Mission extension using sensitive trajectories and autonomous control
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Mission Extension Using Sensitive Trajectories and Autonomous Control. Edward Belbruno Princeton University and Innovative Orbital Design, Inc. AISRP PI MEETING 2005 April 3-6, NASA Ames.

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Mission Extension Using Sensitive Trajectories and Autonomous Control

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Mission Extension Using Sensitive Trajectories and Autonomous Control

Edward Belbruno

Princeton University and Innovative Orbital Design, Inc.

AISRP PI MEETING 2005

April 3-6, NASA Ames


Goal- Enable spacecraft to linger about a planet for extended time spans in a cost effective manner, and autonomously

  • Data collection is maximized for a given mission

  • Accomplish goal by using new sensitive/chaotic trajectories

  • Dynamic sensitivity saves fuel -> do more with less

  • Theory is weak stability boundary (WSB) theory developed by EB, 87-90

  • Idea: Transition region about a planet, eg Moon, between capture and escape –>chaotic weak capture

  • Can achieve ballistic lunar capture transfers(~surfercatchingwave)


Operational Demonstrations

  • Used in 1991 to salvage Japan’s Hiten and bring to Moon

    -> First application of chaos to space travel

    -> New 90 day ballistic capture transfer

  • Used in 2004 to get ESA’s SMART-1 captured into lunar orbit

  • Ideas played a key role in 1998 salvage of Hughes HGS-1 using Moon


Approach

  • Two key applications:

    a. Motion about planet in WSB region

    b. Newly discovered Quasi-stationary motion

  • Focus on a. using Moon

  • WSB transfer to Moon -> ballistic capture in WSB region

  • Can maintain weak capture for tiny DeltaV

  • Demonstrated in February’s work, DeltaV is very small

    ~ 20 m/s for 3-4 months

  • Smaller the DeltaV, more unstable/complicated the motion

    Idea- Reduce DeltaV, require more frequent control

  • Optimize -> will yield control algorithm that’s autonomous


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