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 X -band antenna.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Enhancement of Microjitter Attenuation Capability for a Stepper-Actuated Two-Axis Gimbal-Type Antenna by Using a Spring-Blade Isolator


    Contributors:

    Published in:

    Publication date :

    2017-02-13




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown