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이상효(Sanghyo Lee),이인석(Ihnseok Rhee),기창돈(Changdon Kee),구훤준(Hueonjoon Koo) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.1
This paper deals with designing a ground-based longitudinal landing controller which is robust to datalink time delays. Time delays occur because forward velocity measurements are downlinked and the controller output commands are uplinked. An H∞, controller was designed by using the input/output decomposition where time delay is modeled as a first-order system with Pade approximation. Linear simulations show that the system tracks well the predefined path and is robust to the variation of time delay.