Epoch reference frames as short-term realizations of the ITRS - recent developments and future challenges

Epoch reference frames as short-term realizations of the ITRS - recent developments and future challenges
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作为 ITRS 短期实现的纪元参考框架 - 最新发展和未来挑战

DOI:
10.1007/1345_2015_91
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
D. Angermann
D. Angermann
中科院分区:
--
文献类型:
--
作者:
Bloßfeld M;M. Seitz;D. Angermann

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IAG(国际大地测量协会)和IERS(国际地球自转和参考系统服务)联合工作组(JWG)的“模拟环境负荷效应的参考框架实现”目前调查的影响校正站的位置非线性负荷位移的实现国际地球参考系统(ITRS)。另一个IAG/IERS联合工作组致力于单一技术和组合短期参考框架(称为历元参考框架(ERF))的频繁实现策略。这两种方法都能够解决缺乏参数化时发生的只考虑线速度的大地测量观测网站(常规参数化)。ERF可以解释任何非线性台站运动(周期性信号、位置突变、非线性区域变形、仪器相关运动等)。在这项研究中,使用具有不同时间分辨率(7天、14天和28天)的全球定位系统、VLBI、SLR大地测量空间技术的组合ERF与ITRS w.r.t.的传统多年/长期实现进行了比较。基准稳定性和对非线性台站运动进行采样的能力。7天/14天ERF能够监测短期台站运动,但基准的实现不如长期参考框架稳定。28天的ERF具有更稳定的数据,但只能监测非常缓慢的长期运动,例如地震后变形。
The IAG (International Association of Geodesy) and the IERS (International Earth Rotation and Reference Systems Service) Joint Working Group (JWG) on “Modeling environmental loading effects for reference frame realizations” currently investigates the effect of correcting station positions for non-linear loading displacements on the realization of the International Terrestrial Reference System (ITRS). Another IAG/IERS JWG works on strategies for the frequent realization of single-technique and combined short-term reference frames, which are called epoch reference frames (ERFs). Both approaches are able to resolve the lack of parametrization which occurs when only taking linear velocities of geodetic observation sites into account (conventional parametrization). ERFs can account for any non-linear station motion (periodic signals, abrupt position changes, non-linear regional deformations, instrumental-related motions, etc.) on a regional as well as on a global basis.aaaa In this study, combined ERFs using the geodetic space techniques GPS, VLBI, SLR with different temporal resolutions (7-, 14- and 28-day) are compared to conventional multi-year/long-term realizations of the ITRS w.r.t. the datum stability and the ability to sample non-linear station motions. The 7-/14-day ERFs are able to monitor short-term station motions but the realization of the datum is not as stable as for the long-term reference frames. The 28-day ERFs have a more stable datum but are only able to monitor very slow long-term motions such as post-seismic deformations.
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