Lm and Lc: How the Military and Civilian Users of GPS Can Reuse Our Existing Spectrum

Jon Anderson, Steve Lazar

Abstract:	GPS has become the critical sensor for both military and civil applications. The limitations of the current civil service have resulted in a reevaluation of the fundamental signal structure of GPS. The primary changes that have been considered are setting Selective Availability to zero and adding a second civil frequency. The failed L5 process for identifying a new civil frequency and the improbability of finding a new military band has highlighted the scarcity of frequency spectrum for navigation satellite use. The authors are proposing an alternative approach called the Frequency Reuse concept. This approach allows the U.S. to simultaneously meet national and international civil and military needs. This paper describes the process to develop the technical requirements and outlines the GPS Joint Program Office Advanced Signal Development Plan. The assumptions and criteria used to satisfy the Presidential Decision Directive for the future of GPS using the currently registered frequency bands is presented herein.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	1229 - 1235
Cite this article:	Anderson, Jon, Lazar, Steve, "Lm and Lc: How the Military and Civilian Users of GPS Can Reuse Our Existing Spectrum," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 1229-1235.
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