Accurate Direction-Of-Arrival Estimation Using Second-Order Differential of MUSIC Spectrum

K. Ichige, Y. Ishikawa, H. Arai
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引用次数: 9

Abstract

This paper presents a high resolution direction-of-arrival (DOA) estimation method using second-order differential of the MUSIC spectrum. MUSIC method is paid attention as one of "superresolution" DOA estimation methods because of their brilliant characteristics, however MUSIC also has the problem of estimation accuracy in severe environments like low SNR, small number of snapshots, or incident waves from close angles. We now pay attention to the fact that the second-order differential of the MUSIC spectrum makes negative peaks around the original DOAs even when the MUSIC spectrum does not make peaks there. We try to estimate DOAs not by MUSIC spectrum but by the second-order differential of the MUSIC spectrum, and find its peaks for being estimated DOAs
基于MUSIC频谱二阶微分的精确到达方向估计
提出了一种基于MUSIC频谱二阶微分的高分辨率到达方向估计方法。MUSIC方法作为“超分辨”DOA估计方法之一,因其出色的特性而备受关注,但在低信噪比、少量快照或近角度入射波等恶劣环境下,MUSIC方法的估计精度存在问题。我们现在注意到这样一个事实,即MUSIC频谱的二阶微分在原始doa周围产生负峰,即使MUSIC频谱在那里没有峰。我们尝试通过MUSIC谱的二阶微分来估计doa,而不是通过MUSIC谱来估计doa,并找到用于估计doa的峰值
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