基于Hermite插值滤波器的直接延时补偿超宽带波束形成技术研究

摘要

Beamforming of Ultra Wide Band (UWB) signals is a crucial technology in UWB radar. Conventional beamforming methods have limitations in instantaneous bandwidth, scanning range, beam pattern deviation and a mainlobe distortion. Direct Time Delay (DTD) compensation is an effective way to avoid above problems. In this paper, a DTD compensation based on Hermite interpolation filters is presented to implement beamforming of UWB signals. Theoretical analysis and simulation results show that the magnitude responses and group delay of the proposed filters are better than those based on Lagrange and Radial basis methods. The demonstration of the UWB Linear-Frequency modulated (LFM) signal also shows excellent performances on the UWB beamforming of the proposed method.%超宽带(UWB)信号波束形成是 UWB 雷达的关键性技术。传统的波束形成方法存在瞬时带宽和扫描角度受限，波束偏移等问题，直接延时补偿法是避免上述问题的有效途径。该文提出了基于 Hermite 插值滤波器的直接延时补偿波束形成方法，理论分析和仿真结果均表明 Hermite 插值滤波器幅频特性和群时延特性优于目前常用的Lagrange和径向基插值滤波器。超宽带线性调频信号实例仿真也表明了该方法在超宽带波束形成性能方面的优越性。