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1.
  • Arridge, Christopher S., et al. (författare)
  • Uranus Pathfinder : exploring the origins and evolution of Ice Giant planets
  • 2012
  • Ingår i: Experimental astronomy. - : Springer Science and Business Media LLC. - 0922-6435 .- 1572-9508. ; 33:2-3, s. 753-791
  • Tidskriftsartikel (refereegranskat)abstract
    • The "Ice Giants" Uranus and Neptune are a different class of planet compared to Jupiter and Saturn. Studying these objects is important for furthering our understanding of the formation and evolution of the planets, and unravelling the fundamental physical and chemical processes in the Solar System. The importance of filling these gaps in our knowledge of the Solar System is particularly acute when trying to apply our understanding to the numerous planetary systems that have been discovered around other stars. The Uranus Pathfinder (UP) mission thus represents the quintessential aspects of the objectives of the European planetary community as expressed in ESA's Cosmic Vision 2015-2025. UP was proposed to the European Space Agency's M3 call for medium-class missions in 2010 and proposed to be the first orbiter of an Ice Giant planet. As the most accessible Ice Giant within the M-class mission envelope Uranus was identified as the mission target. Although not selected for this call the UP mission concept provides a baseline framework for the exploration of Uranus with existing low-cost platforms and underlines the need to develop power sources suitable for the outer Solar System. The UP science case is based around exploring the origins, evolution, and processes at work in Ice Giant planetary systems. Three broad themes were identified: (1) Uranus as an Ice Giant, (2) An Ice Giant planetary system, and (3) An asymmetric magnetosphere. Due to the long interplanetary transfer from Earth to Uranus a significant cruise-phase science theme was also developed. The UP mission concept calls for the use of a Mars Express/Rosetta-type platform to launch on a Soyuz-Fregat in 2021 and entering into an eccentric polar orbit around Uranus in the 2036-2037 timeframe. The science payload has a strong heritage in Europe and beyond and requires no significant technology developments.
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2.
  • Roussos, G. P., et al. (författare)
  • 3D navigation and collision avoidance for a non-holonomic vehicle
  • 2008
  • Ingår i: Proceedings of the American Control Conference. ; , s. 3512-3517
  • Konferensbidrag (refereegranskat)abstract
    • This paper expands the methodology of Navigation Functions for the control of a spherical aircraft-like 3-dimensional nonholonomic vehicle. A Dipolar Navigation Function is used to generate a feasible, non-holonomic trajectory for the vehicle that leads from an arbitrary position to the target, in combination with a discontinuous feedback control law that steers the vehicle. The motion model used incorporates the nonholonomic constraints imposed on an aircraft, preventing any movement along the lateral or perpendicular axis, as well as preventing high yaw rotation rates. The control strategy provides guaranteed collision avoidance and convergence, and is supported by non-trivial simulation results.
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