Robust Joint Calibration of Mutual Coupling and Channel Gain/Phase Inconsistency for Uniform Circular Array

A new robust method is designed to estimate mutual coupling and channel gain/phase inconsistency parameters for a uniform circular array (UCA) jointly. It only needs a single signal source and two trials with different impinging directions to complete the calibration. The directions of the trials do not need to be calibrated beforehand. First, the two kinds of parameters are uncoupled into a linear equation in discrete Fourier transform (DFT) beam space by a novel decoupling technique. Then, a new object function is set according to the symmetry of the mutual coupling parameters. Finally, with some prior directional information, all the parameters can be estimated through a limited angular search. Simulations verify the effectiveness and robustness of the proposed method.