摘要
针对已存在的各种二维capon波束形成器稳健算法性能单一,只能对1种或2种影响波束形成算法性能的因素具有稳健性,缺乏对多种情况都具有稳健性的缺点,提出一种基于空间谱估计的二维稳健自适应波束形成方案。首先,提出一种新的二维解相关空间谱估计算法,该算法将二维角度估计问题用4个一维空间谱估代替,并采用修正的MUSIC算法实现解相干,然后利用得到的角度信息构造虚拟干扰,克服观察方向误差并展宽零陷。仿真结果表明:该算法结合了空间谱估计技术和自适应波束形成技术的优点,对期望信号导向矢量误差、干扰到达角失配及信号相关等都具有足够的稳健性。
The existing two-dimensional robust adaptive beamforming algorithms only have simplex function, and the multifunctional robust beamforming algorithms are scarce. Aiming at all the cases which lead to performance degradation, an improved two-dimensional robust adaptive beamforming algorithm combined with spatial spectrum estimation technology was considered. Firstly, a new two-dimensional spatial spectrum estimation algorithm was proposed. This method utilized four one-dimensional spatial spectrum estimations to estimate the directions of the signals, and the modified MUSIC algorithm was used to estimate the coherent signals. Then the weight vector was calculated via virtual interferences constructed with the aid of angle information. Simulation results show that the algorithm simultaneously has the advantages of the adaptive beamforming technology and the spectrum estimation technology, and has sufficient robustness for steering vector error, interference angle of arrival mismatch and signal interrelation.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第6期2339-2345,共7页
Journal of Central South University:Science and Technology
基金
中央高校基本科研业务费专项项目(HEUCF120802)
国家自然科学基金资助项目(61201410)
关键词
二维自适应波束形成
稳健性
空间谱估计
修正的MUSIC
虚拟干扰
two-dimensional adaptive beamforming
robustness
spatial spectrum estimation
modified MUSIC
virtualinterfaces
