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This paper studies the landing control problem for Unmanned Aerial Vehicles (UAVs) on an oscillating platform such as a ship deck in a rough sea. A full nonlinear mathematical model is first introduced for the UAV in an inertial frame. A Fourier transform based method is then employed for a realistic characterization of the sea motion and the ship dynamics. Finally, a landing control algorithm is...
This paper studies the three-axis attitude stabilization problem for a nadir-pointing spacecraft using only magnetic torquers as actuators. Since magnetic control systems are relatively lightweight, require low power and are inexpensive, they are attractive for small, inexpensive satellites in low Earth orbits. In this paper we present three-axis attitude control algorithms for small satellites using...
This paper studies the thrust vector control problem for an upper-stage rocket with fuel slosh dynamics. The control inputs are the gimbal deflection angle of a main engine and a pitching moment about the center of mass of the spacecraft. It is assumed that the rocket acceleration due to the main engine thrust is large enough so that surface tension forces do not significantly affect the propellant...
The objective of this paper is to design an effective control scheme for an asteroid orbiting satellite. The paper first introduces the dynamics formulation of such satellites and then provides a framework for the control system design. The control objective is to achieve a nadir pointing attitude on a circular equatorial orbit. Lyapunov-based nonlinear feedback laws are constructed to control the...
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