Patent ID: 8508405
Filing Date: 2013-08-13
Classification: G01S

Abstract:
1. A method of processing radionavigation receiver signals, the method comprising: providing, at an equipment with a Receiver Autonomous Integrity Monitoring (RAIM) functionality, measurements of pseudo-ranges between a plurality of satellites and a primary radionavigation receiver; providing, at the equipment, a geographical position and a clock shift of the primary radionavigation receiver; calculating, at the equipment, residuals of measurements of pseudo-ranqes obtained on the basis of the geographical position and the clock shift provided by said primary radionavigation receiver and on the basis of measurements of pseudo-ranges provided by said primary radionavigation receiver, said residuals being denoted by Yi, where i is an index of a satellite i in the plurality of satellites; forming, at the equipment, subsets of the residuals of a cardinal denoted by h=N−1 and/or N−2, N being the number of said residuals; calculating, at the equipment, a standard deviation of each subset with σ determining, at the equipment, a minimum value h for each satellite i, calculating, at the equipment, a first vector of residuals defined by: for the plurality of satellites, sorting, at the equipment, elements of the first vector r calculating, at the equipment, a factor f defined by:  where (χ weighting at the equipment, said σ for each said satellite, calculating, at the equipment, a new vector of residuals defined by: defining, at the equipment, a threshold T such that: T=(χ comparing, at the equipment, each element of the new vector of residuals r