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Characteristic analysis of dual circular array

In this paper, the characteristics of two different uniformly spaced circular arrays are analyzed, including the beam width, the sidelobe peak level, the resolution and the Cramer-Rao bound(CRB) of the array. Firstly, according to the structure of the dual circular array, the formula of array pattern, the formula of resolution and the formula of CRB are deduced. Secondly, the effects of the elements number and the radius of the array on the beam width, sidelobe level, resolution and CRB are analyzed theoretically. Thirdly, a lot of simulations are used to verify the validity of the theoretical analysis. All of these provide a theoretical reference for setting the number and the location of array elements in application reasonably.