How Many Satellites are Necessary to Provide APV Everywhere?

Hans L. Trautenberg

Abstract:	The high level integrity allocation of Galileo1 [1] is depicted in Figure 1-1. The non receiver integrity risk is allocated to 3 different contributions. One of the three contributions, the integrity dissemination failure, shall not be discussed here. The remaining two contributions are to be discussed in more detail. These are the fault free or single signal in space failure case on the one hand, and the multiple signal in space failure case on the other hand. The multiple independent signal in space failure case is very unlikely, as the satellites have to fail in the same integrity exposure time due to independent events. The common undetected signal in space monitoring accuracy (SISMA) failure is a property of the monitoring network only. The common undetected signal in space accuracy (SISA) failure reflects one of the common mode failures in the satellite orbit prediction, time scale generation prediction, and signal generation prediction.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	3064 - 3069
Cite this article:	Trautenberg, Hans L., "How Many Satellites are Necessary to Provide APV Everywhere?," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 3064-3069.
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