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access icon openaccess Decoupling self-correcting method for non-uniform dual circular array

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 20/02/2019, Accepted 02/05/2019, Published 30/05/2019

According to the structural characteristics of non-uniform dual circular array (NDCA), a new method is proposed to solve the problem of mutual coupling error. In this algorithm, solving the mutual coupling problem of NDCA can be equivalent to solving that of non-uniform linear array (NLA). Firstly, the mutual coupling matrix is divided into several blocks. Then, each sub-block can be decomposed into the sum of several matrices with special characteristics by matrix addition method. As a result, the signal angles and mutual coupling coefficients can be conveniently decoupled. Compared with the iterative self-calibration algorithm, the proposed algorithm has a small amount of calculation. Moreover, it neither requires any prior information nor has problem of local convergence. The new method can accurately estimate the signal directions and mutual coupling coefficients.

Inspec keywords: iterative methods; array signal processing; antenna arrays; calibration; direction-of-arrival estimation; matrix algebra

Other keywords: mutual coupling problem; nonuniform dual circular array; mutual coupling coefficients; NDCA; nonuniform linear array; structural characteristics; mutual coupling matrix; mutual coupling error; matrix addition method; decoupling self-correcting method

Subjects: Interpolation and function approximation (numerical analysis); Algebra; Signal processing and detection; Other topics in statistics; Measurement standards and calibration; Antenna arrays

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