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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., 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。

Free-space quantum cryptography is expected to be a first space application employing quantum technology in the near future because of the suitability for the long distance transmission of photons. European Space Agency (ESA) plans to demonstrate a quantum key distribution experiment onboard the ESA's Columbus module in the International Space Station (ISS) called Space-QUEST. The quantum key distribution employing entangled photons will be demonstrated using three optical ground stations in Europe. Therefore, there is a possibility for Japan to join it as one of the optical ground stations for the global quantum key distribution. NICT (National Institute of Information and Communication Technology) has started a feasibility study on the quantum cryptography for space communications. In this paper, the current status of research and development for space quantum cryptography communications in NICT is presented.