meetings - Space Flight Mechanics Committee

Feb 13, 2013 Kauai Salon 2
SESSION 18: ATTITUDE DETERMINATION, DYNAMICS, AND CONTROL -- III
Chair: Dr. Don Mackison, University of Colorado
8:00 AAS Greedy Tasking for Spacecraft Attitude Resource Sharing
13-361 Shawn Johnson, University of Florida; Norman Fitz-Coy, University of Florida
This paper investigates greedy strategies for spacecraft attitude resource sharing in
fractionated spacecraft architectures. One spacecraft has the capability to measure its
inertial attitude and its relative attitude with respect the other spacecraft. All other
spacecraft in the network require inertial attitude knowledge, but lack sensing feedback.
This sensor tasking is shown to lack separation in estimation and control, which motivates
the application of greedy tasking. Shannon entropy and covariance matrix norms are used as
metrics for greedy tasking and are compared with a baseline Round-robin tasking.
Simulations demonstrate the method’s improvement in network-level attitude pointing
accuracy
8:20 AAS q-Method Extended Kalman Filter
13-362 Renato Zanetti, Draper Laboratory; Thomas Ainscough, Draper Laboratory; John
Christian, NASA Johnson Space Center; Pol Spanos, Rice University
A new algorithm is proposed that smoothly integrates non-linear estimation of the attitude
quaternion using Davenport’s q-method and estimation of non-attitude states through an
extended Kalman filter. The new method is compared to a similar existing algorithm
showing its similarities and differences. The validity of the proposed approach is confirmed
through numerical simulations.
8:40 AAS Attitude Reconstruction Analysis of the Reentry Breakup Recorder
13-363 Russell Patera, The Aerospace Corporation
The REBR (reentry breakup recorder) is a small self contained space vehicle whose purpose
is to obtained data to help define a space vehicle’s reentry environment. The first REBR
mission flew on JAXA’s HTV2 space vehicle and recorded data during atmosphere reentry
on March 30, 2011. REBR used the Iridum network to transmit data during its descent
through the lower atmosphere. This paper focuses on the methods used to reconstruct
REBR’s attitude through the highly dynamic breakup environment using REBR’s low
sample rate data.
9:00 AAS Online Attitude Determination of a Passively Magnetically Stabilized
13-364 Spacecraft
Roland Burton, Stanford University; Stephen Rock, Stanford University
An online attitude determination filter is introduced that is capable of estimating the attitude
of a passively magnetically stabilized spacecraft to within about five degrees accuracy
23 rd AAS / AIAA Space Flight Mechanics Meeting Page 69