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

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