| 星间距离影响GRACE地球重力场精度研究 |
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| 引用本文： | 郑伟,许厚泽,钟敏,员美娟,周旭华.星间距离影响GRACE地球重力场精度研究[J].大地测量与地球动力学,2011,31(2):60-65. |
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| 作者姓名： | 郑伟 许厚泽 钟敏 员美娟 周旭华 |
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| 作者单位： | 1)中国科学院测量与地球物理研究所动力大地测量学重点实验室，武汉 430077;2)日本京都大学防灾研究所，京都 611-0011 日本;3)武汉科技大学应用物理系，武汉 430081= ;4)中国科学院上海天文台，上海 200030 |
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| 基金项目： | 中国科学院知识创新工程青年人才重要方向项目(KZCX2-EW-QN114);中国科学院动力大地测量学重点实验室开放基金(L09-14);中国科学院测量与地球物理研究所知识创新工程领域前沿项目; 国家自然科学青年基金(41004006); 湖北省自然科学基金(2010CDB05301); 中国测绘科学研究院地理空间信息工程国家测绘局重点实验室开放基金(201031); 湖北省耐火材料与高温陶瓷实验室—省部共建国家重点实验室培育基地开放基金(G201009) |
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| 摘 要： | 利用改进的能量守恒法,基于不同星间距离反演了120阶GRACE地球重力场.模拟结果表明:第一,基于相同的GRACE核心载荷精度指标反演长波(L≤20阶)地球重力场时,随着星间距离逐渐增大(110～330 km),累计大地水准面的精度依次提高.在20阶处,基于110 km星间距离反演精度为0.052 cm,基于220 k...
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| 关 键 词： | GRACE 星间距离 色噪声 地球重力场 能量守恒原理 |
DEMONSTRATED STUDY ON INFLUENCES OF INTERSATELLITE RANGE ON ACCURACY OF GRACE EARTH'S GRAVITATIONAL FIELD |
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| Zheng Wei,Xu Houze,Zhong Min,Yun Meijuan,Zhou Xuhua.DEMONSTRATED STUDY ON INFLUENCES OF INTERSATELLITE RANGE ON ACCURACY OF GRACE EARTH'S GRAVITATIONAL FIELD[J].Journal of Geodesy and Geodynamics,2011,31(2):60-65. |
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| Authors: | Zheng Wei Xu Houze Zhong Min Yun Meijuan Zhou Xuhua |
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| Institution: | Zheng Wei 1,2),Xu Houze 1),Zhong Min 1),Yun Meijuan 3) and Zhou Xuhua 4) 1)Key Laboratory of Dynamic Geodesy,Institute of Geodesy and Geophysics,CAS,Wuhan 430077 2)Disaster Prevention Research Institute,Kyoto University,Uji,Kyoto 611-0011,Japan 3)Department of Applied Physics,Wuhan University of Science and Technology,Wuhan 430081 4)Shanghai Astronomical Observatory,Shanghai 200030 |
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| Abstract: | The GRACE Earth’s gravitational field complete up to degree and order 120 is recovered using the improved energy conservation principle and on the basis of different intersatellite ranges. The simulative results are as follows: Firstly, based on the same accuracy indexes of GRACE key payloads, while recovering the long wavelength Earth’s gravitational field (L≤20), with the increase of intersatellite ranges (110 ~ 330 km) little by little, cumulative geoid height errors will be improved gradually. At degree 20, the accuracy of cumulative geoid height is at the level of 0.052 cm based on 110 km intersatellite range, and accuracies are 1.156 times and 1.209 times improved as using 220 km and 330 km intersatellite ranges. Secondly, while recovering the middle wavelength Earth’s gravitational field (100≤L≤120), at degree 120, the accuracy of cumulative geoid height comes to 13.052 cm based on 110 km intersatellite range, and accuracies are 1.327 times and 1.970 times degraded as using 220 km and 330 km intersatellite ranges. Lastly, intersatellite range designed as 220±50 km can effectively suppress the decrease of the accuracies of long wavelength and middle wavelength Earth’s gravitational field induced by improper range. |
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| Keywords: | GRACE intersatellite range colored noise Earth's gravitational field energy conservation principle |
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