| Project/Area Number |
11440135
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体地球物理学
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| Research Institution | National Astronomical Observatory |
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Principal Investigator |
KAWANO Nobuyuki Nat, Astron. Obs, Earth Rotation Division Professor, 地球回転研究系, 教授 (10186116)
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| Co-Investigator(Kenkyū-buntansha) |
NAMIKI Noriyuki Kyusyu University, Assistant, 理学部, 助手 (50274428)
KATOU Takaji National Space Development Agency of Japan, Associated Prof., 宇宙科学研究所, 助教授 (10249930)
HANADA Hideo Nat. Astron. Obs., Earth Rotation Division, Associated Prof., 地球回転研究系, 助教授 (60132677)
KOYAMA Yasuhiro Communications Research Laboratory, Senior Researcher, 鹿児宇宙通信センター, 助教授 (30359054)
YASUDA Shigeru Kagoshima University, Assistant, 工学部, 助手 (30253909)
林 理三雄 鹿児島大学, 工学部, 教授 (70244259)
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| Project Period (FY) |
1999 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Moon / Lunar gravity field / SELENE / 4-way Doppler / Orbit Determination / VLBI |
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| Research Abstract |
A new approach to investigation of lunar interior was conducted by this project, and the results will be applied to the mission of Japanese lunar exploration project SELENE. The main results are,
1) The new VLBI technique by receiving several frequency signals with narrow bands was developed in stead of conventional wide band VLBI technique. It will provide us the accurate lunar gravity field at the edge of the Moon and the structure of lunar crust in SELENE project.
2) A 4-way Doppler frequency method by relaying a stable signal between lunar orbiter through the relay satellite was investigated to obtain the first gravity field map in the lunar far side. This method is applied to one of the SELENE missions.
3) It was found that the Doppler caused by satellite spin is one of the serious error sources in Doppler measurements.
4) The new orbit determination software by using both Doppler and VLBI data was developed under the cooperation with NASA/GSFC.
5) Lunar free-air gravity anomaly and the distribution of Moho around craters were derived by inversion of Doppler. These new observation and analysis methods contribute lunar and planetary explorations in the near future.
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