An accurate measurements of lunar gravity fields by the differential VLBI technique

差分VLBI技术精确测量月球重力场

• 批准号: 11440135
• 负责人: KAWANO Nobuyuki
• 金额: $ 2.69万
• 依托单位: National Astronomical Observatory
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440135/
• 关键词: Moon; Lunar gravity field; SELENE; 4-way Doppler; Orbit Determination; VLBI

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.

该项目为月球内部研究开辟了一条新途径，其研究成果将应用于日本月球探测计划SELENE的使命。主要研究结果如下：1）提出了一种新的窄频带多频接收VLBI技术，以取代传统的宽带VLBI技术。2）研究了一种通过中继卫星在月球轨道器之间中继稳定信号的四路多普勒频率方法，获得了第一幅月球远月面重力场图。研究结果表明，卫星自旋引起的多普勒效应是多普勒测量的主要误差源之一;与NASA/GSFC合作开发了基于多普勒和VLBI数据的月球定轨软件;通过多普勒反演得到了月球自由空间重力异常和环形山周围莫霍面分布。这些新的观测和分析方法有助于在不久的将来进行月球和行星探测。

项目成果

Hanada Hideo, et al.: "Observations of Lunar Physical Librations and Gravitational Fields in Japanese Lunar Missions in the Near Future"Proc. IAU Colloquim 178. 208. 627-630 (1999)

Hanada Hideo 等人：“近期日本探月任务中月球物理天平动和引力场的观测”Proc。

Iwata Tkahiro, et al.: "PROPERTIES OF THE RELEASE MECHANISM OF SELENE RELAY SATELLITE AND THEIR INFLUENCES FOR THE LUNAR GRAVITY OBSERVATION"Proceedings of 23rd ISTS Symposium. 2002. k-13 (2002)

Iwata Tkahiro等：“SELENE中继卫星释放机制的特性及其对月球重力观测的影响”第23届ISTS研讨会论文集。

Hanada Hideo, et al.: "Possibility of Observations of Rotational Fluctuations and Tidal Deformations of Planets b the Inverse VLBI Method"Journal of the Geodetic Society of Japan. 47,1. 521-527 (2001)

Hanada Hideo 等：“通过反 VLBI 方法观测行星自转波动和潮汐变形的可能性”日本大地测量学会杂志。

鶴田誠逸, 宮崎智行, 花田英夫, 堀江雄二, 奥高洋, 河野宣之, 他: "SELENE計画におけるVLBI用月面電波源の熱制御と低熱伝導同軸ケーブルの開発"国立天文台報. 4, 4. 171-180 (2000)

Seiichi Tsuruta、Tomoyuki Miyazaki、Hideo Hanada、Yuji Horie、Hiroshi Okutaka、Nobuyuki Kono 等人：“SELENE 项目中 VLBI 月球射电源的热控制和低导热率同轴电缆的开发”国家天文台日本公报。4, 4. 171 -180 (2000)

鶴田誠逸、宮崎智行、花田英夫、堀江雄二、奥高洋、河野宣之、他: "SELENE計画におけるVLBI用月面電波源の熱制御と低熱伝導同軸ケーブルの開発"国立天文台報. (印刷中). (2000)

Seiichi Tsuruta、Tomoyuki Miyazaki、Hideo Hanada、Yuji Horie、Hiroshi Okutaka、Nobuyuki Kono 等人：“SELENE 项目中 VLBI 月球射电源的热控制和低导热率同轴电缆的开发”国家天文台日本公报（印刷中）（2000 年）。