A performance evaluation of the Hybrid Predictor corrector Aerocapture Scheme (HYPAS) guidance algorithm for aerocapture at Neptune is presented in this paper for a Mission to Neptune and the Neptune moon Triton'. This mission has several challenges not experienced in previous aerocapture guidance assessments. These challengers are a very high Neptune arrival speed, atmospheric exit into a high energy orbit about Neptune, and a very high ballistic coefficient that results in a low altitude acceleration capability when combined with the aeroshell LD. The evaluation includes a definition of the entry corridor, a comparison to the theoretical optimum performance, and guidance responses to variations in atmospheric density, aerodynamic coefficients and flight path angle for various vehicle configurations (ballistic numbers). The benefits of utilizing angle-of-attack modulation in addition to bank angle modulation to improve flight performance is also discussed. The results show that despite large sensitivities in apoapsis targeting, the algorithm performs within the allocated AV budget for the Neptune mission bank angle only modulation. The addition of angle-of-attack modulation with as little as 5 degrees of amplitude significantly improves the scatter in final orbit apoapsis. Although the angle-of-attack modulation complicates the vehicle design, the performance enhancement reduces aerocapture risk and reduces the propellant consumption needed to reach the high energy target orbit for a conventional propulsion system.


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    Titel :

    Aerocapture Guidance Performance for the Neptune Orbiter


    Beteiligte:

    Kongress:

    AIAA Atmospheric Flight Mechanics Conference ; 2004 ; Providence, RI, United States


    Erscheinungsdatum :

    2004-01-01


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Aerocapture Guidance Performance for the Neptune Orbiter

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    Small Neptune Orbiter Using Aerocapture

    Lemmerman, L. A. / Wercinski, P. F. / University of New Mexico; School of Engineering; Institute for Space and Nuclear Power Studies | British Library Conference Proceedings | 1997


    AIAA-2004-4954 Aerocapture Guidance Performance for the Neptune Orbiter

    Westhelle, C. / Graves, C. / Masciarelli, J. | British Library Conference Proceedings | 2004



    Configuration, Aerodynamics, and Stability Analysis for a Neptune Aerocapture Orbiter

    Edquist, Karl / Prabhu, Ramadas / Hoffman, David et al. | AIAA | 2004