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| 引用本文： | 徐天河,贺凯飞.?????????CHAMP??????????е????[J].大地测量与地球动力学,2008,28(2):81-85. |
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| 作者姓名： | 徐天河 贺凯飞 |
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| 作者单位： | 1. 西安测绘研究所,西安,710054;武汉大学测绘学院,武汉,430079
2. 长安大学,西安,710054 |
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| 摘 要： | ??????????CHAMP?????????????????????????????н?????1???????????С?????LS??????????CHAMP?????????????????????????????????????????????????????????????????????????????????????CHAMP??????????У???????????????????????????1?GFZ????????????1???? CHAMP????RSO????????????????????????20???????(5??100) m 2s -2??С??????????????LS????????????60??60???????????????????EIGEN??CG03C??EIGEN2???????б?????????????????????Ч?????????????????CHAMP????????????????????LS???????????????ε?EGM96??EIGEN1S??EIGEN2????
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| 关 键 词： | CHAMP???? ??С???? ??????? ?????????(RSO) GFZ???????? |
| 文章编号： | 1671-5942(2008)02-0081-05 |
| 修稿时间： | 2007年10月29 |
APPLICATION OF ROBUST ESTIMATION TO CHAMP GRAVITY FIELD RECOVERY |
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| Xu Tianhe,He Kaifei.APPLICATION OF ROBUST ESTIMATION TO CHAMP GRAVITY FIELD RECOVERY[J].Journal of Geodesy and Geodynamics,2008,28(2):81-85. |
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| Authors: | Xu Tianhe He Kaifei |
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| Institution: | 1）Xi’an Research Institute of Surveying and Mapping, Xi’an 7100542）School of Geodesy and Geomatics, Wuhan University, Wuhan 4300793）Chang’an University , Xi’an 710054 |
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| Abstract: | A numerical simulation was made to examine the influence of outliers on CHAMP gravity field recovery. It shows that the model accuracy from least square ( LS) estimation is wholly decreased even if with only one large outlier occurs, and there is a large bias in geoid heights in the large area around the location where the outlier exists. In order to overcome this problem, robust estimation is intruduced into the CHAMP gravity field recovery and its influence function of errors is also given.For one month CHAMP rapid science orbit(RSO) and accelerometer data from GFZ with randomly added to simulated outliers from 5 to 100
m 2s -2 two 60×60 degree gravity field models were solved by LS and robust estimation individually and compared with other models such as EIGEN CG03C,EIGEN2. The results show that the robust solution can efficiently control the influence of the outliers. RO CHAMP model is obviously more accurate than LS CHAMP one, and more accurate than EGM96, EIGEN1S, and EIGEN2 at the same degree and order. |
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| Keywords: | satellite CHAMP Least Square robust estimation rapid science orbits(RSO) GFZ(Geo Forschungs Zentrum) |
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