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An adaptive technique for the estimation and tracking of the direction of arrival of multiple nonstationary plane waves from the outputs of a uniform linear array of sensors is presented. This task is performed by using a decomposed filtering structure to spatially isolate each signal component while a second stage is used to estimate the parameters of interest (angle of arrival). This results in a computationally simple algorithm suitable for the case of large arrays which enables the tracking of rapidly moving sources. The proposed approach is also applicable to the case of coherent signals. [Copyright &y& Elsevier]