摘要
针对自适应波束形成器在干扰位置出现扰动时的输出性能下降问题,该文提出一种新的零陷展宽算法。该算法基于投影变换与对角加载技术的结合,首先利用投影变换技术对阵列接收数据进行预处理,结合对角加载技术,以此构造出一个新的协方差矩阵替代原来的协方差矩阵,再利用自适应波束形成技术得到零陷展宽后的波束图。仿真结果表明,该方法能有效展宽波束零陷宽度,加深零陷深度,达到抑制位置出现扰动的强干扰信号目的。该算法易于求解,对参数的选取具有较强稳健性,在低快拍条件下,依然能有效地工作,增强了自适应波束形成器稳定性。
Since the adaptive beamformer suffers from the output performance degradation when the position of the interference moves, a new null broadening technique is proposed. The algorithm uses the projection technology to transform the array receives data, combined with diagonal loading techniques to get the new covariance matrix. The original covariance matrix is replaced by a new covariance matrix as such, and then a null broadening beam can be obtained using the adaptive beamforming technique. The simulations results show that this method can effectively broadening the beam null width and enhance the null depth, so the new algorithm can suppress strong interference with rapid movement; and the algorithm is easy processing, which can still work effectively even in the condition of low snapshot, the algorithm enhanced robustness of the beamformer.
出处
《电子与信息学报》
EI
CSCD
北大核心
2014年第12期2882-2888,共7页
Journal of Electronics & Information Technology
基金
国家自然科学基金(51209055)
国家部委基金
中央高校基本科研业务费专项基金(HEUCFT1304)资助课题
关键词
波束形成
零陷展宽
投影变换
对角加载
Beamforming
Null broadening
Projection transformation
Diagonal loading
