Impact of Constellation Health on ADS-B Service Availability

Matt Harris, Dean Miller and Tim Murphy

Abstract:	Standards and Requirements for Automatic Dependent Surveillance – Broadcast (ADS-B) continue to evolve. Some states have already begun to implement new operational capabilities based on the use of ADS-B. For example, ADS-B has enabled more efficient routing for some operators in the Hudson Bay area. Several states have announced mandates for ADS-B equipage starting as early as 2012. Unfortunately, the performance requirements associated with these mandates vary by region and intended operational use. Some operational concepts require that when an ADS-B service outage is experienced, the airspace transitions from separation based on surveillance to procedural separation. Consequently, service reliability is of great interest. This paper explores the practical limitations on ADS-B service when GPS alone is used as the source of positioning. The paper considers the frequency and duration of ADS-B service outages given the current constellation and assuming various degraded constellation scenarios. The study also considers several RAIM types and shows the relative performance of each. This study should be of interest to any Aeronautical Navigation Service Provider (ANSP) involved in ADS-B developments as it highlights some practical limitations of ADS-B. This is particularly relevant in areas of the world not serviced by SBAS or where no other augmentation system or conventional navigation system is available to support an ADS-B application.
Published in:	Proceedings of the 2010 International Technical Meeting of The Institute of Navigation January 25 - 27, 2010 Catamaran Resort Hotel San Diego, CA
Pages:	329 - 343
Cite this article:	Harris, Matt, Miller, Dean, Murphy, Tim, "Impact of Constellation Health on ADS-B Service Availability," Proceedings of the 2010 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2010, pp. 329-343.
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