空间角度相近多干扰源DOA估计

DOA Estimation of Space Angle Close Multiple Interference Sources

针对空间角度相近多个干扰源DOA估计时,经典MUSIC算法估计性能与分辨效果不佳的问题,提出了一种改进的MUSIC算法。该算法利用干扰与目标回波信号的特征,划分出干扰子空间、信号与噪声子空间,重新构造了空间谱函数。通过对经典MUSIC算法与改进的MUSIC算法DOA估计的仿真分析,结果表明,在小快拍数、多干扰源空间角度相近、低信干比的情况下,改进的MUSIC算法估计性能与分辨精度更佳。

Focusing on the problem that classical MUSIC（ multiple signal classification） algorithm has poor estimation performance and bad resolution effect on DOA（ direction of arrival） estimation of close space angle with multiple interference sources,a kind of improved MUSIC algorithm is proposed. It classifies interference subspace,signal with noise subspace,and gives the new structure of space spectrum function by using the features of interference and target echo signal. Through the simulation analysis on classical MUSIC algorithm and the improved MUSIC algorithm,the result states the latter has the better estimation performance and resolution effect,especially,for instance,a small number of snapshots,the low SIR（ signal interference ratio） and closer space angel