Nonlinear signal processing and nonuniform linear antenna array design for DOA estimation of coherent sources

This paper discusses one solution technique for an optimisation problem involving nonuniform linear array (NLA) geometry. This NLA design problem seeks an optimal geometry from the class of fully-augmentable arrays (ie. those with a complete set of intersensor differences) created to support the generalised spatial smoothing (GSS) algorithm, whose aim is to resolve the directions-of-arrival (DOA’s) of some number of fully correlated signals. This problem is identified as an integer multicriteria optimisation (MO) problem. Presented results indicate that significant improvements in DOA estimation accuracy may be achieved by such optimised geometries compared with uniform or minimumredundancy arrays.