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| 1 | 基于B-spline和正则化算法的低轨卫星轨道平滑显示文摘本文提出了一个利用纯几何轨道和力模型的新算法来计算精确且相对平滑的卫星轨道.该法将一个纯几何轨道表达为一个B-spline的线性组合,线性组合的系数可以由最小二乘法估计获得.力模型通过计算加速度来附加约束.为了平衡几何轨道的点位误差和加速度的不精确,一个基于“广义交互确认(GCV,generalizedcross-validation)”的正则化算法运用其中.由于B-spline的本地控制性,该方法的计算效率相当高.本文的数值分析表明了该法的有效性.模拟计算的结论是:带加速度约束较不带加速度约束的平滑效果好.力模型越精确,平滑的轨道就越精确.三个月的CHAMP实测轨道数据处理结果表明,平滑后的轨道改进了重力场模型. | 柳响林 Pavel Ditmar | 2006 | 地球物理学报2006，49，1： | 10 |
| 2 | Computation of Spherical Harmonic Coefficients from Satellite Gravity Gradiometry Data:Regularization Issues显示文摘 | Ditmar P Kusche J Klees R | 2003 | Journal of Geodesy2003，77，7： | 1 |
| 3 | Dependence of the Earth's Gravity Model Derived from Satellite Accelerations on a Priori Information显示文摘 | Ditmar P Liu Xianglin | 2007 | Journal of Geodynam- ics2007，43，： | 1 |
| 4 | A Technique for Modeling the Earth's Gravity Field on the Basis of Satellite Accelerations显示文摘 | Ditmar P van eck van der Sluijs A A | 2004 | Journal of Geodesy2004，78，12： | 1 |
| 5 | Our experience with 3D CT显示文摘 | Pach M Ditmar R HermanM | 1999 | Acta Aniv Palacki Olomuc Fac Med1999，142，： | 1 |
| 6 | Computation of Spherical Har- monic Coefficients from Gravity Gradiometry Data to be Acquired by the GOCE Satellite: Regulariza- tion Issues显示文摘 | Ditmar P Kusche J | 2003 | Journal of Geodesy2003，77，78： | 1 |
| 7 | Enthalpy and heat-capacity standard reference material: synthetic sapphire (α-Al2O3) from 10 to 2250 K显示文摘 | Ditmars D A Ishihara S Chang S S | 1982 | J Res Natl Bur Stand1982，87，： | 1 |
| 8 | Fast and accurate computation of spherical harmonic coefficients from satellite gravity gradiometry data显示文摘 | Ditmar P Klees R and Kostenko F | 2003 | Journal of Geodesy2003，76，： | 1 |
| 9 | Botulinum toxin type A: atreatment option for digital ischemia in patients with Raynaud'sphenomenon显示文摘 | Fregene A Ditmars D Siddiqui A | 2009 | J Hand Surg Am2009，34，3： | 1 |
| 10 | Enthalpy and heat capacity standard referencematerial: synthetic sapphire (α-Al2O3) from 10 to 2250 K 显示文摘 | Ditmars D A Ishihara S Chang S S | 1982 | J Res Natl Bur Stand (US)1982，87，： | 1 |
| 11 | Water storage variations of the Yangtze,Yellow,and Zhujiang river basins derived from the DEOS Mass Transport (DMT-1) model显示文摘In general,China is short of water resources and some regions even experience a shortage of daily water supply.This could threaten the stability and economic development of the nation.A study on the water storage variations is especially important for the water management and storage prediction in three largest river basins of China,namely,Yangtze,Yellow,and Zhujiang,where the most dense population and leading economic regions are located.The satellite gravity mission GRACE(Gravity Recovery and Climate Experiment) provides an opportunity to macroscopically identify water(or mass) variations in the Earth's system with a spatial resolution of 300-400 km and a temporal resolution of about one month.We use the first release of the DEOS(Delft Institute of Earth Observation and Space Systems) Mass Transport(DMT-1) model based on GRACE data to analyze water storage changes in the three river basins.The DMT-1 model consists of monthly solutions,which are computed using an innovative methodology.The methodology includes,in particular,the application of a statistically optimal Wiener-type filter based on full variance-covariance matrices of noise and signal.This results in particularly sharp mass variation maps.Taking one monthly solution as an example,we compare the results derived from the DMT-1 model with ones produced with the standard post-processing scheme based on a combination of the de-striping and