基于改进迭代FFT算法的均匀线阵交错稀疏布阵方法  

Interleaved Thinned Linear Arrays Based on Modified Iterative FFT Technique

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：《电子与信息学报》2016年第4期970-977,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金项目(61172148)~~

摘　　要：基于孔径空分复用的共享孔径交错稀疏布阵是实现机载多功能天线的有效途径。该文提出一种基于改进迭代FFT算法的均匀线阵交错稀疏布阵方法。基于均匀线阵天线激励与方向图的傅里叶变换关系,通过对目标方向图采样的频谱分析,采用交叉选取子阵激励的方法对子阵单元进行稀疏优化布阵,实现了子阵频谱能量的均匀分配,确保了交错稀疏子阵方向图的一致性。在此基础上采用迭代FFT算法对稀疏交错子阵进行联合优化。理论分析与仿真实验表明,相对于基于差集及遗传算法的稀疏交错优化方法,该算法通过较少次数的迭代,可以实现等稀疏率和方向图近似一致的交错稀疏布阵,而且可以获得更低的副瓣电平。Interleaved thinned arrays sharing aperture based on the aperture ratio of reuse is an effective way to realize airborne multifunction. A new method to interleave thinned linear arrays is proposed in this paper based on the modified Iterative Fast Fourier Transform（IFFT） algorithm. The sub-arrays spectrum energy distributed is achieved evenly by making the Fourier transform to linear array antennas＇ excitation, analyzing the frequency spectrum and selecting the incentive crossly to ensure the positions of the thinned sub-array antennas. On this basis, the iterative FFT algorithm is adopted to thin the linear array. The simulations show that compare with the difference sets and the genetic algorithm, this technique can ensure the first subarray under the condition of thinned optimization, at the same time, the Peak Sidelobe Level（PSL） of the second subarray is similar to the first sub-array. It means that the new method is effective to restrain the side lobe levels and useful to interleaved array optimization.

关 键 词：阵列天线 共享孔径 稀疏交错 迭代FFT 副瓣电平 

分 类 号：TN820[电子电信—信息与通信工程]