双约束稳健Capon波束形成算法的分析与求解  

Analysis and solution for double constraint robust Capon beamforming algorithm

作　　者：刘聪锋[1] 廖桂生[2] 

机构地区：[1]西安电子科技大学电子对抗研究所,陕西西安710071 [2]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2011年第3期477-481,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(61072107);国家杰出青年基金(60825104);中国博士后科研基金(20090451251);陕西省工业攻关项目(2009K08-31);中央高校基本科研业务费专项资金(JY10000902025)资助课题

摘　　要：针对Capon波束形成算法在导向矢量的不确定集和模约束下的求解问题,提出了新的分析和求解方法。通过对最优化问题进行深入分析,发现不确定集约束决定该算法的性能,而模约束只是起辅助约束作用,因此可以通过对不确定集约束Capon波束形成算法的解进行标量化处理,使其满足模约束而获得该算法的最优解。所提出方法不仅使得不确定集约束参数的选择更加简单,同时使得波束形成算法的性能改善达到最优。发现不确定集约束参数选择得越大,算法的性能改善越接近于最优,而此时对应于负加载。仿真分析验证了方法的正确性和有效性。For the problem of solving the Capon beamforming algorithm under the uncertainty set and norm of the steering vector,a novel analyzing and solving method is proposed.Via analyzing the characteristic of the optimization problem deeply,it is found that the uncertainty set constraint determines the performance,but the norm constraint is accessorial.Therefore,the optimal solution to this algorithm will be obtained by the solution of the Capon beamforming algorithm under the uncertainty set constraint scaling to meet the norm constraint.According to the proposed algorithm,the selection of the steering uncertainty constraint parameter becomes more simple.Moreover,the improvement performance of the beamforming algorithm can reach the optimal.It is also found that the greater the constraint parameter is selected,the more close to optimal is the performance of the beamforming algorithm.The simulation attests its correctness and effectiveness.

关 键 词：自适应波束形成 Capon波束形成器 不确定集约束 模约束 负对角加载 

分 类 号：TN911[电子电信—通信与信息系统]