一种宽带恒定束宽数字波束形成器的设计
Design and Implementation of Digital Beamformer for Wideband Constant Beamwidth
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摘要: 该文提出了一种应用DFT正交预处理在数字波束形成（DBF）天线上实现宽带恒定束宽方向的方案。DFT正交预处理将宽带输入信号分解为频带内不同频率点的正交输出信号。采用遗传算法对参考频率上的复数权向量进行设计使陈列响应满足给定的方向图要求。其它频率点上满足宽带恒定束宽要求的复权向量可以根据参考频率上的复数权值通过折算求得。计算机方针结果表明该方案是有效的。Abstract: This paper presents a scheme using the DFT orthogonalizing pre-process to implement a wideband constant beamwidth pattern for the digital beam-forming antenna array.This pre-process decomposes the input wideband signals into orthogonal outputs at discrete frequency points in a relevant frequency band.The complex weighting vector at the reference frequency is evaluated using Genetic Algorithm to make the array reponse cater for the pattern specified. The complex weighting vectors at other frequencies satisfying the request of wideband constant beamwidth can be deduced from the one at the reference frequency.The results of computer simulation show this scheme is effective.
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