Development, implementation and integration of Key Performance Indicators within the GIOVE Mission Segment

摘要

The Giove Mission Segment (GIOVE-M), part of the Galileo In-Orbit Validation (IOV) risk mitigation program, is supported by a ground infrastructure comprising the Giove Processing Centre (GPC) located at ESTEC and a worldwide network of Galileo Experimental Sensor Stations (GESSs). The GPC supports the data collection from the GESSs and the near real-time processing and uploads of the Navigation Messages through the Ground Control Centres. The space element of the GIOVE-M consists of the GIOVE-A and GIOVE-B satellites.One of the fundamental functions of the Giove Processing Centre is to continuously monitor its system and processing functions as well as the quality of the collected data from the GESS network to ensure uninterrupted Operations and quality of the services provided to the GIOVE-M experimenters.Following the recent launch of GIOVE-B a number of upgrades to the GIOVE-M infrastructure have been required to support the expected experimentation and risk mitigation activities. In particular the GPC is being upgraded to implement new capabilities to generate and report on a set of Key Performance Indicators to continuously measure the quality of the GPC processing.The Key Performance Indicators (KPI) cover the areas of the Navigation Message performances including the Orbit Determination and Time Synchronization (OD&TS) processing performances, the Orbits and Clock prediction accuracy, the Experimental Galileo to GPS Time Offset (EGGTO) determination and prediction accuracy, the Broadcasted Group Delay (BGD) stability and the input data latency and completeness for the OD&TS processing. The KPI will also cover the Experimental GIOVE System Time (EGST) stability, the Intersystem Bias and the delay and validity of the generated and received Navigation Messages.The Key Performance Indicators are generated by a software tool developed on a dedicated Giove Processing Centre facility. The present paper describes the initial design and subsequent development of the Key Performance Indicators tool. Initial results of this as well as the configuration, statistics and reporting capabilities of the tool are also presented.The issues, limitations, advantages and strategies that have been adopted to critically evaluate the Key Performance Indicators over the near real-time GPC processing are also discussed. The paper concludes by reporting on the major interest of the KPI tool with regards to the future Galileo operations in particular in terms of consolidation of the mission support facilities needs.