Direction-of-Arrival Estimation of Coherent Sources with Coprime Array Interpolation

Compared with traditional uniform linear array, coprime arrays are capable of achieving increased degrees of freedom (DOF) in virtue of the idea of difference coarray. However, the existence of holes in coarray prevent the utilization of the full coarray. The interpolation based on the covariance matrix reconstruction approach (CMRA) and the unclear norm minimization (NNM) are effective to deal with such hole problem, but its performance would severely deteriorate for dealing with coherent source. In this paper, an efficient coprime array interpolation method based on atomic norm minimization (ANM) is proposed. By using dual method and Vandermonde composition, coherent sources can be identified efficiently. The numerical simulations are presented to verify the improved performance of the proposed method.