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Hubble Space Telescope Angular Velocity Estimation During the Robotic Servicing MissionDuring the Hubble Robotic Servicing Mission, the Hubble Space Telescope (HST) attitude and rates are necessary to achieve the capture of HST by the Hubble Robotic Vehicle (HRV). The attitude and rates must be determined without the HST gyros or HST attitude estimates. The HRV will be equipped with vision-based sensors, capable of estimating the relative attitude between HST and HRV. The HST attitude is derived from the measured relative attitude and the HRV computed inertial attitude. However, the relative rate between HST and HRV cannot be measured directly. Therefore, the HST rate with respect to inertial space is not known. Two approaches are developed to estimate the HST rates. Both methods utilize the measured relative attitude and the HRV inertial attitude and rates. First, a nonlinear estimator is developed. The nonlinear approach estimates the HST rate through an estimation of the inertial angular momentum. Second, a linearized approach is developed. The linearized approach is based on more traditional Extended Kalman filter techniques. Simulation test results for both methods are given.
Document ID
20050157089
Document Type
Conference Paper
Authors
Thienel, Julie K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Queen, Steven Z. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
VanEepoel, John M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sanner, Robert M. (Maryland Univ. College Park, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Astrodynamics
Meeting Information
AIAA GNC Conferences(San Francisco, CA)
Distribution Limits
Public
Copyright
Other