具有自适应可调误差半径的鲁棒波束赋形算法  

Robust adaptive beamforming algorithm with adjustable error radiuses

作　　者：张涛[1] 孙利国[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学技术系,安徽合肥230027

出　　处：《电波科学学报》2015年第1期49-56,共8页Chinese Journal of Radio Science

摘　　要：传统的自适应波束形成器对各类型的阵列误差较为敏感尤其是在较大的波达方向(Direction of Arrival,DOA)误差存在的情况下,阵列的输出信干噪比严重下降.为了解决这个问题,文中提出了一种新的具有自适应可调误差半径的鲁棒波束形成器.每一步迭代都是以经典的鲁棒Capon波束形成器为基础,且使用的误差不确定度都是依据子空间投影定理推导出的一个二次约束二次规划问题的最优解.由于估计出的导向矢量不确定度均小于传统自适应波束形成器中使用的误差量,因此,阵列的输出性能得以提高.此外,为了能够扩展算法的适用性,引入了可变椭圆不确定集来同时处理多重误差因素.最终的实验结果证明了算法的正确性和有效性.The traditional adaptive robust beamformer is sensitive to various of array imperfections.And the output array performance suffers deterioration,especially in the presence of large direction of arrival(DOA)mismatch.To overcome performance degradation,a new iterative robust beamformer is introduced with adjustable error radiuses.Each radius is the optimal solution of a quadratically constrained quadratic program(QCQP)problem,which is derived from based on the subspace principle.Additionally,the output signal to noise and interference(SINR)is improved on the fact that all the estimated mismatch levels are smaller than the ones used in the conventional methods.Moreover,the proposed method is extended to tackle with multiple mismatches together using adjustable ellipsoid uncertainty sets.Finally,the new beamformer is compared with other approaches in the simulations.And its superiority is demonstrated.

关 键 词：自适应波束形成器 信干噪比 鲁棒Capon波束形成器 

分 类 号：TN911.7[电子电信—通信与信息系统]