A Joint Calibration Method for Array Gain-phase Errors and Mutual Coupling Errors

Combining the search depth of particle swarm optimization (PSO) algorithm and the search breadth of invasive weed optimization (IWO) algorithm, an offline algorithm, based on IWO-PSO for joint correction of gain-phase errors and mutual coupling errors, is proposed. Firstly, a known auxiliary source is used to establish an objective function containing both gain-phase errors and mutual coupling errors, and then the IWO-PSO algorithm is used to search for those array errors satisfying the optimal values of the objective function through an alternating iteration procedure. The proposed method does not need prior knowledge of array perturbations, and has good estimation performance of DOA and array errors. Compared with other calibration methods based on optimization algorithms, the RMSE curve of the proposed method for DOA estimation is closer to CRB curve.