Patent ID: 8742984

Claim:
A method of calculating corrections to a navigation solution based on accurate data, comprising: receiving global navigation satellite system (GNSS) ephemeris, clock models and other navigation information from three GNSS satellites; performing pseudo-ranging to the three GNSS satellites; resolving a position, velocity and time (PVT) solution from the GNSS ephemeris, clock models and other navigation information, and the pseudo range measurements, wherein the PVT solution includes a statistical measure, wherein the statistical measure is based on protection levels or integrity risk; receiving differential GNSS data for calculating corrections to the PVT solution and calculating a corrected PVT solution based upon the differential GNSS data; comparing the corrected PVT solution to a region defined by the statistical measure, wherein the region is defined by the protection levels and the comparing comprises comparing of the corrected PVT solution to the region around the PVT solution enclosed by a protection level, or wherein the region is defined by an acceptable integrity risk and the comparing comprises comparing the integrity risk for the PVT solution at an alert limit reduced by the distance between the corrected PVT solution and the PVT solutions with acceptable integrity risk; and rejecting the corrected PVT solution when the corrected PVT solution is not within the region.