Controlling an optical sensor’s line of sight (LOS) with an inertial stabilization system carried out on a dynamic platform is a challenging engineering task. The LOS needs to track a target object accurately despite intentional maneuvers, inadvertent motions, and additional disturbances. In this study, a super-twisting sliding mode controller (STSMC) is implemented to overcome this problem. The controller is designed based on the analysis of system dynamics. The stability is then proved to be satisfactory by the Lyapunov theory. Then, the control law is validated through experimental studies. In addition, a comparison to the performance of a linear controller is derived so that the effectiveness of the proposed controller is validated.
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To maintain communication quality of a mobile satellite antenna system without disconnection, the satellite tracking technique is required. There are two major tracking methods called step tracking and monopulse tracking, which utilize satellite signals as a tracking feedback. The monopulse tracking method provides fast and accurate tracking performance, whereas it can be used only in limited small regions near the satellite’s direction. In the case of step tracking method, it can be applied in relatively large regions. However, this method also has a limitation, in that it cannot provide fast and accurate tracking performance near the satellite direction. In this paper, a hybrid tracking method composed of step tracking mode and monopulse tracking mode is proposed. The proposed tracking method can present accurate tracking performance near the satellite direction as well as be applied in relatively large regions.
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