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近年、指向安定度劣化の主要因として検討が盛んな機械的振動擾乱について、OICETS (Optical Inter-orbit Communications Engineering Test Satellite:きらり)に搭載したMVE (Micro Vibration Equipment)の軌道上加速度データ出力をもとに、軌道上で実際に発生した振動擾乱についての評価を行う。軌道上データから構造伝達特性を評価し、この結果と地上試験データから得られる構造伝達特性との比較を行うことで、地上試験の結果が軌道上でどの程度再現しているかを確認し、地上試験の有効性について、考察を行う。, The microvibration generated by some instruments on orbit is considered as a key factor of pointing stability deterioration. Therefore it is important that the influence of the microvibration is estimated before the launch. In this paper the results of the ground tests by using of OICETS (Optical Inter-orbit Communications Engineering Test Satellite: KIRARI) MTM (Mechanical Test Model) and the on orbit measured result by the accelerometer (MVE: Micro Vibration Equipment) installed in OICETS are described. By using these results and an assumption, the transfer characteristics from main disturbance sources to MVE installed in OICETS are calculated. We compare these structural transfer characteristics and confirm the reproducibility of the ground test on orbit and the effectiveness of the ground test., 資料番号: AA0063481054

Japan Aerospace Exploration Agency (JAXA) had built and launched the Optical Inter-orbit Communications Engineering Test Satellite (OICETS: KIRARI) with the optical terminal called the Laser Utilization Communications Equipment (LUCE) and performed optical communication tests with ESA's Advanced Relay and TEchnology MISsion (ARTEMIS) satellite around the end of 2005. OICETS' communications technology is mostly compatible to the optical ground station which was built by German Aerospace Center (DLR) for communications tests in the ongoing projects CAPANINA (Communications from Aerial Platform Networks) and TerraSAR (Synthetic Aperture Radar)-LCT-IOV. Therefore, DLR and JAXA would like to execute a downlink experiment from OICETS to DLR's optical ground station. Purpose of this experiment was to demonstrate the feasibility of high-speed optical data downlinks from LEO (Low Earth Orbit) (e.g. earth-observation) satellites to simple, inexpensive optical ground terminals for future use. The cooperative project was named as 'the Kirari Optical Downlink to Oberpfaffenhofen (KIODO)'. DLR and JAXA entered into Joint Research Agreement on the date of the last signature, April 28, 2006. The Joint Research Agreement remains effective until December 31, 2006. The first meeting was held on February 14, 2006 at DLR Oberpfaffenhofen, Wessling, Germany. The second meeting was on April 26, 2006 at JAXA Tsukuba Space Center, Japan. In those meetings, the period of experiments was determined from June 7-30, 2006. The KIODO trials were successfully conducted during that period, and the third meeting was held on December 5, and 6, 2006 at DLR Oberpfaffenhofen to discuss the results. This document describes the objectives of KIODO project, introductions of the facilities, experiment scenarios, and interface controls through the section two to the section five. In the section six, the results of feasibility assessments are summarized. The section seven shows the schedule. The experimental conditions and measured data in each trial are given in the section eight. The results are summarized in the section nine and the detailed discussions on some issues are described in the section 10., 資料番号: AA0063468000, レポート番号: JAXA-RM-07-003E