Investigation of sub-daily and episodic variations of Earth rotation observed by VLBI, ring laser gyroscopes and GNSS

SPEED项目的主要目标是至少在三年内观测高质量的地球自转参数系列，其时间分辨率为一小时或更短，这些数据来自各种现代大地测量技术，即全球导航卫星系统（全球定位系统+全球轨道导航卫星系统）、甚长基线测量和环形激光陀螺仪，并对这些系列进行简要解释。调查将集中在一个几乎完整的大气和海洋现象的建模，这是最有可能的地球自转的短周期变化的来源，周期从几天到几个小时。由于所观测到的ERP时间序列的前所未有的分辨率以及基于地球物理数据的大气和海洋激发的详细建模，ERP的准周期性、非周期性和情景性变化应该是第一次可检测的。在每种技术中，使用不同的软件包对相同数据进行结果验证，并由两个分析中心独立分析这些数据，将提供最高的稳健性和可靠性。

The primary objectives of project SPEED are to observe high-quality Earth rotation parameter (ERP) series over at least three years with a time resolution of one hour or less derived from various modern geodetic techniques, namely GNSS (GPS+GLONASS), VLBI, and ring laser gyroscopes, and to provide a concise interpretation of these series. The investigations will concentrate on an almost complete modeling of atmospheric and oceanic phenomena, which are the most likely source of short period variations of Earth rotation with periods of few days down to few hours. Because of the unprecented resolution of the observed ERP time series and the detailed modeling of atmospheric and oceanic excitation based on geophysical data quasi-periodic, a-periodic, and episodic variations of the ERP should be detectable for the first time. Within each technique validation of the results using different software packages for the same data and analyzing these data independently by two analysis centers will provide highest robustness and reliability.