Enhancing Usability of the GRANADA Bit-True Receiver Simulation on Galileo L1

Heikki Hurskainen, Xuan Hu, Sireesha Ancha, Graham Bell, Jussi Raasakka, and Jari Nurmi

Abstract:	Simulation and simulation tools perform an essential role in the research and development of new satellite navigation systems, such as Galileo. Within the Galileo research community there have not been any standardized tools for simulation and the researchers have been forced to build their own proprietary tools to carry out simulations. A tool called GRANADA was developed by Deimos-Space in the GARDA (GAlileo Receiver Development Activities) project and it has become quite popular among the Galileo researchers. GRANADA consists of two complementary tools. The Bit-True GNSS Receiver Simulator is a tool built in the Simulink environment which models the navigation signal processing chain consisting of the transmitter, propagation channel and Galileo receiver blocks. The receiver tool is modular and configurable and it has been successfully used in several documented studies. The other tool in GRANADA is the GNSS Environment and Navigation Simulator but it is out of the scope of this paper. In our project, called GREAT (Galileo REceiver for mAss markeT), we are using GRANADA as one of the implementation and testing platforms for studying multipath mitigation and advanced tracking algorithms. The purpose of this paper is to present the customization work we have done to enhance the GRANADA Bit-True GNSS Receiver Simulator v2.02 to make it more suitable for our needs. In particular we have addressed the issues of repeatability of simulation runs; synchronization between acquisition and tracking units; and modifications to align the simulation results with theoretical ones. We conclude that GRANADA is a tool with high potential for Galileo research and it is becoming more widely used in the Galileo research community. We believe that the steps towards enhancement of usability presented in this paper will also benefit the other researchers who are using the GRANADA tool. This work was carried out under GREAT project, cofunded by the European GNSS Supervisory Authority (GSA) with funding from the 6th Framework Programme of the European Community for research and technological development.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	2707 - 2714
Cite this article:	Hurskainen, Heikki, Hu, Xuan, Ancha, Sireesha, Bell, Graham, Raasakka, Jussi, Nurmi, Jari, "Enhancing Usability of the GRANADA Bit-True Receiver Simulation on Galileo L1," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 2707-2714.
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