【摘要】 将一条具有固定系数的反馈支路引入广义旁瓣相消器(Generalized sidelobe canceller,GSC),设计了一种新的自适应宽带波束形成器。通过逼近包含干扰频带的带通滤波器,离线设计最优反馈权。研究了波束形成器的干扰抑制能力与反馈支路极点个数之间的关系。与现有含反馈波束形成器的仿真对比结果表明:由于本文波束形成器的前向支路与传统GSC相同,降低了自适应权更新的复杂性和运算量;无需极点的自适应更新,具有固有稳定性;极点个数灵活可变,增强了干扰抑制能力。更多还原

【Abstract】 By introducing a feedback branch with fixed weights,a new adaptive broadband beamformer based on the Generalized Sidelobe Canceller(GSC)is designed.The feedback weights are obtained off-line through approximating the band-pass filter whose passband covers that of the interference.Also,the relationship between the interference suppression capability of the beamformer and the number of poles of the feedback branch is investigated.Compared with existing beamformer,since the feedforward branch of the new beamformer is exactly the same as the GSC,the complexity and amount of calculations of the updating procedure for feedforward weights are reduced.Meanwhile,the fixed feedback weights guarantee its stability.Besides,the flexibility of changing the number of poles strengths its interference suppression capability.更多还原