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This paper presents multiple snapshot spatial smoothing with improved aperture (MS-SSIA) for high-resolution direction of arrival (DOA) estimation by uniform linear array (ULA). Spatial smoothing preprocessing (SSP) is often used for DOA estimation of correlated sources, but it reduces the effective array aperture and leads to low DOA estimation accuracy. SSIA and SSOA improve the problem of SSP but they have some other problems. This paper tries to improve SSIA so that it can correspond to the case of multiple snapshots, but we take a different approach with SSOA. The performance of the proposed method is evaluated through computer simulation.

MS-SSIA: multiple snapshot spatial smoothing with improved effective array aperture for high-resolution DOA estimation