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    Estimating trajectory correction requirements for multiple outer planet missions. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: General approach to the problem of estimating trajectory correction requirements for multiple outer planet flyby missions when the navigation system uses onboard optical measurements made during approach to each target planet to complement the ground-based radio measurements. The accuracy and reliability of the onboard measurement system plays a critical role in sizing the trajectory correction capability required. An illustration of the combined use of radio and optical measurements is provided for the particular case of a Jupiter-Uranus-Neptune mission. Use of the statistical technique developed for computing the trajectory correction margin required to account for uncertainties in subsystem performance, permits trajectory correction savings of 100 to 20 m/sec over 'worst case' designs. This represents weight savings of about 50% of the science payload. For the example case trajectory correction requirements are estimated for two candidate optical systems and the radio alone case. The use of onboard measurements allows a trajectory correction savings of approximately 140 m/sec.
    Keywords: SPACE SCIENCES
    Type: Journal of Spacecraft and Rockets; 9; Dec. 197
    Format: text
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  • 2
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    Estimating trajectory correction requirements for the Outer Planets Grand Tour missions. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The estimation of trajectory correction requirements for the Outer Planets Grand Tour (OPGT) missions poses a unique and many-faceted problem for the systems analyst. In this paper the navigation concept for the OPGT is developed and illustrated. The limiting accuracies and performance of the combined radio/onboard optical system are examined. The combined orbit determination system is characterized by its accuracy and by its system risks. Such considerations are included with the statistical combination of maneuver estimates to produce preliminary delta V estimates for the planned OPGT missions.
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 72-54 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 17, 1972 - Jan 19, 1972; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
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