Energy integral method for gravity field determination from satellite orbit coordinates
Energy integral method for gravity field determination from satellite orbit coordinates
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DOI：
10.1007/s00190-003-0315-8
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发表时间：
2003-06
影响因子：
4.4
通讯作者：
P. Visser;N. Sneeuw;C. Gerlach
中科院分区：
文献类型：
--
作者：
P. Visser;N. Sneeuw;C. Gerlach
提出了一种由低轨卫星轨道坐标确定重力场的快速迭代方法，并成功地实现了该方法。该方法以能量守恒为基础，避免了与轨道动力学和初始状态有关的问题。此外，利用重复轨道的特定几何形状，通过使用一个非常有效的迭代估计方案，其中一组正常方程近似的稀疏块对角等效。利用29天的轨道坐标模拟数据，进行了80阶和120阶球谐重力场模型的恢复试验。该方法被认为是非常灵活的，可以很容易地调整，包括非保守的加速度观测，如（将）提供的卫星，如CHAMP，GRACE，GOCE。该方法的一个严重缺点是它对卫星速度误差的敏感性很大。现有的轨道确定策略需要改变或增强，以包括侧重于优化估计速度的准确性的算法。
A fast iterative method for gravity field determination from low Earth satellite orbit coordinates has been developed and implemented successfully. The method is based on energy conservation and avoids problems related to orbit dynamics and initial state. In addition, the particular geometry of a repeat orbit is exploited by using a very efficient iterative estimation scheme, in which a set of normal equations is approximated by a sparse block-diagonal equivalent. Recovery experiments for spherical harmonic gravity field models up to degree and order 80 and 120 were conducted based on a 29-day simulated data set of orbit coordinates. The method was found to be very flexible and could be easily adapted to include observations of non-conservative accelerations, such as (to be) provided by satellites like CHAMP, GRACE, and GOCE. A serious drawback of the method is its large sensitivity to satellite velocity errors. Existing orbit determination strategies need to be altered or augmented to include algorithms that focus on optimizing the accuracy of estimated velocities.