Improved finite samples resampling for unbiased wide-band direction of arrival estimation

摘要

This paper considers wide-band DOA estimation using the spatial resampling method forcoherent averaging. In this paper a rough estimate of the resampling error distribution is obtained.Careful examination of this distribution yields an improved resampling formula suitable for, but notlimited to, arrays with finite sensors. It is shown that the proposed formula yields resampling errormuch less than that of conventional resampling. Moreover it is shown how the resampling error can bemore reduced by proper choice of the focusing frequency. Based on the this resampling formula aperfect focusing scheme is then proposed and its performance is evaluated and compared to otherwide-band methods through simulations. Simulations showed quite satisfactory and robust perform-ance of the proposed scheme. It was shown that it succeeds in situations where all considered wide-band methods fail. In addition it is bias-free and can be implemented quite efficiently. Hence it is quitesuitable for reliable real-time DOA estimation in reverberant environments.