Validation of GPS L5 Coexistence with DME/TACAN and Link-16 Systems

T. Kim, J. Grabowski

Abstract:	In 1999, the Interagency GPS Executive Board (IGEB) endorsed a set of recommendations on implementing the third civil GPS frequency (L5) within the United States to ensure that it can coexist with government systems operating within and adjacent to the L5 frequency. These recommendations were based on analyses that pulse blanking is used in GPS L5 user equipment receiving at least -154 dBW level power from each GPS satellite. In 2002, it was announced that early Block IIF satellites to be launched from 2006 will provide the minimum L5 received signal power at the reduced level of -154.9 dBW. The reduction of minimum L5 received power and the conservatism in the previous assessment of the worst case interference aggregate duty cycle made it imperative to revisit the GPS L5 coexistence validation [2-6] with DME/TACAN and military Link-16 systems that share the spectrum with L5. This paper provides both analytical simulation and GPS L5 prototype hardware test results to assess the coexistence of GPS L5 user equipments with DME/TACAN and Link-16 systems in original and reduced minimum L5 received power levels. In modeling the L5 receiver performance, a queuing analysis was used to account for the DME/TACAN and Link-16 interference pulse collision that reduces the aggregate pulse blanking duty cycle. The noise contribution effect of post-blanking residual pulses that mix with weak interfering pulses below the pulse blanking threshold was also investigated.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1455 - 1469
Cite this article:	Kim, T., Grabowski, J., "Validation of GPS L5 Coexistence with DME/TACAN and Link-16 Systems," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1455-1469.
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