Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
National Institute of Information and Communications Technology (NICT)
National Institute of Information and Communications Technology (NICT)
National Institute of Information and Communications Technology (NICT)
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙科学シンポジウム講演集録
雑誌名(英)
Proceedings of the Space Science Symposium
巻
9
発行年
2009
会議概要（会議名, 開催地, 会期, 主催者等）
第9回宇宙科学シンポジウム(2009年1月6日-7日, 宇宙航空研究開発機構宇宙科学研究本部)
抄録（英）
Precise orbit determination (POD) is a key factor to enable observations using the phase-referencing technique with Astro-G. A POD accuracy of 30 cm is required for X-band phase referencing observations, accuracy of 6 cm for K-band observations, and accuracy of 3 cm for Q-band observations. In HALCA (VSOP-1), typical orbit accuracy was only 1 - 30 m by using Ku-band doppler observables. In order to achieve more than 10-times improvement, Astro-G satellite will be equipped with a GPS receiver and a SLR (Satellite Laser Ranging) retroreflector array. Though the use of high precision accelerometer had also been discussed, we concluded that it could not be used because it must be saturated during fast switching observations. Local-ties between phase-centers of four GPS antennas, reference point of the SLR retroreflector, and satellite's center of mass position, which will be changed as fuel consumptions, should be maintained accurately.
Development status of orbit determination system for Astro-G
