Enhancement of Microjitter Attenuation Capability for a Stepper-Actuated Two-Axis Gimbal-Type Antenna by Using a Spring-Blade Isolator
Publication: Journal of Aerospace Engineering
Volume 30, Issue 4
Abstract
A two-axis gimbal-type X-band antenna used to transmit real-time image data from a satellite to a ground station is a potential source of microjitter, which can degrade image quality from high-resolution observation satellites. Activation of discontinuous stepper motors during pointing of the antenna mechanism in the azimuth and elevation directions is one of the primary sources of microjitter disturbances. It is desirable to enhance microjitter attenuation capability by isolating disturbances from stepper motor activation with a reliable technical solution not requiring major design modification of the antenna. In this study, the application of a low-torsional-stiffness spring-blade isolator on the output shaft of the stepper actuator is proposed. The spring-blade isolators were designed based on the derived torque budgets of the antenna, ensuring structural safety of the blades. The design of the spring-blade isolators was verified through structural analysis and a torque measurement test. In addition, the effectiveness of the isolators was demonstrated in a microjitter measurement test of the -band antenna.
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Acknowledgments
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2015R1A2A2A01003672).
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Published In
Journal of Aerospace Engineering
Volume 30 • Issue 4 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 4, 2016
Accepted: Oct 6, 2016
Published ahead of print: Feb 12, 2017
Published online: Feb 13, 2017
Published in print: Jul 1, 2017
Discussion open until: Jul 13, 2017
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