ION Technical Content
G(x)
| Abstract: | Efforts to develop standards to support an international public-use precision approach system based on Differential GNSS are ongoing. The Federal Aviation Administration has been leading the development of a Local Area Augmentation System (LAAS) architecture. It is expected that this architecture will be described to the international community for consideration as a international standard A critical issue related to the development of any LAAS is integrity. A definitive partitioning of the responsibility for the integrity of the operation between the ground system and airborne system is needed so that interoperability between ground equipment provided by different States and airborne equipment made by different manufacturers can be achieved. Furthermore, to minimize the cost of certification and impact on existing airplane designs, the LAAS should provide a service which is as similar as practical to the ILS system it is intended to replace. This implies that the integrity of the LAAS signal-in-space must be guaranteed to levels equivalent to those provided by ILS, and the airborne user cannot assume additional responsibility for detecting failures which have been missed or even induced by the LAAS. Defining the integrity of the signal-in-space has proven to be difficult since the basic differential GNSS process is a cooperative effort between the ground station and airborne equipment. RTCA Special Committee 159 (Working Group 4) has been tasked to work on criteria for a LAAS and is addressing this issue through a tool which has come to be known as the G(x) concept. This paper introduces the G(x) concept and describes how this concept could be used to characterize the LAAS signal- in-space. |
| Published in: |
Proceedings of the 1997 National Technical Meeting of The Institute of Navigation January 14 - 16, 1997 Loews Santa Monica Hotel Santa Monica, CA |
| Pages: | 475 - 483 |
| Cite this article: | Murphy, Tim, DeCleene, Bruce, Skidmore, Trent, "G(x)," Proceedings of the 1997 National Technical Meeting of The Institute of Navigation, Santa Monica, CA, January 1997, pp. 475-483. |
| Full Paper: |
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