计划(No.NCET-09-0630)

摘　　要：针对现有含反馈支路的时域宽带自适应波束形成器运算量大、干扰抑制能力受限的问题,基于广义旁瓣相消结构,引入一条固定系数的全极点反馈支路,设计一种新的时域宽带自适应波束形成器,减少了前向支路所需抽头延迟线个数即自适应权个数,从而降低了运算量,加快了收敛速度。全极点反馈支路以逼近包含干扰频带的带通滤波器为目标进行离线最优化设计,在保证稳定性的同时,增强了波束形成器的干扰抑制能力。仿真结果表明:与现存含反馈支路的时域宽带自适应波束形成器相比,采用相同的自适应算法,设计的波束形成器收敛更快、干扰抑制能力更强;实现相同的SINR改善时,新的波束形成器所需运算量远小于现存波束形成器。The existing adaptive broadband beamformers with feedback branches have large computa- tional load and are limited in the interference suppression ability. By introducing a feedback branch with fixed feedback weights, a new adaptive broadband beamformer based on the generalized sideiobe canceller（GSC） is deigned. Therefore, the adaptive weights needed in the forward branch become less, which reduces the com- putational load and speeds up the convergence. Since the feedback weights are obtained off-line through ap- proximating the band-pass filter whose passband covers that of the interference, the stability of the beam- former is ensured along with enhanced interference suppression ability. Simulation results show that the new beamformer shows a faster convergence rate and stronger interference ability compared with other existing beamformers employing the same adaptive algorithms. For achieving the same SINR improvement, the new beamformer＇s computation load is much less than the others.

关 键 词：宽带自适应波束形成 广义旁瓣相消 干扰抑制 运算量 固定反馈权 

分 类 号：TN958.92[电子电信—信号与信息处理]