Drag modulation provides a straightforward approach to aerocapture trajectory control. In this paper, two guidance algorithms are assessed for Venus aerocapture: a predictive-trigger and a numerical predictor–corrector. A hybrid root finder is developed for both single- and multistage jettison. Architecture performance is assessed using Monte Carlo methods. Two apoapsis altitude targets, 2000 and 10,000 km, are considered alongside two entry flight-path angles, 5.4 ° and 5.6 ° . The hybrid root finder improved targeting accuracy and robustness compared with a standard bisection technique. Each of the guidance algorithms performed better for shallower entry angles. The benefit of multi-event jettison architectures is analyzed in this study. A second jettison event is shown to significantly improve apoapsis targeting accuracy, whereas a third jettison event further improves this accuracy, but to a lesser degree, demonstrating multistage jettison’s potential to improve aerocapture robustness.


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    Title :

    Discrete-Event Drag-Modulated Guidance Performance for Venus Aerocapture


    Contributors:
    Roelke, E. (author) / Braun, R. D. (author)

    Published in:

    Publication date :

    2020-08-06


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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