Architecture and Implementation of a Universal Real-Time GNSS Signal Simulator

Rui Li, Dazhi Zeng, Teng Long, Lei Zhang

Abstract:	This paper presents flexible and scalable architecture of the universal real-time GNSS signal simulator which has the capability of multi-user, multi-constellation and multifrequency joint simulation. The simulator employs the network-topology framework and the architecture based on modular design includes three sub-systems: the software modeling sub-system, the GNSS RF signal generation sub-system and the interference generation sub-system. Each sub-system can run independently. The GNSS RF signal generation sub-system is a complicated part in the whole system and the implementation of this sub-system is to be considered seriously. The GNSS RF signal generation sub-system is composed of four modules, including the system clock generator, the controller, the signal generation modules and the RF module. An implementation based on the “CPU + DSP + FPGA + DAC + Analog Front-End” structure is introduced in this paper. Finally, a prototype of the universal real-time GNSS signal generator developed by Beijing Institute of Technology is exhibited.
Published in:	Proceedings of the 2010 International Technical Meeting of The Institute of Navigation January 25 - 27, 2010 Catamaran Resort Hotel San Diego, CA
Pages:	1037 - 1043
Cite this article:	Li, Rui, Zeng, Dazhi, Long, Teng, Zhang, Lei, "Architecture and Implementation of a Universal Real-Time GNSS Signal Simulator," Proceedings of the 2010 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2010, pp. 1037-1043.
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