摘要
不同于传统的相控阵,频控阵可以形成具有距离和角度依赖性的发射波束,近年来受到广泛的关注和研究。但是关于频控阵的研究主要集中在均匀线阵和均匀矩形阵上。基于均匀线阵的频控阵其发射波束存在距离和角度耦合问题,现存的解耦合的方法都是使用非线性频偏来解决耦合问题,但是非线性频偏不利于工程的实现。均匀圆阵因其结构的特殊性,可以实现360°的水平角的扫描,以及二维的DOA估计,也因其结构的特殊性,使得发射波束不存在像线阵那样距离和角度耦合的问题。因此本文提出基于同心圆阵的频控阵波束形成方法,利用同心圆结构阵列,实现频控阵的波束在目标点处聚焦。相比于其他解耦合方法,该方法使用线性频偏就可以在目标点处实现波束聚焦且具有良好性能。仿真结果表明,本文提出的方法可有效实现波束在特定时刻在目标点处进行聚焦,且具有较窄的波束宽度。
Different from the traditional phased array(PA),the frequency diverse array(FDA)can form a transmitting beam with range and angle dependence.It has been widely concerned and studied in recent years.But most of the works are on uniform linear array(ULA)and uniform rectangular array(URA).The transmitting beam of FDA based on ULA has the problem of range and angle coupling.The existing decoupling methods are all solved by using nonlinear frequency offset,but it is not conducive to the realization of engineering.Due to the special structure of UCA,it can achieve 360°horizontal angle scanning and two-dimension direction of arrival(DOA)estimation.Also because of the particularity of its structure,the transmitting beam does not exist the coupling problem of range and angle like the ULA.Therefore,in this paper,we propose the method to realize beam focusing at the target point based on concentric circular array.Compared to other decoupling methods,this method can achieve the beam focusing at the target point by using linear frequency offset and has excellent performance.Numerical simulation results are conducted to verify that the proposed method shows good performance in beam focusing at the target point at a specific time.
作者
岳爽
缪晨
吴文
YUE Shuang;MIAO Chen;WU Wen(Ministerial Key Laboratory of JGMT,NJUST,Nanjing 210094,China)
出处
《微波学报》
CSCD
北大核心
2021年第S01期262-265,共4页
Journal of Microwaves
关键词
频控阵
同心圆阵
波束聚焦
frequency diverse array
concentric circular array
beam focusing
