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Guidance and control of magnetic space tug

Fabacher, Emilien and Lizy-Destrez, Stéphanie and Alazard, Daniel and Ankersen, Finn and PRofizi, Alexandre Guidance and control of magnetic space tug. (2017) In: ESA GNC 2017- 10th International ESA Conference on Guidance, navigation & Control Systems, 29 May 2017 - 2 June 2017 (SALZBURG, Austria).

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Abstract

Magnetic tugging of a target satellite without thrust capacity can be interesting in various contexts,as for example End-Of-Life management, or to replace launchers upper stages. The aim isto gradually modify the orbit of the target by constantly exerting on it a magnetic force. To do so, the chaser is assumed equipped with a steerable magnetic dipole, able to create both forces and torques on the magnetic torque rods carried by the target. The chaser is also supposed to carry electric thrusters, creating a continuous force which modifies the orbit of the whole formation composed of chaser and target. The relative motions of both satellites are derived, in order to assess the feasibility of such a concept. Relative configuration (attitudes and position) trajectories are derived, which are compliant with the dynamics, and enable the chaser to tug the target. Considering targets in Low Earth Orbit (LEO), the magnetic field of the Earth is taken into account, modeled by the International Geomagnetic Reference Field (IGRF). The position of the magnetic torque rod of the target may not be located at its center of mass. This lever-arm is taken into account in the dynamics. The existence of guidance trajectories was already derived and presented in [1, 2, 3]. In [2],two time-invariant LQ-based controllers are proposed, depending on the capacity of the target to control its own attitude with reaction wheels (semi-cooperative scenario). It was shown that the capability to control the attitude target using only the chaser steerable dipole (non-cooperative scenario) is weak and not efficient enough in the time-varying case. The main contribution of this paper is to consider the time-variant feature of the model linearized around the nominal trajectory tacking into account the time-varying Earth magnetic field. Then, a control methodology is proposed to design a time-variant structured controller based on a time-varying pre-controller and an time-invariant controller. The latter is designed using a fixed-structure H1 and multimodel approach. The proposed control is then evaluated through simulations involving the whole non-linear model. This study assesses the feasibility of the electromagnetic tugging of a semicooperative non-hostile target.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
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Institution:UNSPECIFIED
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ESA - Airbus
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Deposited On:26 Apr 2021 18:47

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