Turbulence investigations from local VLBI interferometer and short range GNSS observations for improved modelling of atmospheric refraction variations

通过本地 VLBI 干涉仪和短程 GNSS 观测进行湍流研究，以改进大气折射变化的建模

• 批准号: 216345029
• 负责人: Privatdozent Dr.-Ing. Axel Nothnagel
• 金额: --
• 依托单位: Lehrstuhl für Geodäsie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/216345029?language=en
• 关键词: Turbulence; investigations; local; VLBI; interferometer

Simultaneous Very Long Baseline Interferometry (VLBI) and Global Navigation Satellite System (GNSS) observations in a small local network will be employed to investigate the variability of atmospheric refraction giving insights into real turbulence behaviour and providing the basis for refraction model improvements. This will be achieved with the new triple of VLBI radio telescopes at Wettzell and a local GNSS network to be set up on and around the Wettzell premises. Mitigating technique-specific error contributions, the remaining differences in arrival time and interferometer or carrier phase can be attributed to variations in atmospheric refraction which will then be related to turbulence theory. In this project we will employ a geodetic observing cluster which will be the first and so far only integrated instrument in the world allowing the investigation of a variety of short-time discretisations of radio fre-quency refraction effects. The results of the project will be an enhanced quantification of local atmos-pheric refraction variations in space and time addressing and realizing a variety of interpretations and model improvements. Since atmospheric refraction is the limiting factor of any further improvements in accuracy, our results will serve to advance the quality of all kinds of space-geodetic observations at radio frequencies for precise positioning and monitoring Earth rotation.

将在一个小型局部网络中同时进行甚长基线干涉测量和全球导航卫星系统观测，以研究大气折射的变化，从而深入了解真实的湍流行为，并为折射模型的改进提供基础。这将通过在Wettzell的新的三重VLBI射电望远镜和将在Wettzell房地及其周围建立的本地GNSS网络来实现。为了减轻特定技术的误差贡献，到达时间和干涉仪或载波相位的剩余差异可以归因于大气折射的变化，这将与湍流理论有关。在这个项目中，我们将使用一个大地测量观测集群，这将是世界上第一个也是迄今为止唯一一个允许调查无线电频率折射效应的各种短期离散化的综合仪器。该项目的成果将是加强对当地大气折射在空间和时间上的变化的量化，解决和实现各种解释和模型改进。由于大气折射是任何进一步提高精度的限制因素，我们的研究结果将有助于提高各种无线电频率空间大地测量观测的质量，以精确定位和监测地球自转。