Robust Music Estimation Under Array Response Uncertainty

This paper addresses the problem of bearing estimation with partial knowledge on the array response. In a real life scenario, it may seem fictitious to assume a closed-form steering vector as a function of the direction of the received signal. Indeed, an antenna array is subject to many perturbations, such as calibration errors, imperfect positioning of array sensors, mutual coupling, and so on. We introduce a MUSIC estimator, hereby referred to as Robust-MUSIC, that is capable of estimating AoAs of multiple signals, when the antenna array's response is subject to uncertainties, due to the aforementioned reasons. Simulation results are also presented to demonstrate the robustness of the proposed MUSIC estimator.