GALILEO system overview (original) (raw)
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Signals and Communication Technology, 2014
This chapter provides an introduction to the Galileo program and architecture. It starts by presenting the program context, rationale and history, including the early definition phases and test beds and the GIOVE experimental satellites. It then presents an overview of the Galileo services. Later, an architectural overview is provided, including the Galileo segments: the Space Segment, the Ground Mission Segment, and the Ground Control Segment. The chapter also provides a description of Galileo's contribution to the Search And Rescue services through COSPAS/SARSAT, and finalizes with an overview of the user segment and highlighting interoperability and compatibility issues with other GNSS.
The european satellite navigation system Galileo
Wuhan University Journal of Natural Sciences, 2003
This paper starts with a brief discussion of the Galileo project status and with a description of the present Galileo architecture (space segment, ground segment, user segment). It focuses on explaining special features compared to the American GPS system. The presentation of the user segment comprises a discussion of the actual Galileo signal structure. The Galileo carder frequency, modulation scheme and data rate of all 10 navigation signals are described as well as parameters of the search and rescue service. The navigation signals are used to realize three types of open services, the safety of life service, two types of commercial services and the public regulated service. The signal performance in terms of the pseudorange code error due to thermal noise and multipath is discussed as well as interference to and from other radionavigation services broadcasting in the F_,5 and E6 frequency band. The interoperability and compatibility of Galileo and GPS is realized by a properly chosen signal structures in E5a/L5 and E2-L1-E1 and compatible geodetic and time reference frames. Some new results on reciprocal GPS/Galileo signal degradation due to signal overlay are presented as well as basic requirements on the Galileo code sequences.
Galileo Has – First Performance Tests During Its Initial Phase of Operation
Aviation and Security Issues, 2023
Galileo High Accuracy Service (HAS) became available in January 2023. As declared, in its final operational capability, it should be able to provide to users the Precise Point Positioning (PPP) at horizontal accuracy level better than 20 cm in real-time with 95% confidence globally. At the moment Galileo HAS works in its initial phase of operation with some limitations regarding its availability, convergence time and accuracy but gives the chance to observe the performance of positioning tool at the accuracy level which was available before by using differential measurement only. Galileo HAS PPP, free of charge and based only on satellite signals delivered by nominal Galileo constellation is unique in its kind between various GNSS positioning modes. This article presents the results of first, preliminary tests on Galileo HAS performance conducted in July 2023 in Gdynia, Poland. The field tests were conducted with Galileo HAS capable receiver in static conditions and focused on the verification the declared service performance in the real positioning scenarios. Additionally, the Galileo HAS PPP performance was compared with the simultaneous performance of other GNSS positioning methods such as EGNOS, DGPS, dual frequency GPS+Galileo or dual frequency GPS and dual frequency Galileo. This first experiences with Galileo HAS positioning should show all potential users what performance level can be achieved with this new, unique in its kind GNSS positioning method at the present state of its implementation.
Simulation of a Feasible Galileo System Operating in L1 and E5 Bands
Galileo is the program that has been launched by the European Union for the purpose of building a Global Navigation Satellite System (GNSS) for serving civilians and to exist under civil control. Our project combines many previous researched scenarios for Galileo system to a final one, which has been simulated and adjusted to meet the most demanding standards (of proposed GNSS services). The final simulated scenario is consisted of 30 (27+3 spare) satellites allocated in 3 orbital planes.
Galileo “Message Generation Facility” – Safety-critical and Real-time
2017
1. CONTEXT OF THE MGF Galileo will be an independent, global European-controlled, satellite-based navigation system. It will have a constellation of satellites monitored and controlled by a Ground Control Segment (GCS) providing also the capability to detect satellite or system malfunctions and broadcast real-time warnings (integrity messages). GALILEO is a programme sponsored by the European Space Agency and the European Union. The overall Galileo System is divided into two main segments: The Galileo Space Segment (SS) will comprise a constellation of 36 satellites in MEO. Each satellite will broadcast four ranging signals carrying clock synchronisation, ephemeris, integrity and other data, depending on the particular signal. A user equipped with a suitable receiver will be able to determine his position to within a few metres when receiving signals from visible Galileo satellites. The Galileo Ground Segment (GS) will control the whole Galileo constellation, monitor the satelli...
Experimenting Galileo on Board the International Space Station
2016
The SCaN Testbed is an advanced integrated communications system and laboratory facility installed on the International Space Station (ISS) in 2012. The testbed incorporates a set of new generation of Software Defined Radio (SDR) technologies intended to allow researchers to develop, test, and demonstrate new communications, networking, and navigation capabilities in the actual environment of space. Qascom, in cooperation with ESA and NASA, is designing a Software Defined Radio GalileoGPS Receiver capable to provide accurate positioning and timing to be installed on the ISS SCaN Testbed. The GalileoGPS waveform will be operated in the JPL SDR that is constituted by several hardware components that can be used for experimentations in L-Band and S-Band. The JPL SDR includes an L-Band Dorne Margolin antenna mounted onto a choke ring. The antenna is connected to a radio front end capable to provide one bit samples for the three GNSS frequencies (L1, L2 and L5) at 38 MHz, exploiting the ...
The DLR Project GalileoNAV: An Overview
In 2001 the DLR Institute of Communications and Navigation started an internal project called "GalileoNAV", which supports early work for the utilization, application and verification of Galileo. The project will last until 2006 and, therefore, is closely connected with the time schedule of the Galileo development and in-orbit-validation phases. The project consists of the following five main work packages: • Clock synchronization and time distribution, • Verification methods and algorithms, • Experimental verification systems, • Models and transmission methods, • Terminal development. This paper provides an overview about the structure and the main goals of the project and presents first results which have been obtained.