Publication:
Waypoint Following Dynamics of a Quaternion Error Feedback Attitude Control System

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Authors
Karpenko, Mark
Halverson, Julie K.
Besser, Rebecca
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Date of Issue
2020-09
Date
2020-09
Publisher
ArXiv
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Abstract
Closed-loop attitude steering can be used to implement a non-standard attitude maneuver by using a conventional attitude control system to track a non-standard attitude profile. The idea has been employed to perform zero-propellant maneuvers on the International Space Station and minimum time maneuvers on NASA’s TRACE space telescope. A challenge for operational implementation of the idea is the finite capacity of a space vehicle’s command storage buffer. One approach to mitigate the problem is to downsample-and-hold the attitude commands as a set of waypoints for the attitude control system to follow. In this paper, we explore the waypoint following dynamics of a quaternion error feedback control law for downsample-and-hold. It is shown that downsample-and-hold induces a ripple between downsamples that causes the satellite angular rate to significantly overshoot the desired limit. Analysis in the z-domain is carried out in order to understand the phenomenon. An interpolating Chebyshev-type filter is proposed that allows attitude commands to be encoded in terms of a set of filter coefficients. Using the interpolating filter, commands can be issued at the ACS rate but with significantly reduced memory requirements. The attitude control system of NASA’s Lunar Reconnaissance Orbiter is used as an example to illustrate the behavior of a practical attitude control system.
Type
Preprint
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Department
Mechanical and Aerospace Engineering (MAE)
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Format
25 p.
Citation
Karpenko, Mark, Julie K. Halverson, and Rebecca Besser. "Waypoint Following Dynamics of a Quaternion Error Feedback Attitude Control System."
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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