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  • LAUNCH VEHICLES AND SPACE VEHICLES  (1)
  • Space Communications, Spacecraft Communications, Command and Tracking  (1)
  • 1
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    Navigation for the new millennium: Autonomous navigation for Deep Space 1 (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The autonomous optical navigation system technology for the Deep Space 1 (DS1) mission is reported on. The DS1 navigation system will be the first to use autonomous navigation in deep space. The systems tasks are to: perform interplanetary cruise orbit determination using images of distant asteroids; control and maintain the orbit of the spacecraft with an ion propulsion system and conventional thrusters, and perform late knowledge updates of target position during close flybys in order to facilitate high quality data return from asteroid MaAuliffe and comet West-Kohoutek-Ikemura. To accomplish these tasks, the following functions are required: picture planning; image processing; dynamical modeling and integration; planetary ephemeris and star catalog handling; orbit determination; data filtering and estimation; maneuver estimation, and spacecraft ephemeris updating. These systems and functions are described and preliminary performance data are presented.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: ; 303-320
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Satellite orbit determination (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The determination of the Mars-centered ephemerides of the Viking Orbiters and positions of the Landers from two way Doppler and range data is described. An overview of mission satellite orbit determination functions and methods is given. Topics covered include: postmaneuver orbit convergence, local orbit knowledge accuracies, the effects of interplanetary media, use of constrained solutions, and solving through trim burns. Procedure and results relevant to the determination of the planet gravity field are included. Results relative to sensing Mars' gravity field during the extended mission are presented along with a discussion of the Phobos Flyby Experiment conducted during February 1977.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Viking Navigation; p 109-152
    Format: text
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    NASA TECHNICAL REPORTS
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