基于迭代FFT算法的平面阵列交错稀疏布阵方法  

Thinned and interleaved planar array antenna based on iterative FFT techniques

作　　者：李龙军[1,2] 王布宏[1] 夏春和[2] 

机构地区：[1]空军工程大学信息与导航学院,西安710077 [2]北京航空航天大学,北京100191

出　　处：《电波科学学报》2016年第2期387-393,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.61172148)

摘　　要：交错稀疏阵列天线的设计需要实现"稀疏布阵"和"子阵交错机制"两个关键技术的有机"协同".提出一种基于改进迭代快速傅里叶变换(Fast Fourier Transformation,FFT)算法的均匀面阵交错稀疏布阵机制.鉴于均匀矩形平面阵列天线激励与方向图存在二维傅里叶变换的关系,该方法通过对均匀面阵方向图采样的频谱能量分析,采用交错选取子阵激励的方法,实现了面阵天线方向图频谱能量的均匀分配,获得了近似相同方向图的交错子阵设计.在此基础上,采用迭代FFT算法对交错子阵激励进行迭代循环,有效降低了交错子阵的峰值旁瓣电平.理论分析与实验仿真证明,相对于基于循环差集和互补差集的稀疏交错优化方法,该算法实现的交错稀疏阵列设计具有方向图近似程度更高,且峰值旁瓣电平更低的优点.Thinned and interleaved array and subarray interleaving. A new method for design entails careful compromise between array sparseness interlacing uniform planar array based on iterative fast Fou- rier transformation （FFT） algorithm is proposed in this paper. In view of the 2D-FFT-link between the ar- ray excitation and array factor of uniform planar array, the spectrum energy distribution of the discrete ar- ray factor of uniform planar array is explored and element excitations of interleaved subarray is carefully selected in an interlaced manner, which ensures the pattern matching of the generated subarray. The peak side lobe level of the interleaved array is further reduced with the FFT algorithm. Theoretical analysis and experimental simulation shows that compared with the existing cyclic difference sets （CDS） method, the proposed algorithm can achieve favorable thinned and interleaved array design with more matched patterns and lower peak sidelobe levels.

关 键 词：共享孔径 交错稀疏阵 旁瓣峰值 循环差集 

分 类 号：TN820[电子电信—信息与通信工程]