基于均匀线阵的改进MUSIC算法

Research on Improved Algorithm of MMUSIC Based on ULA

在相干信源下,传统的MUSIC(MUltiple SIgnal Classification)算法不能准确地估计波达方向。为此,在对传统的MUSIC算法进行研究的基础上,提出了一种改进的MUSIC算法。该算法是将阵元接收的数据做相应的变换,从而得到新的阵列数据,再通过求互协方差等运算,得到新的数据协方差矩阵。同时,对该算法和传统的MUSIC算法进行了仿真,对其DOA(Direction-of-Arrival)估计性能进行比较。仿真实验表明,改进后的算法在相干信源的情况下具有很好的去相干性能,而且没有阵列孔径的损失。能精确地估计信号的波达方向。

When signal is coherent,the MUSIC（MUltiple SIgnal Classification） canwot estimates the direction-of-arrival accurately.To conquer this problem,a new modify-MUSIC algorithmic is put forward.The principle of this new algorithmic is to calculate the cross covariance.Moreover,the new algorithmic has no loss of array aperture.The new algorithmic and the MUSIC algorithmic are simulated,then compare performances of the MUSIC algorithmic to that of the new algorrithmic.the result indicates that the new modify-MUSIC algorithmic is good at estimating the direction-of-arrival accurately when signals are coherent.