The Experimentation and Verification Network (EVnet) is a near real-time facility capable of acquisition, processing and distribution of GNSS as well as GNSS-related data. It consists of a set of currently 14 sensor stations (June 2011) distributed worldwide, a Central Processing and Control Facility (CPCF) installed and operated at the DLR campus Neustrelitz and different External Processing Facilities, as well as application-specific user components.
Overview on current EVnet stations
EVnet supports the reception and distribution of GPS, GLONASS, GIOVE and EGNOS raw data. The measurement data collected includes pseudo range, carrier phase, Doppler shift, carrier to noise ratio and amplitude. The system will be continuously extended by new GNSS receivers for modernized as well as upcoming signals (GALILEO, COMPASS). All data are stored in databases for long term analysis.
The most important benefit of EVnet consists in its capability to develop, analyze and validate new algorithms and methods using a modular and flexible processing environment. This environment is based on a GNSS framework and allows internal and external colleagues and partners to share their work on innovative ideas and complex applications. The system can be combined at will with extended navigational equipment and can furthermore be expanded to up to 50 stations and more than 100 user components. Thus, EVnet is well-suited for future activities like the implementation of inertial measurement equipment and other position, navigation and timing (PNT) relevant sensors.
As an additional task, EVnet acts as a development environment for scientists and engineers to validate new algorithms and methods and to develop real time applications with a strong focus on ionospheric services as well as ground-based augmentation systems. In this context, EVnet plays also an important role as a basic infrastructure component for national and international projects. In detail, it is used for the composition of a sensor station network for the monitoring of ionospheric scintillation effects and as a primary development and service platform for our Ground-Based Augmentation Systems (GBAS) at the research airport of Braunschweig as well as the research harbor of Rostock. Additionally, some of the EVnet stations complement the Cooperative Network for GIOVE Observation (CONGO), which was established in 2008 by the German Space Operations Center (DLR/GSOC) and the Federal Agency for Cartography and Geodesy (BKG) as an early test bed for experimentation with new GNSS signals.
Since 2010, a dedicated EVnet station has been part of the GALILEO Control Centre in Oberpfaffenhofen/Germany and is used to support ESA within specific validation experiments. In the near future the station will become an add-on to the Galileo Experimental Sensor Station (GESS) network.
Moreover, EVnet is being prepared and adapted to receive and process signals from the upcoming GALILEO IOV phase satellites.