Positioning With a Software Receiver Under Weak Tracking Conditions With Software Simulated IF-Signals

Roland Kaniuth, Andrea Pósfay, Thomas Pany and Bernd Eissfeller

Abstract:	This paper describes the enhancement of a GNSS receiver suite consisting of a software signal simulator and a software receiver, with regard to signal tracking under weak conditions. The focuses will be on the development of a GPS/GALILEO IF software signal simulator and the navigation algorithms for continuous positioning. The presented algorithms are used for the development of a mass market GPS/GALILEO chipset in a running project. Results of first test cases are presented and further improvements are outlined. The first part of the paper describes briefly the architecture of the recently developed ipexSR (Institute of Geodesy and Navigation PC-based Experimental Software Receiver) software receiver. In the second part of the paper, the IF signal simulator is described. The digital IF signal output of the ADC of a receivers’ front-end is simulated by software only. The IF samples are bit true and the used software architecture provides the possibility to simulate an unlimited number of signals. In the third part of the paper, the navigation algorithm for continuous positioning is described. It is based on a Kalman Filter that determines the user position based on both, pseudo range and code phase measurements. Finally, first test results with the positioning algorithms are presented and future work will be pointed out.
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:	1041 - 1047
Cite this article:	Kaniuth, Roland, Pósfay, Andrea, Pany, Thomas, Eissfeller, Bernd, "Positioning With a Software Receiver Under Weak Tracking Conditions With Software Simulated IF-Signals," 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. 1041-1047.
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