On-line identification and attitude control for SCOLEThis paper documents on-line linear least-square identification and attitude control of SCOLE, a laboratory apparatus representing an offset-feed antenna attached to the Space Shuttle. Identification is done autonomously by starting a slew maneuver in pitch or roll with reaction jets and observing the time history data of associated Euler angles when the jets are quiescent. Linear least-square analysis is used to select the parameters that best fit the output of an Autoregressive (AR) model to the data. The control effectiveness of the jets is determined in a subsequent test, again using linear least squares. The parameters so derived are used to design switching lines for time-optimal attitude control. This report describes the identification and control algorithms and the experimental apparatus and procedures used. Also, experimental data are presented that reflect the performance of the identification algorithms and the attitude control system.
Document ID
19870063231
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Montgomery, R. C. (NASA Langley Research Center Hampton, VA, United States)
Shenhar, J. (NASA Langley Research Center Hampton, VA, United States)
Williams, J. P. (NASA Langley Research Center Hampton, VA, United States)