基于等功率加载的鲁棒自适应波束形成算法-信息工程大学学报.PDF

Vo l. 12 No.5 第 12 卷第 5 期 信息工程大学学报 2011 年 10 月 Journal of Information Engineering University Oct. 2011 基于等功率加载的鲁棒自适应波束形成算法 唐涛，姚晖，吴江 (信息工程大学信息工程学院，河南郑州 450002) 摘要:常规鲁棒波束形成算法只适合特定误差形式，针对阵列幅相误差、期望指向误差和干扰 数据失配等多种误差同时存在的情况，提出了基于等功率加载的鲁棒自适应波来形成算法。 新算法通过斜投影矩阵估计出期望信号功率，且构造一组与期望信号功率相等的非相干虚拟 信号，这样改进的好处是虚拟干扰功率与期望功率相等，使得宽零陷性能稳定优越，特别适合 期望信号与干扰信号功率相差较大的情况。并且通过不确定集合约束保证算法在阵列误差和 期望指向误差下主瓣性能稳定优越，给出了求解 Lagrange 乘数的数学公式，证明了迭代权值会 收敛于最优权值。通过计算机仿真结果验证了新算法多种误差环境下的有效性与优越性。 关键词:自适应波束形成;鲁棒性;数据失配;斜投影;最坏情况性能优化 中图分类号:TN957 文献标识码:A 文章编号: 1671 - 0673 (201 1)05 - 0555 - 05 Novel Robust Adaptive Beamforming Algorithm Based on Equivalent Power Loading TANG Tao , YAO Hui , WU Jiang (Institute of Information Engineering , Information Engineering University , Zhengzhou 450002 , China) Abstract: Conventional robust beamforming algorithms are applicable to some conditions with special eπors. To deal with complicated situations where aηay amplitude and phase errors ,desired-orienta- tion errors and other data mismatch coexist , this paper puts forward a novel robust adaptive beam- forming algorithm based on equivalent power loading. The new algorithm estimates the power of de- sired signals by oblique projection property to add some interference signals and form a matrix. These interference signals have equivalent power as the desired signal. The equivalence of power leads to superior stability of wide null controlling. This processing is specially suited to situations where the desired signal po