基于分数时延的宽带数字波束形成技术

摘要

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.%　　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。