基于分数时延的宽带数字阵列波束形成

对于宽带数字阵列雷达，传统的波束形成方法会导致天线波束扫描不准和主瓣展宽，为此需要使用时延补偿单元取代传统窄带相控阵中的移相单元。为实现宽带数字阵列各阵元传输时延的精确补偿，引入分数时延滤波器。通过对一种分数时延滤波器设计方法及宽带数字阵波束形成原理的分析，提出针对有载波宽带雷达信号的接收波束形成实现结构。仿真结果表明了该方法的有效性，与传统波束形成方法相比，其性能与理想延时更接近。

Wideband Digital Array Beamforl7ning Based on Fractional Delay

Compared with conventional narrowband phased array radar, true time delay is used in wideband digital array to replace the phase shifter. In order to compensate the channel dispersed delay accurately, fractional delay filter（FDF） is introduced. A receiver structure based on wideband radar signal with carrier is proposed through analyzing a FDF design method and the principle of widehand digital beamforming. The effectiveness of this method is verified by the simmlation results. Compared with the conventional way, the performance of this method is similar with that of ideal time delay.