Reduction of AOA estimation error due to perturbation in array response by spatial smoothing preprocessing

In this paper, reduction of angle-of-arrival (AOA) estimation error owing to amplitude and phase perturbation in the array response using spatial smoothing preprocessing (SSP) is proposed. The performance improvement of the proposed method is validated by Monte-Carlo simulation. To show applicability of the proposed method in practice, it was applied to estimate AOAs of measured data obtained in an anechoic chamber and in an open site. According to the results, SSP can reduce the random error in the array response, thus reducing the error of estimated AOAs in the measured data.