Hybrid APNT: Terrestrial Radionavigation to Support Future Aviation Needs

Sherman Lo, Yu-Hsuan Chen and Per Enge

Abstract:	The Federal Aviation Administration (FAA) Alternative Positioning Navigation & Timing (APNT) program is developing and examining solutions to provide terrestrial based radio-navigation capability that can support Next Generation Air Transportation System (NextGen) even with the loss of GNSS. Two technologies being examined are improved distance measuring equipment (DME) and passive ranging from DME and automatic dependent surveillance broadcast (ADS-B) ground stations. This paper details the concept and operation of Hybrid APNT which combines these two options to form a solution that contains the best features of each option. Hybrid APNT combines true and passive ranging transmissions, particularly from the same source, to allow for the integrated use of DME and ADS-B ground stations and improve key performance areas. The combination of these ranging sources from the same ground station enables synchronization of aircraft clock with the ground and allows for interchangeable use of true and passive ranges. The combination helps address two key performance issues: coverage and capacity.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	3029 - 3039
Cite this article:	Lo, Sherman, Chen, Yu-Hsuan, Enge, Per, "Hybrid APNT: Terrestrial Radionavigation to Support Future Aviation Needs," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 3029-3039.
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