Issues in Sharing and Encroachment: A Hierarchical Approach to Like-system Spectrum Sharing

Steven Lazar, Srini Raghavan and David Turner

Abstract:	Lately, there has been unparalleled interest in sharing the radio-frequency bands used by radionavigation satellite services (RNSS). The scarcity and thus the demand for Lband spectrum are self-evident. The simultaneous efforts at making frequencies currently reserved (primarily) for radio navigation satellite services (RNSS) available for numerous other services and the growth of systems to augment and possibly complement GPS raise perplexing issues in spectrum management. On one hand, there is a need to validate through technical analysis the assertion that frequencies used for navigation in services that include public safety should remain clear of competing and possibly interfering systems. On the other hand, those same safety services cannot uniquely reserve these frequencies, and can be shown to benefit from accommodating other like-kind systems. Nevertheless, precedents that have been set in the management of GPS spectrum, and the possibility of sharing the band with other registered services have been misinterpreted as an invitation for unrelated services to also seek allocations overlapping the RNSS spectrum. This paper will discuss the distinctions between sharing among the like-kind (and hopefully complementary) systems and encroachment by unrelated and potentially harmful systems and also the recommended methods to determine whether sharing is possible.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	973 - 980
Cite this article:	Lazar, Steven, Raghavan, Srini, Turner, David, "Issues in Sharing and Encroachment: A Hierarchical Approach to Like-system Spectrum Sharing," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 973-980.
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