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  • Other Sources  (4)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (3)
  • Cybernetics, Artificial Intelligence and Robotics  (1)
  • 1
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    Attitude and articulation control for CRAF/Cassini (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The Comet Rendezvous/Asteroid Flyby (CRAF) and Cassini planetary missions provide exciting pointing and control challenges. The mission and science objectives, and an attitude and articulation control concept designed to meet these challenges, are described. CRAF/Cassini mission characteristics which drive pointing and control include: close range flybys of asteroids and icy satellites; Huygens probe guidance and communication; Saturn orbit insertion; comet rendezvous and orbit insertion; closed loop target tracking from a comet orbit perturbed by gas and dust pressure; fine spacecraft pointing for Titan radar mapping and Earth communications; requirements for autonomous failure detection; isolation; recovery; and 13.5 year lifetime. The philosophy and approach chosen to meet these challenges and the overall control architecture are addressed, including operational and autonomous safe modes. Critical functions are highlighted, such as charge coupled device imaging of stars and extended bodies which provide references for inertial and target referenced pointing respectively. Tradeoffs and rationale for the selection and location of sensors and actuators are reviewed.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: ESA, Spacecraft Guidance, Navigation and Control Systems; p 23-32
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Highly Autonomous Systems Workshop (1998)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: It is our aim by launching a series of workshops on the topic of highly autonomous systems to reach out to the larger community interested in technology development for remotely deployed systems, particularly those for exploration.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Type: American Association for Artificial Intelligence; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A Voyager attitude control perspective on fault tolerant systems (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In current spacecraft design, a trend can be observed to achieve greater fault tolerance through the application of on-board software dedicated to detecting and isolating failures. Whether fault tolerance through software can meet the desired objectives depends on very careful consideration and control of the system in which the software is imbedded. The considered investigation has the objective to provide some of the insight needed for the required analysis of the system. A description is given of the techniques which have been developed in this connection during the development of the Voyager spacecraft. The Voyager Galileo Attitude and Articulation Control Subsystem (AACS) fault tolerant design is discussed to emphasize basic lessons learned from this experience. The central driver of hardware redundancy implementation on Voyager was known as the 'single point failure criterion'.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 81-1812 , Guidance and Control Conference; Aug 19, 1981 - Aug 21, 1981; Albuquerque, NM
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Attitude and articulation control solutions for Project Galileo (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Design problems and the solutions adopted for them in the attitude and articulation control subsystem for the Galileo spacecraft are discussed as an illustration of the application of dual-spin control to an interplanetary spacecraft. Following a review of the baseline design of the Galileo system and mission, consideration is given to problems encountered in the areas of autonomous attitude determination, attitude control, spacecraft dynamics and software margins. Design issues raised by subsequent changes in spacecraft configuration are also indicated. It is pointed out that although difficulties associated with control system complexity in a dual-spin interplanetary spacecraft have been satisfactorily resolved for the Galileo mission, the future application of dual spin in interplanetary flight is in doubt.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AAS 80-019 , Annual Rocky Mountain Conference; Feb 17, 1980 - Feb 21, 1980; Keystone, CO
    Format: text
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    NASA TECHNICAL REPORTS
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