Mutual coupling calibration algorithm of array antennas and its error estimation

Based on subspace principle and matrix perturbation theory, this paper presents a new mutual coupling calibration algorithm for uniform antenna array when azimuth of calibration source is in the presence of errors. By using one calibration signal source, the new approach can present the approximate estimation of mutual coupling matrix that has least error upper limit in the meaning of statistical average when the azimuth of the calibration source is inaccurate. Computer simulations are presented. The simulations show the validity of the new calibration algorithm.