非均匀线阵的快速求根MUSIC方法  

Fast Root MUSIC for Non-Uniform Linear Array

作　　者：陈柱学[1] 吴建新[2] 

机构地区：[1]中国电子科技集团公司第三十八研究所,安徽合肥230088 [2]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《雷达科学与技术》2014年第2期166-170,175,共6页Radar Science and Technology

摘　　要：相对于均匀阵列,非均匀阵列在增大天线孔径、避免栅瓣方面具有明显优势。针对非均匀线阵DOA估计带来的高计算量问题,提出了一种快速的实多项式求根MUSIC方法。该方法利用小角度范围内的导向矢量可以利用低阶多项式很好近似的特性,将非均匀线阵DOA估计问题转化为多组低阶实多项式求根问题。由于低阶实多项式具有计算量小以及数值稳定性好等优点,而且多组多项式求根可以并行实现,该方法能够快速地实现非均匀线阵DOA估计,非常适合于工程应用。Compared to the uniform linear array（ULA）,the non-ULA has an advantage on increasing antenna size and avoiding grating lobes.Considering the fact that DOA estimation for non-uniform linear ar-ray（non-ULA）is computationally expensive,a fast root MUSIC estimator is developed here.The presented method utilizes the characteristic that steering vectors in small angle area can be well approximated by low-or-der polynomial,DOA estimation for non-ULA can be converted into multiple groups of low-order polynomial rooting.Due to low computational complexity and good numerical stability of low-order polynomial,the presented method can realize DOA estimation efficiently and is very suitable for engineering applications.

关 键 词：非均匀阵列 DOA估计 MUSIC算法 多项式求根 

分 类 号：TN957[电子电信—信号与信息处理]