Decoupling self-correcting method for non-uniform dual circular array

• Main Authors: Jiajia Zhang, Hui Chen, Weijian Liu
• Format: Article
• Language: English
• Published: Wiley 2019-07-01
• Series: The Journal of Engineering
• Subjects: array signal processing; direction-of-arrival estimation; iterative methods; calibration; matrix algebra; antenna arrays; decoupling self-correcting method; nonuniform dual circular array; structural characteristics; NDCA; mutual coupling error; mutual coupling problem; nonuniform linear array; mutual coupling matrix; matrix addition method; mutual coupling coefficients
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2019.0347

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.