Kinyili, MusyokaKitavi, Dominic M.Ngari, Cyrus G.2019-06-062019-06-062019-05Journal of Advances in Mathematics and Computer Science 32(3): 1-20,2456-9968http://repository.embuni.ac.ke/handle/embuni/2166This 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.enAntenna arraysarray signal processingdirection-of-arrival estimationparameter estimationplanar circular arraysArticle