A Wideband Array Beamforming Method of Conformal Array Based by All-pass Digital Filters

Abstract

In wideband signal beamforming, the traditional phase-shift method causes pattern pointing deviation and sidelobe widening, so the true time delay should be used to compensate the cannel delay accurately. In this paper, in view of the conformal array wideband beamforming of low computational complexity and high delay precision from a real-time processing, it proposes divide the real-time delay into integer and fractional parts. The low-order FIR filter and the high-order FIR filter are cascaded to used to form the digital beam forming device. The simulation result indicates that, the method proposed in this paper can effectively solve the pattern pointing deviation and sidelobe widening problems.