Mutual coupling calibration using the Reiterative Superresolution (RISR) algorithm

An integral element of a blind array calibration routine is an estimate of the direction of arriving signals. The work herein integrates the Reiterative Superresolution (RISR) algorithm into a calibration framework suitable for estimating the array mutual coupling. The RISR algorithm is a recursive minimum mean-squared error (RMMSE) Direction of Arrival (DoA) estimator that does not require a Sample Covariance Matrix (SCM) be computed. In addition, the RISR algorithm directly estimates the spatial spectrum, rather than just the angle measurement, making it well suited for assessing the array mutual coupling. Here a calibration method is derived using RISR to estimate mutual coupling. The effectiveness of the approach is via simulation.