A method of direction finding for non-Gaussian wideband signals in the presence of unknown colored noise fields
Yuan Xi · Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University · 2009
To provide direction of arrival(DOA) estimation for non-Gaussian wideband signals in the presence of unknown colored noise fields,a new method was proposed which combines de-noising and a higher-order cumulant.The first step was to estimate the noise component and remove it.Next,the output array vectors at different frequency bins were transformed into the focusing frequency by a focusing operation,and this determined the individual cumulant matrix.Then the DOA was estimated using the subspace method after eigen-decomposition of the average cumulant matrix.This method is not only applicable to Gaussian colored noise,but also to non-Gaussian colored noise.Furthermore,information about the original distribution of the noise is not needed.Extensive simulations demonstrated that the algorithm has good performance.