English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

This paper describes a ground verification method for a high-accuracy on-board antenna-drive control system which compensates the antenna's pointing error. A ground test system for this control system was investigated to predict the control performance in orbit. A laser beam was used instead of the RF beacon signal, and an RF converter which simulates the RF characteristics of the antenna system has been composed in order to realize the closed loop test system. The ground test system was constructed using a vacuum chamber to simulate the thermal vacuum environment. Gravity compensation was applied to the antenna pointing mechanism and 1.6×10-4G (G: acceleration of gravity) environment was obtained by adjusting the suspension point location. Control performance of the antenna-drive control system which is planned for the launch on ETS-VI spacecraft was evaluated by this ground test system.

Ground Verification Method of High-Accuracy On-Board Antenna-Drive Control System.