信号相关性与修正MUSIC算法二维波达方向估计

2-D direction of arrival estimation based on signal correlation and modified MUSIC algorithm

实际环境中相干信号源是普遍存在的,但传统的多信号分类(MUSIC)二维测向算法不能处理相干信号的问题,为此,采用修正MUSIC(MMUSIC)算法进行二维波达方向(DOA)估计,将修正MMUSIC算法的应用范围由一维的均匀线阵(ULA)扩展到二维中心对称阵,并理论推导出MMUSIC算法的测向性能与信号相差的余弦值呈反比。仿真实验中,二维MMUSIC对相隔4°以上两相干信号的分辨概率能够达到90%以上。

The coherent signal is widespread in the actual environment. Concerning the problem that traditional 2-D Direction Of Arrival （DOA） algorithm of Multiple Signal Classification （MUSIC） cannot process the coherent signal, the Modified MUSIC （MMUSIC） algorithm was used to realize the 2-D DOA estimation for the coherent imaginaries signal. The applied range of the modified MUSIC algorithm was extended from 1-D Uniform Linear Array （ULA） to 2-D centre-symmetric array, and it had been deduced by theory that bearing performance of MMUSIC algorithm was inversely proportional to the cosine value of phase difference. For two coherent signals of being separated by more than 4 degrees, the successful probability of the 2-D MMSUIC algorithm can be more than 90% in simulation experiments.