日置幸介,松本晃治、 重力計測による月探査
国立天文台ニュース、68, 7-9, 1998.
リストの下にAdv. Space Res.の２論文 Heki et al.(1999)と Matsumoto et al. (1999) がありますが、それの解説版です。日本の月探査周回衛星（SELENE)計画では初めて月の重力 計測に相対VLBIによる三次元的な重力加速度の計測(VRAD)とリレー衛星を用いた月の裏側の重力の直 接計測(RSAT)が行われます。それらに関してGEODYNIIというソフトウェアを用いて月重力場の ストークス係数の推定精度を共分散解析で評価したもの。従来の方法ではセレノイド高の推定誤 差が月の裏側で大きいのがRSAT観測によって表側と同程度に下がるのが劇的です。 Full text
Abstract of Heki, K., K. Matsumoto and R. Floberghagen, Three-dimensional tracking of a lunar satellite with differential very-long-baseline-interferometry, Adv. Space Res., 23, 1821-1824, 1999.
Lunar gravimetry mission in the Japanese lunar exploration project SELENE (Selenological and Engineering Explorer) is characterized by inter-satellite tracking by means of a relay satellite in a high eccentric orbit, combined with differential Very-Long-Baseline-Interferometry (DVLBI) and conventional 2-way Doppler tracking. DVLBI provides information on the satellite position and velocity complementary to conventional range and range rate measurement, and allows us to measure lunar gravitational accelerations in all the three components. In this article, DVLBI and 2-way Doppler numerical simulation results are compared to those obtained from 2-way Doppler observations only, so that we can evaluate the contribution of DVLBI to the SELENE lunar gravimetry mission.
日置幸介 (email: heki@ep.sci.hokudai.ac.jp)