子阵级相控阵差波束旁瓣抑制新方法  

Novel approach of sidelobe suppression for difference beam of phased array at subarray level

作　　者：邱朝阳 雷丽丽[2] 胡航[2] 董晔 

机构地区：[1]中航雷达与电子设备研究院航空电子系统射频综合仿真航空科技重点实验室,江苏无锡214063 [2]哈尔滨工业大学电子与信息工程学院,黑龙江哈尔滨150001

出　　处：《电波科学学报》2011年第1期13-17,202,共6页Chinese Journal of Radio Science

基　　金：中国博士后科学基金特别资助项目(200902412);中国博士后科学基金资助项目(20080430905);航空科学基金资助项目(20092077010);航天支撑基金资助项目(2008)

摘　　要：针对采用单脉冲技术的相控阵系统,在子阵级采用数字加权抑制差波束的旁瓣。利用遗传算法优化子阵级加权,构造了加权向量和方向图等两种适应度函数。对只使用一种适应度函数的常规遗传优化方法进行了改进,提出分阶段、多适应度函数的方法:将优化过程分为两个阶段,并分别使用加权向量和方向图参数作为适应度函数。改进方法提高了遗传优化的稳定性,提高了优化效率,改善了旁瓣抑制效果。仿真结果证明了所提出方法的有效性。Aiming at the phased array radar system which applies monopulse technology, we adopted digital weighting for suppressing sidelobe of difference beam. We presented to optimize the subarray weights by using genetic algorithm, and constructed two kinds of fitness functions;weighting vector and pattern parameters. Further, we improved the conventional genetic algorithm using only one fitness function, and partitioned the optimization process into two stages, and adopted weight vector as fitness function for the first stage and pattern parameters for the second one. The improved approach possesses satisfying stability, and avoids being constrained on local optimal solution, enhances the calculation efficiency greatly, and improves the sidelobe suppression effect. The simulation results verify the validity of the proposed approach.

关 键 词：子阵级相控阵 遗传算法 数字加权 旁瓣抑制 差方向图 

分 类 号：TN957.51[电子电信—信号与信息处理]