Enabling LAAS Airport Surface Movement: Mitigating the Anomalous Ionospheric Threat

Y.S. Park, S. Pullen, P. Enge

Abstract:	The Local Area Augmentation System (LAAS) can be used for both precision approach and Differentially Corrected Positioning Service (DCPS) applications. Through its support of DCPS, the LAAS Ground Facility (LGF) is required to meet the integrity requirements of all other operations that could use the LAAS VHF Data Broadcast (VDB). Our previous work [1,2,3] demonstrated that the existing DCPS integrity requirements cannot be met by CAT I LAAS without changes to both the definition of DCPS integrity [4,5] and the airborne receiver requirements [6]. One of the implications is that some future applications of LAAS that planned to use DCPS, such as airport surface movement, cannot be supported by DCPS with the CAT I LAAS architecture. However, if airport surface movement is defined as a separate operation, it could be supported by the existing LGF geometry screening that mitigates the anomalous ionospheric threat for CAT I precision approach. The only change needed would be to increase ?pr_air in airborne equipment to bound the higher multipath errors in the airport surface environment. Confirming this hypothesis requires a moreintensive study of the requirements of airport surface movement and is the subject of this paper. If LGF geometry screening itself cannot support airport surface movement, the results in this paper include additional aircraft geometry screening proposed in [2] to lower the Maximum Acceptable Error (MAE) to a usable level while maintaining useful availability.
Published in:	Proceedings of IEEE/ION PLANS 2010 May 4 - 6, 2010 Renaissance Esmeralda Resort & Spa Indian Wells, CA
Pages:	667 - 679
Cite this article:	Park, Y.S., Pullen, S., Enge, P., "Enabling LAAS Airport Surface Movement: Mitigating the Anomalous Ionospheric Threat," Proceedings of IEEE/ION PLANS 2010, Indian Wells, CA, May 2010, pp. 667-679. https://doi.org/10.1109/PLANS.2010.5507219
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