The Nanshan radio telescope (NSRT) is a fully steerable radio telescope with a diameter of 26 meters, located in Urumqi, Xinjiang, China. The NSRT currently operate in the frequency range from 1.4 GHz to 22.4 GHz。In order to reduce effect of gravity-induced structural deformations on antenna efficiency and pointing accuracy, the subreflector adjustment system has been used to adjust subreflector position in 6 degree-of-freedom to correct subreflector defocusing and reflectors misalignment. The Stewart platform is used as the adjustment mechanism to perform translation -50/+50 mm (along x, y, z axis) and rotation -5/+5 degree (with respect to x, y axis) with repeated positioning accuracies of 0.07 mm (translation) and 0.01 degree (rotation). The paper will mainly introduce an overview of the NSRT subreflector adjustment system, including Stewart platform and control system, performance testing, and position adjustment of subreflector.
KEYWORDS: Switching, Reflectors, Radio telescopes, Antennas, Kinematics, Control systems design, Optical instrument design, Light sources, Finite element methods, Lithium
Nanshan 26 m Radio Telescope (NSRT) constructed in Nanshan Urumqi, Xinjiang, China, it is a fully steerable radio telescope, the observing frequency up to 43GHz. The telescope was refurbishment in 2015 after 20 years operation. A rapid feed switching mechanism was designed and installed on antenna sub-reflector. The mechanism including a “hexapod” structure which used to adjustment the sub-reflector supporting legs deformation at difference elevation angles, and a turret used to changing the position of light source focus to meet the different feeds requirement. All the feeds distributed on the circle of Cassegrain focal plane. An overview of the mechanism design, FE (finite element) analysis and kinematics simulation will be show in this paper.
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.