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低轨道人造卫星(CHAMP、GRACE、GOCE)与高精度地球重力场——卫星重力大地测量的最新发展及其对地球科学的重大影响 被引量:69
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作者 孙文科 《大地测量与地球动力学》 CSCD 2002年第1期92-100,共9页
评述了卫星重力大地测量的最新发展及其对地球科学的重大影响。为了更好地理解地球内部物理构造与海洋动力学 ,以及大陆、冰川和海洋的相互作用 ,改善现有地球重力场模型 (包括精度和空间解析度 )是非常重要的。IU GG等国际组织对此已... 评述了卫星重力大地测量的最新发展及其对地球科学的重大影响。为了更好地理解地球内部物理构造与海洋动力学 ,以及大陆、冰川和海洋的相互作用 ,改善现有地球重力场模型 (包括精度和空间解析度 )是非常重要的。IU GG等国际组织对此已经强调了很多年。最近 ,由德国的 GFZ(Geo Forschungs Zentrum) ,美国的 NASA(Na-tional Aeronautics and Space Adminitration)以及欧洲宇航局 ESA(European Space Agency)开发研制了最先进的地球监测技术—— SST(Satellite- to- Sateilite Tracking)。其主要特点是利用现有的 GPS连续追踪新发射低轨道卫星 ,并由低轨道卫星对地球重力场作精密观测。已经发射和即将发射的卫星有 3颗 :CHAMP(Challenging Mini-Satellite Payload for Geophysical Research and Application)已经于 2 0 0 0年发射 ;GRACE(Gravity Recovery andClimate Experim ent)定于 2 0 0 2年发射 ;GOCE(Gravity Field and Steady- state Ocean Circulation Explorer)计划2 0 0 4年发射。它们可以统称为重力卫星。载有 SST技术的人造卫星的主要目的是获得具有前所未有的高精度和高空间解析度的全球重力场和大地水准面模型 ,加强人们对地球内部构造的理解并为海洋和气象研究提供更好的参考。上述 3个重? 展开更多
关键词 低轨道人造卫星 卫星重力大地测量 全球重力 监测技术 地球科学
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Earth Gravity Field Recovered from CHAMP Science Orbit and Accelerometer Data 被引量:2
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作者 ZHOU Xuhua WU Bin +1 位作者 PENG Bibo XU Houze 《Geo-Spatial Information Science》 2006年第4期250-254,共5页
The earth gravity field model CDS01S of degree and order 36 has been recovered from the post processed Science Orbits and on-board accelerometer data of GFZ’s CHAMP satellite. The model resolves the geoid with an acc... The earth gravity field model CDS01S of degree and order 36 has been recovered from the post processed Science Orbits and on-board accelerometer data of GFZ’s CHAMP satellite. The model resolves the geoid with an accuracy of better than 4 cm at a resolution of 700 km half-wavelength. By using the degree difference variances of geopotential coefficients to compare the model CDS01S with EIGEN3P, EIGEN1S and EGM96, the result indicates that the coefficients of CDS01S are most close to those of EIGEN3P. The result of the comparison between the accuracies of geopotential coefficients in the above models, indicates that the accuracy of coefficients in CDS01S is higher than that in EGM96.The geoid undulations of CDS01S and GGM01C up to 30 degrees are calculated and the standard deviation is 4.7 cm between them. 展开更多
关键词 CHAMP satellite accelerometer and orbit data Earth gravity field geoid CLC NUMBER P223
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Accuracy Analysis for SST Gravity Field Model in China 被引量:1
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作者 LUO Jia LUO Zhicai +1 位作者 ZOU Xiancai WANG Haihong 《Geo-Spatial Information Science》 2006年第4期265-268,共4页
Taking China as the region for test, the potential of the new satellite gravity technique, satelliteto-satellite tracking for improving the accuracy of regional gravity field model is studied. With WDM94 as referenee,... Taking China as the region for test, the potential of the new satellite gravity technique, satelliteto-satellite tracking for improving the accuracy of regional gravity field model is studied. With WDM94 as referenee, the gravity anomaly residuals of three models, the latest two GRACE global gravity field model (EIGEN_GRACE02S, GGM02S) and EGM96, are computed and compared. The causes for the differences among the residuals of the three models are discussed. The comparison between the residuals shows that in the selected region, EIGEN_GRACE02S or GGM02S is better than EGM96 in lower degree part (less than 110 degree). Additionally, through the analysis of the model gravity anomaly residuals, it is found that some systematic errors with periodical properties exist in the higher degree part of EIGEN and GGM models, the results can also be taken as references in the validation of the SST gravity data. 展开更多
关键词 SST gravity field CHAMP GRACE China
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