Gaussian filtering.The comparison shows that the DMT-1 model outperforms the other models and is suitable for the analysis of the mass changes in river basins.A subset of the DMT-1 solutions in the interval between February 2003 and May 2008 is used to estimate the secular trends and seasonal variations for the three river basins.The estimated trends show that the water storage of the Yellow River basin does not have significant changes,while the Zhujiang and Yangtze river basins have a large and statistically significant water storage increase.The estimation of seasonal variations demonstrates that the water storage variations in Yangtze and Zhujiang river basins are almost in the same phase.The amplitude of variations in the Zhujiang River basin is larger than that in Yangtze.No clear annual variations are observed in the Yellow River basin.The observed water storage variations generally coincide with the observations and conclusions presented in the hydrological reports of the Chinese Ministry of Water Resources. | ZHAO QiLe LIU XiangLin Pavel DITMAR Christian SIEMES Elena REVTOVA Hassan HASHEMI-FARAHANI Roland KLEES | 2011 | Science China Earth Sciences2011，54，5： | 1 |
| 12 | Fast and accurate computation of spherical hormonic coefficients from satellite gravity gradiometry data 显示文摘 | Ditmar P | 2003 | Journal of Geodysy2003，26，： | 1 |
| 13 | The Static Gravity Field Model DGMIS from GRACE and GOCE Data: Computation, Validation and an Analysis of GOCE Mission's Added Value 显示文摘 | Hashemi F H Ditmar P Klees R | 2013 | Journal of Geodesy2013，87，9： | 1 |
| 14 | Two new species of Sellaphora(Bacillariophyta) from a deep oligotrophic plateau lake,Lake Fuxian in subtropical China显示文摘We describe two new species of Sellaphora from Lake Fuxian,Yunnan Plateau,China.Based on both light and scanning electron microscopy,these species are described as S.yunnanensis sp.nov.and S.sinensis sp.nov.The primary features of S.yunnanensis are:elliptical to linear-elliptical valves with broadly rounded ends,straight filiform raphe,almost straight central endings and small,slightly expanding central pores,small central area,symmetrical or slightly asymmetrical central nodule.The primary features of S.sinensis are:elliptical valves,obtusely rounded ends,similar raphe and axial area,transapically less expanded central area,larger,elliptical central nodule.We compare these species to those of a similar shape and morphology. | 李艳玲 METZELTIN Ditmar 龚志军 | 2010 | Chinese Journal of Oceanology and Limnology2010，28，6： | 1 |
| 15 | Enthalpy and heat capacity standard reference material: synthetic sapphire (α-Al2O3) from 10 to 2250 K显示文摘 | Ditmars D A Ishihara S Chang S S | 1982 | J Res Nat Bur Stand1982，87，6： | 1 |
| 16 | Osteoporosis treated with magnesium lactate 显示文摘 | Steidl L Ditmar R | 1991 | Acta Univ Palacki Olomuc Fac Med1991，129，： | 1 |
| 17 | A Technique for Earth's Gravity Field Modeling on the Basis of Satellite Accelerations显示文摘 | Ditmar P van Eck van der Sluijs A A | 2004 | J Geod2004，78，： | 1 |
| 18 | DEOS_CHAMP-01C_70': a Model of the Earth's Gravity Field Computed from Accelerations of the CHAMP Satellite显示文摘 | Ditmar P Kuznetsov V van Eck van der Sluijs A A | 2006 | J Geod2006，79，1011： | 1 |
| 19 | Dependence of the Earth's Gravity Model Derived from Satellite Accelerations on a Priori Information显示文摘 | Ditmar P Liu Xianglin | 2007 | Journal of Geodynam- ics2007，43，： | 1 |
| 20 | A technique for modeling the Earth’s gravity field on the basis of satellite accelerations显示文摘 | P. Ditmar A. A. van Eck van der Sluijs | 2004 | Journal of Geodesy (-)2004，，1： | 1 |
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