GPS IIF and Modernization Taking the Most Advantage of GPS IIF Flexibility

Peter Fyfe, Kamran Ghassemi, Douglas Thompson and Eric Watts

Abstract:	The Block IIF contract called for a Space Vehicle that would provide for flexibility and growth. Now after five years, launch vehicle changes, and GPS modernization, the Block IIF SV design is still ready to meet the call. The original spacecraft bus design flexibility has allowed Boeing to provide a modernized signal-in-space (SIS) and meet new civil requirements. Our navigation payload provides the necessary flexibility to generate and transmit the presently defined signals, yet allow changes to the SIS even while on orbit in the event that the signal definition needs to be changed. In addition to providing for new military requirements, the modernized IIF will begin a new era in civil navigation services with L5 and additional civil signal on L2. Performance and operational enhancements of the original IIF system will be carried over to these new services. This paper will describe changes to the GPS IIF architecture, new navigation services that will be offered and associated performance predictions. In addition, flexibility features being designed in for growth, as well as to reduce risk of future requirement growth, are highlighted.
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:	641 - 649
Cite this article:	Fyfe, Peter, Ghassemi, Kamran, Thompson, Douglas, Watts, Eric, "GPS IIF and Modernization Taking the Most Advantage of GPS IIF Flexibility," 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. 641-649.
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