GPS RAIM: Statistics Based Improvement on the Calculation of Threshold and Horizontal Protection Radius
نویسندگان
چکیده
RAIM (Receiver Autonomous Integrity Monitoring) technology has been developing around its two tasks (or functions). One is to detect whether there is a satellite failure. The other is to determine whether the spatial geometry of the satellites satisfies the navigational precision, pertinent to Horizontal Protection Level (HPL). This paper continues the use of the method for detecting satellite failure using statistics. Differently, it proposes a new method for calculating HPL totally based on statistics, in contrast with the former methods based on the worst-case condition or bad geometries. Its advantage is to maintain the stochastic performance indices perfectly, meanwhile to raise the availability of GPS.
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