The Generalized Extreme Value statistical method to determine the GNSS integrity performance

For safety of life applications of satellite navigation systems, in e.g. aviation, reliability in the sense of accuracy, availability, continuity and integrity is essential. In order to test the performance with regard to these characteristics a test methodology is required. This methodology should meet the requirement to be able to perform the analysis based on a limited amount of data collected within an acceptable observation time. This paper describes a test method based on the Generalized Extreme Value probability function for analyzing the integrity of receiver output data; the most demanding performance parameter. The method takes into account the fact that generally the probability is not Gaussian distributed at the tail which turns out to be essential in order to estimate the correct integrity performance result.