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  • 1
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    Minimum-fuel rocket trajectories involving intermediate-thrust arcs (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The optimal trajectories in the neighborhood of an optimal intermediate-thrust arc are investigated for the minimum-fuel orbit rendezvous problem with fixed specific impulse. Since such an arc is singular, the thrust acceleration magnitude being the singular control component, a second-variation analysis leads to the identification of a field of neighboring, singular arcs in a state space of dimension four rather than six, provided that a suitable Jacobi condition is met. A given neighboring initial six-dimensional state vector does not generally lie on a neighboring singular arc, and junction onto the appropriate singular arc must be accomplished by a short period of strong variations in the acceleration. The neighboring singular arc meets the final condition in 4 dimensions, rather than 6 dimensions, and rendezvous must be completed by another, terminal short period of strong variations in the acceleration. Implications for midcourse guidance near a singular arc are discussed.
    Keywords: ASTRODYNAMICS
    Type: Journal of Optimization Theory and Applications; 17; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Navigation accuracy analysis for the Mariner-Jupiter-Saturn 1977 mission (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The results of the latest navigation capability study for the Mariner-Jupiter-Saturn 1977 mission are presented and analyzed. Predicted planet-relative and satellite-relative accuracies are given for radio only and radio plus optical approach navigation on three representative trajectories. In addition, planet-relative accuracies are given for cruise navigation on one of the trajectories. The dynamical and measurement error models used in the study are discussed, and the basic MJS77 navigation strategy is described. The navigation capability is evaluated in the light of the mission's objectives; and the variation in capability among the three trajectories is examined with regard to the effects of the major error sources and the trajectory dependent encounter geometries.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 76-833 , Astrodynamics Conference; Aug 18, 1976 - Aug 20, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Communications satellite systems operations with the space station, volume 2 (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A financial model was developed which described quantitatively the economics of the space segment of communication satellite systems. The model describes the economics of the space system throughout the lifetime of the satellite. The expected state-of-the-art status of communications satellite systems and operations beginning service in 1995 were assessed and described. New or enhanced space-based activities and associated satellite system designs that have the potential to achieve future communications satellite operations in geostationary orbit with improved economic performance were postulated and defined. Three scenarios using combinations of space-based activities were analyzed: a spin stabilized satellite, a three axis satellite, and assembly at the Space Station and GEO servicing. Functional and technical requirements placed on the Space Station by the scenarios were detailed. Requirements on the satellite were also listed.
    Keywords: SYSTEMS ANALYSIS
    Type: NASA-CR-179527 , NAS 1.26:179527
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Communications satellite systems operations with the space station. Volume 1: Executive summary (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The benefits of new space-based activities are quantified and the impacts on the satellite design and the space station are assessed.
    Keywords: SYSTEMS ANALYSIS
    Type: NASA-CR-179526 , NAS 1.26:179526
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Mariner/Jupiter/Saturn navigation in the presence of massive planetary satellites (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Orbit determination accuracies attainable during a Mariner/Jupiter/Saturn encounter have been established by means of covariance analyses. Advanced earth-based multistation radiometric data, optical data consisting of star/satellite pictures provided by a narrow-angle TV camera on board the spacecraft, and batch sequential filtering methods were employed. An evaluation of sequential filter sensitivities to errors in modeling small nongravitational spacecraft accelerations is presented. Selected covariances developed in the orbit determination analysis are used in an investigation of the trajectory correction costs associated with a close Ganymede encounter. The 99 percentile Delta V contours in the Ganymede aiming plane are obtained for satellite encounters before or after Jupiter closed approach, and the sources of the dominant contributions to the Delta V costs are identified.
    Keywords: NAVIGATION
    Type: AAS PAPER 73-247 , Astrodynamics Conference; Jul 16, 1973 - Jul 18, 1973; Vail, CO; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Petrology of anorthosites from the Descartes region of the moon - Apollo 16 (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Implications of subduction rehydration for earth's deep water cycle (2006)
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    Publication Date: 2023-11-08
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
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