Bandwidth Requirements for an Additional Radionavigation Satellite Service Allocation

Kanwaljit S. Sandhoo, Christopher Hegarty, Sally Frodge, A.J. Van Dierendonck, Richard L. Reaser, Edward Drocella

Abstract:	Global Navigation Satellite Systems (GNSS) currently operate in 1215-1260 MHz and 1559-1610 MHz frequency bands. The civil aviation primarily uses1559-1610 MHz band, because this band is protected from interfering emissions by a Radionavigation-satellite Service (RNSS) allocation and more importantly an Aeronautical Radionavigation Service(ARNS) allocation to ensure the safety of passengers and the crew. The 1215-1260 MHz band is protected only by a Radionavigation-satellite Service (RNSS) allocation. Since this band is not protected by ARNS allocation, GNSS signals in this band cannot be relied upon for civil aviation safety-of-life operations. To ensure of the safety of the passengers and the crew,the civil aviation requires another frequency band with ARNS and RNSS allocation. This band is required by the civil aviation to serve as a backup for 1559-1610MHz band and to enhance the GNSS performance for all phases of flight through Category I/II/III precision approach. Currently, GNSS signals are being augmented to meetthe stringent civil aviation requirements for all phasesof flight through Category I/II/III precision approach.To meet these requirements, the Federal AviationAdministration (FAA) of the United States isdeveloping the Wide Area Augmentation System(WAAS) and the Local Area Augmentation System(LAAS). Japan and Europe are also developingaugmentation systems to meet civil aviationrequirements in their regions of the world. Thesesystems correct for errors due to atmosphericactivities, satellite clock, and ephemeris. Thesesystems also utilize the latest advances in technologyto take advantage of the signal power spread over theallocated bandwidth, to minimize tracking errors dueto noise, interference, and multipath. The availabilityof an additional ARNS/RNSS band ensures theachievement of safety margins required to supportcivil aviation safety-of-life operations. It helps inachieving seamless global navigation and sub-meterlevel accuracy needed for scientific and surveyingcommunity. Also, the implementation of a new GNSSsignal structure in this band with higher chipping-rateand more power spread over the bandwidth will makethe satellite-based navigation systems for civilaviation more accurate, reliable and robust. This paper recommends that an additional 24 MHzband (1164-1188 MHz) with ARNS/RNSS allocationis needed to meet civil aviation requirements forsafety-of-life operations. It also points out that anycompromise in bandwidth allocation will underminethe ability of civil aviation administrations around theworld to ensure safety of their passengers and thecrew. Proposed modifications to the GlobalPositioning System (GPS), which is an integral part ofGNSS, are used to demonstrate these points.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	591 - 596
Cite this article:	Sandhoo, Kanwaljit S., Hegarty, Christopher, Frodge, Sally, Van Dierendonck, A.J., Reaser, Richard L., Drocella, Edward, "Bandwidth Requirements for an Additional Radionavigation Satellite Service Allocation," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 591-596.
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