meetings - Space Flight Mechanics Committee

Feb 12, 2013 Kauai Salon 2
SESSION 14: SPACECRAFT GUIDANCE, NAVIGATION, AND CONTROL -- I
Chair: Dr. Yanping Guo, Applied Physics Laboratory
13:30 AAS The Deep Space Atomic Clock: Ushering in a New Paradigm for Radio
13-325 Navigation and Science
Todd Ely, NASA / Caltech JPL; Jill Seubert, NASA / Caltech JPL; John Prestage,
NASA / Caltech JPL; Robert Tjoelker, NASA / Caltech JPL
The Deep Space Atomic Clock (DSAC) project is developing a small, low-mass atomic
clock based on mercury-ion trap technology and plans to demonstrate it in space by 2015.
DSAC will provide an on-board spacecraft frequency reference that can be used to form
precision 1-Way radiometric tracking data. With an Allan Deviation (A.D.) at 1 day of
better than 2.E-14, DSAC will have a long term accuracy and stability that is equivalent to
the existing Deep Space Network. The benefits of this for deep space radio navigation and
science will be presented.
13:50 AAS Flight Testing of Trajectories Computed by G-FOLD: Fuel Optimal Large
13-326 Divert Guidance Algorithm for Planetary Landing
Behcet Acikmese, The University of Texas at Austin
This paper describes the first terrestrial flight testing of a planetary pinpoint landing
guidance algorithm called G- FOLD, Guidance algorithm for Fuel Optimal Large Diverts.
The algorithm will enable access to currently unreachable but scientifically valuable science
targets, such as for Mars sample return mission, and is a component for enabling delivery of
large payloads necessary for human class planetary missions.
14:10 AAS Deployment of Spacecraft Structures Using Shape Memory Alloys
13-327 Ryan Stanley, Virginia Polytechnic Institute and State University; Troy Henderson,
Virginia Polytechnic Institute and State University
In this paper, the deployment of various spacecraft structural elements using shape memory
alloys is analyzed. The considerable design challenge of unfolding a spacecraft’s structural
component from its stowed, launch configuration to its operational configuration in orbit is
approached from a unique perspective by utilizing the memory property of shape memory
alloys activated by the incident solar radiation in the space environment. This paper will
examine the deployment of structural booms, solar cell panels, solar sails and other
components by exploiting this phenomenon in conjunction with folding algorithms
developed from computational origami programs and inspired by biological organisms.
14:30 AAS Analytical Guidance for Spacecraft Relative Motion under Constant Thrust
13-471 Using Relative Orbit Elements
Riccardo Bevilacqua, Rensselaer Polytechnic Institute; Thomas Lovell, Air Force
Research Laboratory
23 rd AAS / AIAA Space Flight Mechanics Meeting Page 57