meetings - Space Flight Mechanics Committee

Feb 14, 2013 Kauai Salon 3
SESSION 27: SPACECRAFT GUIDANCE, NAVIGATION, AND CONTROL -- II
Chair: Dr. Marcus Holzinger, Georgia Institute of Technology
8:00 AAS Precision Landing at Mars Using Discrete-event Drag Modulation
13-438 Zachary Putnam, Georgia Institute of Technology; Robert Braun, Georgia Institute
of Technology
An entry, descent, and landing system concept for achieving Mars Science Laboratory class
accuracy for a Mars Exploration Rover class payload at Mars is presented. The concept uses
a single drag-area jettison event to control its trajectory during entry. A three-degree-offreedom
trajectory simulation is used in conjunction with Monte Carlo techniques to assess
the performance of the entry, descent, and landing system concept. Results indicate a
terminal accuracy competitive with pre-flight Mars Science Laboratory estimates and a
significant reduction in peak heat rate and integrated heat load relative to the Mars
Exploration Rover entry system.
8:20 AAS Decentralized Guidance of Swarms of Spacecraft Using a Model Predictive
13-439 Control Implementation of Sequential Convex Programming
Daniel Morgan, University of Illinois at Urbana-Champaign; Soon-Jo Chung,
University of Illinois at Urbana-Champaign; Fred Y. Hadaegh, NASA / Caltech JPL
This paper presents a decentralized, model predictive control algorithm for the
reconfiguration of swarms of spacecraft composed of hundreds to thousands of agents with
limited capabilities. In our prior work, sequential convex programming has been used to
determine collision-free, fuel-efficient trajectories for the reconfiguration of spacecraft
swarms. This paper uses a model predictive control implementation of the sequential
convex programming algorithm in real-time. By updating the optimal trajectories during the
reconfiguration, the model predictive control algorithm becomes decentralized and more
robust to errors in sensing and actuation.
8:40 AAS Spacecraft Maneuvering via Atmospheric Differential Drag Using an
13-440 Adaptive Lyapunov Controller
David Perez, Rensselaer Polytechnic Institute; Riccardo Bevilacqua, Rensselaer
Polytechnic Institute
An adaptive Lyapunov Controller originally proposed by the authors in previous work for a
rendezvous maneuver using differential drag is here generalized allowing for the tracking of
reference trajectories or dynamics. The control algorithm is tested using Systems Tool Kit
simulations for a Re-phase, a Fly-around, and a rendezvous maneuvers. The interest in
autonomous propellant-less maneuvering comes from the desire of reducing costs for
performing formation maneuvering. Successful autonomous propellant-less maneuvering of
LEO S/C can be achieved using Differential Drag.
9:00 AAS Model Diagnostics and Dynamic Emulation: Enhancing the Understanding
23 rd AAS / AIAA Space Flight Mechanics Meeting Page 97