@article{oai:jaxa.repo.nii.ac.jp:00033272,
 author = {小林, 秀行 and 冨家, 文穂 and 川口, 則幸 and 山本, 善一 and 高橋, 今朝人 and 廣澤, 春任 and 平林, 久 and 村田, 泰宏 and Kobayashi, Hideyuki and Fuke, Fumio and Kawaguchi, Noriyuki and Yamamoto, Zen-ichi and Takahashi, Kesato and Hirosawa, Haruto and Hirabayashi, Hisashi and Murata, Yasuhiro},
 journal = {宇宙科学研究所報告},
 month = {Sep},
 note = {科学衛星「はるか」（打ち上げ前の名称MUSES-B）のための位相基準信号伝送システムについて，衛星搭載系を中心に述べている．位相基準信号の伝送（phase transfer）はスペースVLBI（超長基線干渉計）を成り立たせるために必要な基本技術で，位相安定度の高い標準周波数信号を地上局から衛星に電波により送るものである．「はるか」では，地上局から，周波数15.3GHzの電波を衛星に向けて送信し，衛星上では，それを位相同期受信機で受け，周波数50MHzの基準信号を生成している．基準信号は観測系機器に分配されるとともに，それから周波数14.2GHzのダウンリンク用搬送波が作られ，搬送波は観測データによってQPSK変調を施されて地上に向けて送出される．地上局では，往復ループの位相変動を測定する．開発した衛星搭載システムの位相安定度特性は，VLBIにおいて必要とされるコヒーレンス条件を十分満たすものであった．「はるか」打ち上げ後，位相基準信号伝送システムは目的とする機能を果たし，「はるか」によるスペースVLBI観測を可能にした．, The phase transfer to the space VLBI（Very Long Baseline Interferometry）satellite HALCA and the instrument system for it on board the spacecraft aredescribed. The phase transfer, supplying an extremely stable frequency-referencesignal to spacecraft by a radio wave from ground, is one of the key technologiesnecessary for space VLBI. The phase transfer for HALCA consists of such operations as:（1）a ground station transmits a 15.3 GHz up-link signal generated from a hydrogen maser frequency standard to the spacecraft,（2）a phase-lock receiver on the spacecraft receives the 15.3 GHz signal and generates the reference signal with a frequency of 50 MHz,（3）the reference signal is supplied to the radio astronomy instruments and the local signal generator,（4）the local signal generator generates a 14.2 GHz down-link carrier, together with local frequency signals for radio astronomy receivers,（5）the 14.2 GHz down-link carrier, which is QPSK modulated by radio astronomy signals, is transmitted toward ground, and（6）the down-link carrier is received and demodulated, and two-way loop phase is measured, at the ground station. The system on board the spacecraft has been confirmed, before the launch, to satisfy the coherence condition required from the VLBI correlation. The phase transfer has operated satisfactorily for the satellite HALCA in orbit and contributed to the success of the space VLBI observations by HALCA., 資料番号: SA0200045000},
 pages = {1--28},
 title = {科学衛星「はるか」における位相基準信号伝送のための衛星搭載システム},
 volume = {116},
 year = {2001}
}