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In this study, to achieve high trajectory tracking performance in electro-optical tracking systems under strong nonlinear disturbances and uncertainties, we develop a nonlinear extended state observer (ESO) based fractional-order sliding mode control. When compared with previous work, the new compound control strategy is attractive in terms of the following three points. First, a novel controller is developed that integrates the advantages of a nonlinear ESO, a fractional-order nonsingulardoi:10.1109/access.2021.3067680 fatcat:27qu3ovhrbd2lfqr6xv5t6cj3m