Authors: Hiroyuki Kawano Haruhiko Shimoji Shoji Yoshikawa Katsumasa Miyatake Kazumori Hama Shuji Nakamura
Publish Date: 2008/04/29
Volume: 15, Issue: 2, Pages: 118-124
Abstract
Alignment error of an image sensor relative to the optical axis of a star sensor head and alignment errors between four heads were calculated from pictures taken in an orbital experiment When comparing the image sensor alignment parameters in the orbital test and a ground test both values matched well By determining the relative relationship of the four heads using four pictures taken at the same moment in orbit and uploading the parameters to the star sensor system in orbit the estimated attitude error was improved from 029 to 017° though the accuracy was limited by the ±02° determination accuracy of the satellite itself We estimated the attitude determination accuracy from separation angles between boresights of the four heads calculated from pattern matching between downloaded pictures and a star catalogue The estimated accuracy in terms of potential optical performance was 060 arcmin at 3σ which is sufficient to satisfy the specification of 1 arcmin
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