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논문 기본 정보

저자정보
(Changwon National University) (Woods Hole Oceanographic Institution) (University of California)
저널정보
한국소음진동공학회 한국소음진동공학회논문집 한국소음진동공학회논문집 제35권 제4호(통권 285호)
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    초록·키워드

    Estimating the direction-of-arrival (DOA) at low frequencies is challenging owing to the inadequate spatial resolution of conventional delay-and-sum beamforming. This study presents an alternative approach based on generalized frequency-sum (gFS) processing, which constructs higher-order spectral autoproducts up to a selected order Q. By combining frequency components, the method enhances spatial resolution when the acoustic wavelength exceeds the array aperture. The upper limit of Q is governed by the condition that the resulting frequency sum remains below the spatial Nyquist limit; in practice, this bound is further limited by noise. In addition, through a framework based on multinomial expansion, we demonstrate that gFS is inherently unsuitable for resolving multiple DOAs. Numerical simulations and experiments confirm that this technique offers a viable solution for single-source DOA estimation in the low-frequency regime.

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      UCI(KEPA) : I410-151-25-02-093856966