GRACE Gravity Field Determination Using the Celestial Mechanics Approach – First Results
GRACE Gravity Field Determination Using the Celestial Mechanics Approach – First Results
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DOI：
10.1007/978-3-642-10634-7_24
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
A. Jäggi;G. Beutler;L. Mervart
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文献类型：
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作者：
A. Jäggi;G. Beutler;L. Mervart
我们提出了第一个重力场模型AIUB-GRACE01S，它是用天体力学方法在扩展版本中生成的。在一个广义定轨问题中，利用星间K波段测距率观测和GPS的运动位置来求解地球重力场参数。除了归一化球谐(SH)系数外，还将初始条件和伪随机脉冲等特定于电弧的参数设置为所有测量类型的公共参数。我们的第一个基于1年GRACE数据的结果表明，即使使用EGM96作为先验模型，并且没有加速度计数据和复杂的背景模型(如短期质量变化)，也可以很好地恢复地球静态重力场。然而，在不久的将来，使用加速度计数据和复杂的背景模型将是进一步改进推断的重力场解决方案的先决条件。
We present the first gravity field model AIUB-GRACE01S, which has been generated using the Celestial Mechanics Approach in an extended version. Inter-satellite K-band range-rate observations and GPS-derived kinematic positions are used to solve for the Earth’s gravity field parameters in a generalized orbit determination problem. Apart from the normalized spherical harmonic (SH) coefficients, arc-specific parameters like initial conditions and pseudo-stochastic pulses are set up as common parameters for all measurement types. Our first results based on 1 year of GRACE data demonstrate that the Earth’s static gravity field can be recovered with a good quality, even using EGM96 as a priori model and without accelerometer data and sophisticated background models like short-term mass variations. The use of accelerometer data and sophisticated background models will be a prerequisite for the near future, however, to further improve the inferred gravity field solutions.