Broadband Digital Beamforming Based on Fractional Delay in SAR Systems

摘要：

Synthetic Aperture Radar (SAR) system can achieve both high azimuth resolution and wide swath by applying digital beamforming (DBF) technique in its receiving terminal. This DBF-SAR system requires broadband digital beamforming on the receiving array.In broadband beamforming,phase-shift method causes beam pointing deviation and mainlobe widening.In this paper,digital true time delay filters were used to compensate the phase deviation at the pointing bearing.Under interference,a stricture composes of digital time-delay filters and tapped delay line (TDL) was built to implement adaptive broadband beamforming.It is showed by simulation that this method is effective in both broadband beamforming and broadband interference suppression,which improves the SINR of received signals.

关键词： SAR broadband digital beamforming fractional delay filter interference suppression

作者: WEI Wen LI Ning TANG Jun PENG Yingning

作者单位: Department of Electronic Engineering,Tsinghua Univesrity,Beijing 100084,China

会议类型: 国际会议

会议名称: 2009 2nd Asian-Pacific Conference on Synthetic Aperture Radar(第二届亚太合成孔径雷达会议)

会议地点: 西安

会议语种:英文

页码: 575-578

在线出版日期: 2009-10-26（万方平台首次上网日期，不代表论文的发表时间）