DIRECTION FINDING OF COHERENT SOURCES WITH NONLINEAR ARRAYS

This paper presents an approach to estimate the directions-of-arrival (DOAs) of narrowband coherent (completely corrected) signals by an arb itrary geometry sensor array. The concept of focussing matrices is int roduced to estimate the outputs of a virtual uniform linear array from the outputs of the real array in order to use spatial smoothing techn iques. Unlike the work presented in [5], the proposed approach avoids multiple singular value decomposition (SVD) computations in the variou s sectors because it is not necessary to divide the field of view of t he array into sectors. Simulation results are given to support the app roach.