Abstract: This study investigates prescribed-time position tracking control for electromagnetic satellite formations subject to model uncertainties and external disturbances. Using the Clohessy-Wiltshire equations as the relative motion dynamics model, a prescribed time output feedback control strategy is proposed. A prescribed-time extended state observer is designed to estimate the relative velocity and external disturbances. The disturbance estimates are then used as the feedforward component of the controller. Building on this framework, a novel prescribed-time active disturbance rejection control strategy for position tracking is developed via a backstepping control design. The convergence of the extended state observer and the stability of the closed-loop system are rigorously analyzed using Lyapunov stability theory. Numerical simulations are performed to validate the effectiveness of the proposed controller.