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http://dx.doi.org/10.5515/KJKIEES.2014.25.5.532

Gyrocompass Correction and Pointing Accuracy Improvement of the Ship-Borne Mobile Down Range Antenna for Launcher Telemetry  

Lee, Sun-Ik (Korea Aerospace Research Institute)
Yeom, Kyung-Whan (Department of Radio Science & Engineering, Chungnam National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.25, no.5, 2014 , pp. 532-541 More about this Journal
Abstract
The ship-borne mobile down range telemetry antenna system having 4.6 m reflector antenna and 3-axis mounting structure at S-band requires the precise pointing accuracy at sea for the launch mission. Using the LEO satellites tracking, a method to determine and verify the antenna pointing and tracking performance, and to find the pointing bias which dominantly contributes to the pointing inaccuracy, is presented. Based upon the tests conducted on the Jeju sea and Pacific sea, the pointing bias is determined and its origin is also identified as the drift of the heading angle of the gyrocompass. The applied systematic correction taking into account the pointing bias, and the achieved improvement of the pointing accuracy are shown. Thanks to the correction, it is presented that this antenna tracked the launcher(KSLV-I) stably within the required pointing accuracy in the following KSLV-I third launch.
Keywords
Launcher Telemetry; Mobile Telemetry Antenna; Pointing Accuracy; Gyrocompass Correction; KSLV-I;
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