Galileo Receiver Performance Under GPS Interference and Multipath With the GRANADA Software Receiver

Antonio Fernández, José Diez, Livio Marradi and Vincent Gabaglio

Abstract:	Among its priorities, the Galileo Joint Undertaking (GJU) is in charge of managing the Research and Development activities related to the Galileo Programme. In the context of the European Commission 6th Framework Programme, GJU has initiated the Galileo Receiver Preliminary Development. Presently the GAlileo Receiver Development Activities (GARDA) project is running at this scope. This paper focuses on the Galileo Receiver ANAnalysis and Design Application (GRANADA), a new concept of Galileo SW Receiver, which development is part of the GARDA project. The tool is being developed by Deimos Space under Laben specification. A Software (SW) Receiver is a key element in the GARDA project. GRANADA covers a dual role: testbench for integration and evaluation of receiver technologies on one side, and SW receiver as asset for GNSS application developers on the other side. GRANADA is conceived as a modular and configurable tool, in which the user can embed and test his/her own algorithms with a user-friendly interface. It runs on a standard Windows PC, allowing the maximum use form people not involved in the development. The application recreates the bit-true signal processing chain of a Galileo receiver. It models the RF front-end, and processes IF measurements, including the correlation and filtering, signal and data processing and PVT computation, allowing the use of GPS combined with Galileo. It performs analysis and trade-off of several receiver key technologies, such as E5 signal, BOC (binary offset carrier) modulation, utilisation of the pilot tone, receiver architecture, satellites selection strategies, interference mitigation, cycle slip detecting and correcting or multi-carrier phase ambiguity resolution. The receiver architecture is based on GARSIM (Galileo Receiver Simulator) [1], also developed by Deimos and Laben, under ESA contract, for the Pre-development of the Galileo Ground Segment Reference Receiver. The paper provides a description of GRANADA, focusing on the bit-true receiver architecture. Simulation results on Galileo/GPS interoperability (assessment of GPS interference on Galileo) and multipath analyses are also presented.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1027 - 1034
Cite this article:	Fernández, Antonio, Diez, José, Marradi, Livio, Gabaglio, Vincent, "Galileo Receiver Performance Under GPS Interference and Multipath With the GRANADA Software Receiver," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1027-1034.
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