基于子空间投影的波束形成算法性能分析  

Performance analysis of the beam-forming algorithm based on subspace projection

作　　者：李永艳[1] 余小游[1] 曹守富[1] 孙广富[2] 

机构地区：[1]湖南大学信息科学与工程学院,湖南长沙410082 [2]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《电子技术应用》2015年第10期88-91,共4页Application of Electronic Technique

摘　　要：全球导航卫星系统(GNSS)接收机采用自适应天线阵进行抗干扰时,传统的自适应算法形成的旁瓣增益较大,干扰信号方向零陷较宽,会滤除部分有用信号。针对传统自适应算法的不足,分析了基于子空间投影的抗干扰波束形成算法,先采用正交子空间投影技术消除接收信号中的强干扰信号,再通过一种加权准则提高信号质量,可避免传统自适应算法的缺点。仿真结果表明,与单一的加权准则、子空间投影技术与线性约束最小方差准则相结合的算法相比,子空间投影技术与最大化信噪比准则相结合的算法能够得到近似相等的信噪比,且在干扰方向形成较窄的零陷,从而提高系统抗干扰性能。Global navigation satellite system（GNSS） receiver adopts adaptive antenna array for anti-jamming, the traditional adaptive algorithm may form greater side lobe gain, the null steering is wide in the direction of arrival of interference signal, filtering out some useful signal. For the shortcomings of traditional adaptive algorithm, this paper focuses on beam-forming algorithms based on subspace projection, firstly, adopts orthogonal subspace projection technique to eliminate strong interference signals from received signals, and then improves the signals＇ quality through a weighted criterion, avoiding the shortcomings of traditional adaptive algo- rithm. The simulation results show that the subspace projection technique respectively combines with maximize SNR criterion before correlation or LCMV criterion, and then gets approximately equal SNR, forms a narrow null compared with a single weighted criteri- on, improving system anti-jamming performance.

关 键 词：子空间投影 天线阵 波束形成 最大信噪比 

分 类 号：TN911[电子电信—通信与信息系统]