STUDY OF ASTROMETRY AND GEODYNAMICS BY MEANS OF INTERNATIONAL VLBI OBSERVATIONS
利用国际 VLBI 观测研究天文学和地球动力学
基本信息
- 批准号:03452016
- 负责人:
- 金额:$ 4.22万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1991
- 资助国家:日本
- 起止时间:1991 至 1992
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
1. Results obtained by VLBI observations(1) Detection of rapid variations of the earth's rotationThe International Earth Rotation Service (IERS) and the International GPS Geodynamics Service (IGS) jointly organized the international observational campaign to investigate feasibility of GPS in detecting rapid variations in the earth's rotation. The campaign entitled EPOCH92 was conducted from July 27 through August 10 with the participation of the already established space techniques, namely, VLBI and SLR. We participated in EPOCH92 as the network center of the VLBI Pacific network and organized five 24-hour session observations during the 2-week campaign. Correlation processing made at the correlation center at the US Naval Observatory was recently completed and the database has been delivered to the worldwide analysis centers. One of the scientific objectives of the research project supported by the scientific grant-in-aid is to clarify the characteristics of rapid earth rotation by an … More alyzing the VLBI data obtained during the EPOCH92 campaign. The research group has just started analysis of the VLBI database. The results of analysis will be presented at the coming international meetings.(2) Southern extension of the radio reference frameWe conducted VLBI observations using the network involving an Australian station, Tasmania. Due to the participation of the southern station, we could observe radio sources of declinations down to -30゚ and thereby contribute to extending the radio reference frame to the southem hemisphere with high accuracy. We also investigated position changes of all the observed radio sources and found that several of them have shown position changes probably due to the structure changes.2. Station displacements due to atmospheric loading effectsIn consideration of the current accuracy in three-dimensional positioning by VLBI is approaching to sub-centimeter level, it is indispensable to model all possible geophysical factors yielding this amount of displacements. In particular, modeling vertical displacement is essential in monitoring the sea level change in the context of global change. Atmospheric loading effect is one of them causing a few mm to a few cm vertical displacements.Based on the global pressure data calculated by the Japan Meteorological Agency, we estimated the vertical Displacements of all the stations taking account of the characteristics of ocean responses. The results parameterized by the sitesurface pressure data have been incorporated in the VLBI analysis software. Less
1. VLBI观测取得的成果 (1)探测地球自转快速变化 国际地球自转服务组织(IERS)和国际GPS地球动力学服务组织(IGS)联合组织了国际观测活动,以研究GPS探测地球自转快速变化的可行性。名为EPOCH92的活动于7月27日至8月10日进行,已有的空间技术,即VLBI和SLR参与其中。我们作为 VLBI Pacific 网络的网络中心参加了 EPOCH92,并在为期 2 周的活动中组织了 5 次 24 小时会话观测。美国海军天文台相关中心的相关处理已于近期完成,数据库已交付至全球分析中心。由科学资助金支持的研究项目的科学目标之一是通过分析 EPOCH92 活动期间获得的 VLBI 数据来阐明地球快速自转的特征。研究小组刚刚开始对VLBI数据库进行分析。分析结果将在即将召开的国际会议上公布。(2)无线电参考系的南延 我们利用澳大利亚塔斯马尼亚站的网络进行了VLBI观测。由于南站的参与,我们可以观测到低至-30°的射电源,从而有助于将射电参考系高精度地扩展到南半球。我们还调查了所有观测到的射电源的位置变化,发现其中一些射电源的位置变化可能是由于结构变化所致。2.大气载荷影响引起的台站位移考虑到目前VLBI三维定位的精度已接近亚厘米级,对产生这种位移量的所有可能的地球物理因素进行建模是必不可少的。特别是,垂直位移建模对于监测全球变化背景下的海平面变化至关重要。大气载荷效应是造成几毫米到几厘米垂直位移的原因之一。根据日本气象厅计算的全球气压数据,考虑海洋响应的特点,估算了所有站点的垂直位移。由现场表面压力数据参数化的结果已纳入 VLBI 分析软件中。较少的
