摘要
在窄带数字阵列波束形成中,通过补偿各阵元之间的时延带来的相移而合成波束。对于宽带数字阵列,相同的时延不同的频率会带来相移的不同,窄带波束形成方法会导致宽带波束方向图畸变,必须采用宽带数字波束形成技术。通过分析信号带宽对窄带数字波束形成的影响,以及宽带数字波束形成的原理,给出了基于分数时延的宽带数字波束形成方法和仿真的结果,在数字域上实现了宽带波束形成。
Conventional depends on compensating phase-shift resulting from time delay between array elements, for wide- band digital array, the same time delay and different frequency bring different phase shift. The narrowband digital array beam- forming method results in beam pattern deviation and main lobe distortion in broadband beamforming. Through the analysis of im- pacts of signal bandwidth on narrowband digital beamforming and the principles of wideband digital beamforming, the paper in- troduces the broadband beamforming method based on fractional delay. The analysis and simulation results show that the method is effective for broadband beamforming.
出处
《现代电子技术》
2013年第5期24-26,共3页
Modern Electronics Technique
关键词
宽带
数字阵列
数字波束形成
分数时延
wideband
digital array
digital beamforming
fractional delay
