@inproceedings{1ff417c974e844aebf5a5ce13844b3bb,
title = "Observer-based body-frame hovering control over a tumbling asteroid",
abstract = "Observer-based hovering control over a tumbling asteroid in the body-fixed frame is studied. An extended Kalman filter (EKF) is used to process range measurements from a small collection of ground stations, yielding estimates of the spacecraft state vector and the gravitational parameters of the asteroid assuming a second degree and order gravity field model. The estimated states are used in the optimal feedback control algorithm which consists of two alternatives: time-varying LQR or the Lyapunov-Floquet transformation (LFT) and time-invariant LQR. The closed-loop response of the system and the control effort required are investigated and compared for both control strategies.",
author = "Morad Nazari and Robert Wauson and Thomas Critz and Butcher, \{Eric A.\} and Scheeres, \{Daniel J.\}",
year = "2014",
language = "English (US)",
isbn = "9780877036050",
series = "Advances in the Astronautical Sciences",
publisher = "Univelt Inc.",
pages = "1737--1755",
booktitle = "Astrodynamics 2013 - Advances in the Astronautical Sciences",
note = "2013 AAS/AIAA Astrodynamics Specialist Conference, Astrodynamics 2013 ; Conference date: 11-08-2013 Through 15-08-2013",
}