一种可有效降低运算代价的子阵级波束扫描的旁瓣抑制方法  

A Kind of Sidelobe Suppression Approach with Effective Reduction of Computation Cost for Beam Scanning at Subarray Level

作　　者：胡航[1] 刘伟会[1] 吴群[1] 

机构地区：[1]哈尔滨工业大学电子与信息技术研究院,哈尔滨150001

出　　处：《电子与信息学报》2009年第8期1867-1871,共5页Journal of Electronics & Information Technology

基　　金：中国博士后科学基金(20080430905);航天支撑基金项目资助课题

摘　　要：在子阵级相控阵中,对于多波束形成等很多应用,需要在子阵级进行数字波束扫描。此时抑制扫描方向图的旁瓣是一个重要问题,而其关键在于构造有效的子阵级加权网络。该文将整个阵列作为一个超阵、将每个子阵作为一个超元来考虑,基于用超元方向图近似表示真实子阵方向图的处理思想,使得构造加权网络所需要的各矩阵的维数由原来与阵元数相同降低为与子阵数相同,从而可十分显著地降低运算代价;而且可得到波束形状、宽度及增益均很接近的新的子阵方向图。该方法可在一定程度上抑制子阵级波束扫描后的阵列方向图旁瓣。仿真结果证明了其有效性。In subarray level phased array, it requires digital beam scanning at subarray level in many applications, for instance, multiple beamforming. In this case, the suppression of pattern sidelobe is critical, and the key is construction of the weighting network at subarray level. This paper considers the whole array as a super array and each subarray as a super element. Based on the concept adopting super element patterns to express approximately original subarray patterns, the dimension of each matrix which is required for constructing weighting network could reduce to the same value as subarray numbers of the array compared to the original value equaling to element numbers. Consequently, the computation cost is remarkably reduced. And all the obtained new subarray patterns are quite similar in forms, widths and gains of mainbeams. For subarray level beam scanning, the proposed approach could reduce sidelobe of array pattern to certain extent. Simulation results demonstrate its validity.

关 键 词：相控阵雷达 子阵级波束扫描 旁瓣抑制 加权网络 超元 

分 类 号：TN958.92[电子电信—信号与信息处理]