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MUSIC算法对信号DOA的应用

于 2022-06-30 发布 文件大小:1.06 kB
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波达方向(DOA)估计的基本问题就是确定同时处在空间某一区域内多个感兴趣的信号的空间位置(即多个信号到达阵列参考阵元的方向角)。最早的也是最经典的超分辨DOA估计方法是著名的MUSIC方法,MUSIC是多重信号分类(Multiple Signal Classification)的英文缩写。它是由R.O. Schmidt于1979年提出来的,由1986年重新发表的。MUSIC算法利用了信号子空间和噪声子空间的正交性,构造空间谱函数,通过谱峰搜索,检测信号的DOA.它是建立在以下假设基础上的:(1) 阵列形式为线性均匀阵,阵元间距不大于处理最高频率信号波长的二分之一;(2) 处理器的噪声为加性高斯分布,不同阵元间距噪声均为平稳随机过程,独立同分布,空间平稳(各阵元噪声方差相等);(3) 空间信号为零均值平稳随机过程,它与阵元噪声相互独立;(4) 信号源数小于阵列元数,信号取样数大于阵列元数,信号源为窄带信号,即信号通过天线阵的时间远远小于信号带宽的倒数.

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