Aperture Maximization with Half-Wavelength Spacing, via a 2-Circle Concentric Array Geometry that is Uniform but Sparse
Musyoka Kinyili *
Department of Mathematics, Computing and Information Technology, University of Embu, Embu, Kenya.
Dominic Makaa Kitavi
Department of Mathematics, Computing and Information Technology, University of Embu, Embu, Kenya.
Cyrus Gitonga Ngari
Department of Mathematics, Computing and Information Technology, University of Embu, Embu, Kenya.
*Author to whom correspondence should be addressed.
Abstract
This paper proposes a new sensor-array geometry (the 2-circle concentric array geometry), that maximizes the array's spatial aperture mainly for bivariate azimuth-polar resolution of direction-of-arrival estimation problem. The proposed geometry provides almost invariant azimuth angle coverage and oers the advantage of full rotational symmetry (circular invariance) while maintaining an inter-sensor spacing of only an half wavelength (for non-ambiguity with
respect to the Cartesian direction cosines). A better-accurate performance in direction nding of the proposed array grid over a single ring array geometry termed as uniform circular array (UCA) is hereby analytically veried via Cramer-Rao bound analysis. Further, the authors demonstrate that the proposed sensor-array geometry has better estimation accuracy than a single ring array.
Keywords: Antenna arrays, array signal processing, direction-of-arrival estimation, parameter estimation, planar circular arrays