Abstract
In the field of array signal processing, the detection of the number of signals and estimation of the direction of arrival (DOA) of signals are two important issues. They are generally solved separately with some algorithms dedicated to detection and other algorithms dedicated to DOA estimation. In this paper, an integrated method called SATDE(Synthetic Aperture Technique based Detection and Estimation) is proposed for multi-target detection and DOA estimation by underwater moving array. The proposed method exploits the synthetic aperture technique to achieve high angular resolution and the energy detection idea embodied in minimum variance distortionless response(MVDR) spectrum function to determinate the number and DOA of signals at the same time. Simulations and experimental studies show that the proposed method yields better detection performance than conventional detection methods such AIC and MDL for closely-spaced coherent signals and produces correct DOA estimations at the same time.
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