Improved array self calibration with large sensor position errors for closely spaced sources

Self-calibration algorithms estimate both source directions-of-arrival (DOAs) and perturbed array response vector parameters, such as sensor locations. Calibration errors are usually assumed to be small and a first order approximation to the perturbed array response vector is often used to simplify the estimation procedure. ln this paper, we improve on a previously presented technique that eliminates the small error assumption. The improved technique has better performance for closely spaced sources for both small and large calibration errors.