The Caltech Submillimeter Observatory telescope (CSO) will be moved from Mauna Kea, Hawaii to Chajnantor Plateau, Chile in 2022, and renamed as Leighton Chajnantor Telescope (LCT). The altitude of the new site of LCT is 5050 m, and the average wind speed is about 10 m/s. However, the pointing accuracy of LCT will be improved to 1 arc-second (rms), and the rotating speed of LCT’s antenna will be improved to 2 degrees/sec, in order to achieve its new scientific aim of large survey in the sub-millimeter waveband. More precise pointing accuracy and faster rotating speed under higher wind speed makes the servo control of LCT very challenging, because both the steady-state and the transient performances of the servo control system are required to get improved under larger disturbance, while the mechanical structure of LCT is less rigid due to the adoption of lean and optimized design. To solve this problem, in this work, a state-space model of the LCT servo control system is constructed, and the Davenport wind disturbance model for LCT is also constructed for simulating wind disturbance. To improve the stability and controllability, a robust controller of the servo system is designed based on H∞ control theory with considering the disturbance of high wind speed. Simulation analysis verifies the capability of the designed controller for improving LCT’s pointing accuracy and its antenna’s rotating speed. This research is of good significance for the refurbishment of LCT and the achievement of its new scientific aim.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.