项目成果
期刊论文数量(112)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
横山 紘一: "国際測地学および地球物理学連合第20回総合報告地球回転" 測地学会誌. 37. 289-293 (1991)
Koichi Yokoyama:“国际大地测量学和地球物理学联合会第 20 次地球自转综合报告”大地测量学会杂志 37. 289-293 (1991)。
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Sasao,T.,Tamura,Y.,et al.: "High Precision geodesy and Astrometry with Antennacluster-Antennacluster VLBI System" Proceedings,Intern.Workshop for Reference Frames and Technical Development in Space Geodesy. 91-96 (1993)
Sasao,T.,Tamura,Y.,等人:“使用天线簇-天线簇 VLBI 系统进行高精度大地测量和天体测量”论文集,空间大地测量参考系和技术开发实习生研讨会。
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Yokoyama,K.: "Summary Report of the International earth Rotation Service for the Period from August 1987 through July 1991" Travaux de l'Association Internationale de Geodesie. 29. 524-550 (1992)
Yokoyama,K.:“1987 年 8 月至 1991 年 7 月期间国际地球自转服务摘要报告”Travaux de lAssociation Internationale de Geodesie。
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Yokoyama,K., and Feissel,M.: "International Earth Rotation Service" IAU Information Bulletin. 65. 18-20 (1991)
Yokoyama,K. 和 Feissel,M.:“国际地球自转服务”IAU 信息公告。
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Manabe,S.: "Geodetic Parameters Obtained with International VLBI Observations" ibid.(1993)
Manabe,S.:“利用国际 VLBI 观测获得的大地测量参数”同上。(1993)
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YOKOYAMA Koichi其他文献
YOKOYAMA Koichi的其他文献
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{{ truncateString('YOKOYAMA Koichi', 18)}}的其他基金
Development of an seismic damage detection technology for civil infrastructures
民用基础设施震害检测技术开发
- 批准号:
20360197 - 财政年份:2008
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of an early seismic damage detection technology for civil infrastructures
民用基础设施早期震害检测技术的开发
- 批准号:
18360211 - 财政年份:2006
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of an seismic damage detection system for civil infrastructures
民用基础设施地震损伤检测系统的开发
- 批准号:
15206054 - 财政年份:2003
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Development of model for comprehensive environmental assessment of bridge vibration induced by traveling vehicles.
桥梁行驶车辆振动综合环境评价模型开发
- 批准号:
11650476 - 财政年份:1999
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
DEVELOPMENT OF AN INTERFACE SYSTEM TO ENSURE COMPATIBLITY OF THE EXITING VARIOUS VLBI RECORDING SYSTEMS FOR GLOBAL GEODETIC OBSERVATIONS
开发接口系统以确保现有各种 VLBI 记录系统与全球大地测量观测的兼容性
- 批准号:
07404022 - 财政年份:1995
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Establishment of the Trans-Pacific VLBI Network for Monitoring the Earth's Variable Rotation
建立跨太平洋地球自转监测VLBI网络
- 批准号:
62420003 - 财政年份:1987
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for General Scientific Research (A)
相似海外基金
Variation in the Earth's rotation and its relation to global climate change
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- 批准号:
15K05038 - 财政年份:2015
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Grant-in-Aid for Scientific Research (C)
Travel to Attend: International Symposium on Nutation and The Earth's Rotation (Iau Symposium No. 78), Kiev, Ussr, 05/23-28/77
前往参加:国际章动和地球自转研讨会(Iau 第 78 号研讨会),苏联基辅,05/23-28/77
- 批准号:
7709980 - 财政年份:1977
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$ 4.22万 - 项目类别:
Standard Grant
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生长节律:直接确定过去地球自转速率的一种方法
- 批准号:
7500345 - 财政年份:1975
- 资助金额:
$ 4.22万 - 项目类别:
Standard Grant