Alternative Definitions of the Terrestrial Reference System and Its Realization in Reference Frames
Alternative Definitions of the Terrestrial Reference System and Its Realization in Reference Frames
复制标题
地球参考系的替代定义及其在参考系中的实现
DOI：
10.1007/978-3-642-32998-2_7
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Seitz M.
中科院分区：
文献类型：
--
作者：
Drewes H;Angermann D;Seitz M.
国际地球参考系 (ITRS) 由 IERS 公约定义为原点位于地球质心的地心系统。它是通过地壳固定参考站框架（ITRF）实现的。本文以地球科学研究所需的高精度来讨论这些规范的替代实现。地心坐标系将原点永久固定在地球质心，而地壳固定坐标系随地壳移动，坐标系的原点可能会偏离地心（“地心运动”）。讨论了这两种定义的特点和实现以及它们的优点和缺点。参考系的计算与观测网络高度相关。在全球参考系中，网络站应均匀分布在地球上。站群通过可能的系统（例如气候）效应影响框架，特别是在应用相似性（赫尔默特）变换时。网络中稀疏占据区域中的全局框架的致密化最终会遭受由不均匀站点分布造成的最终扭曲。参考框架的时间演化目前仅通过长时间间隔内的线性站点坐标变化（恒定速度）来完成。不考虑季节变化。 2010 年智利地震的经验证明了短时滞连续参考系的必要性。本文讨论了替代方案。
The International Terrestrial Reference System (ITRS) is defined by the IERS Conventions as a geocentric system with the origin in the Earth’s centre of mass. It is realized by a crust-fixed frame of reference stations (ITRF). The paper deals with alternative realizations of these specifications with the high accuracy needed in geosciences research.A geocentric frame fixes the origin permanently in the Earth’s centre of mass, while a crust-fixed frame moves with the Earth’s crust, and the origin of the coordinate system may depart from the geocentre (“geocentre motion”). The characteristics and realizations of both definitions are discussed along with their advantages and shortcomings.The computation of the reference frame is highly correlated with the observed network. In a global reference frame, the network stations should be distributed homogeneously over the Earth. Clusters of stations affect the frame by possible systematic (e.g. climatic) effects, in particular when applying similarity (Helmert) transformations. Densifications of the global frame in sparsely occupied regions of the network suffer from eventual distortions created by inhomogeneous station distributions.The time evolution of the reference frames is at present done by linear station coordinate changes (constant velocities) over long time intervals only. Seasonal variations are not considered. Experiences with the Chile 2010 earthquake demonstrate the necessity of successive reference frames with short time lag. Alternatives are discussed in the paper.
影响因子：
3.9
作者：
Altamimi, Z.;Collilieux, X.;Boucher, C.
通讯作者：
Boucher, C.
SIRGAS项目中参考系统的定义与实现
DOI：
--
发表时间：
1998
期刊：
影响因子：
--
作者：
Melvin Hoyer;Susana R. Arcienagas;Katia Duarte Pereira;Hervé Fagard;R. Maturana;R. Torchetti;H. Drewes;Muneendra Kumar;G. Seeber
通讯作者：
G. Seeber