GPS/GLONASS Time Difference Measurements and Test Bed Development

Benjamin Peterson, Eric Chamberlin, and Terry Vogler, Peter Daly and Stuart Riley

Abstract:	A joint U. S. Coast Guard Academy/University of Leeds GPS/GLONASS effort is described. The objectives of this effort are: 1. To obtain independent measurements of GLONASS 41s. GPS time at the Coast Guard Academy to complement the ongoing work at Leeds and thus establish a dual baseline on GPS/GLONASS time references 2. To develop a general purpose signal and interference analysis test bed for educational purposes and for studying the effects of interference and jamming on user receivers. The test bed is based on the Hewlett Packard 89440A Vector Signal Analyzer system. For signal analysis and time measurements, the RF signal from an active antenna is bandlimited to 7 MHz bandwidth, down- converted to 6 MHz and digitized at 25.6 MHz. For making Time of Arrival (TOA) measurements, time domain templates of the GPS/GLONASS C/A pseudorandom code sequences are calculated off-line and stored in the analyzer. The system is Cesium referenced and calculates the cross correlation and Doppler shift of the satellite signals. Establishing a dual baseline on the GPS/GLONASS time reference will greatly enhance any possible integration of the two systems in the future. Additionally the system is an ideal platform for teaching GPS/GLONASS and for allowing to students perform their own signal analysis due to the ease in applying any common DSP algorithm fo the down-converted/sampled RF.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	305 - 312
Cite this article:	Peterson, Benjamin, Chamberlin, Eric, Vogler, Terry, Daly, Peter, Riley, Stuart, "GPS/GLONASS Time Difference Measurements and Test Bed Development," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 305-312.
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