Reconfigurable Dual Frequency Software GPS Receiver and Applications

Aleksandar Jovancevic, Andrew Brown, Suman Ganguly, Michael Kirchner, Slavisa Zigic, Logan Scott and Phillip Ward

Abstract:	The Global Positioning System is being used for a growing variety of diverse applications. All these applications have somewhat different requirements in terms of the receiver functionality. Although the core design is similar, the final development must be done separately. There is a need for unified platform that will allow receiver development and testing for various applications, thus speeding the design process and reducing its cost. Such a platform would need to have an open architecture and design flexibility so that modifications and testing can be done quickly and efficiently. The objective of this paper is to present the structure of reconfigurable dual frequency software GPS receiver. The receiver consists of a hardware front end responsible for downconverting the signal to a suitable IF and sampling it. The signal samples are processed in real time using a software digital receiver or stored for later processing. The software digital receiver is implemented using modules that are easily configurable through a user- friendly graphical user interface. The correlator can be implemented either completely in software or using FPGA for real time processing. A variety of software modules are available for advanced signal processing. Several GPS architectures using these modules have been implemented including scintillation mitigation, anti- jamming, and multipath mitigation to name a few. Both single antenna and space-time adaptive processing type solutions are used for multipath mitigation. Some of the results for specialized applications are presented. The software implementation of processing modules makes this system a truly versatile GPS receiver suitable for numerous specialized applications.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	2888 - 2899
Cite this article:	Jovancevic, Aleksandar, Brown, Andrew, Ganguly, Suman, Kirchner, Michael, Zigic, Slavisa, Scott, Logan, Ward, Phillip, "Reconfigurable Dual Frequency Software GPS Receiver and Applications," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 2888-2899.
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