(2019-05) Kinyili, Musyoka; Kitavi, Dominic M.; Ngari, Cyrus G.
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 o ers 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 veri ed via Cram er-Rao bound analysis. Further, the authors
demonstrate that the proposed sensor-array geometry has better estimation accuracy than a
single ring array.