基于分数时延的宽带自适应波束形成

对于宽带信号,基于移相的窄带波束形成方法会导致方向图波束指向的偏移和主波束畸变,并且无法有效地抑制宽带干扰。该文提出了基于数字时延加抽头延迟线(tapped delay line,TDL)结构的宽带自适应波束形成方法。该方法采用数字时延滤波单元补偿宽带信号在波束指向上的相位和包络偏移,并用基于TDL的空时二维滤波处理抑制宽带干扰。分析和实验结果表明,该方法可以有效地合成空间宽带波束并抑制宽带干扰,提高信干噪比(signal-to-in-terference-plus-noise ratio,SINR)增益。

Broadband adaptive digital beamforming based on fractional delay

In broadband digital beamforming,the phase-shift method results in beam pattern deviation and main lobe distortion and cannot effectively suppress broadband interference.A system using digital time-delay filters and a tapped delay line(TDL) was built to implement broadband beamforming with interference suppression.This method uses digital true time delay filters to compensate for the phase deviation at the pointing bearing and uses space-time filtering based on TDL to suppress broadband interference.Analyses and simulations show that this method is effective for both broadband beamforming and broadband interference suppression,which improves the signal-to-interference-plus-noise ratio(SINR) gain of received signal processing by broadband digital beamforming.