Patent ID: 8564480
Filing Date: 2013-10-22
Classification: G01S

Abstract:
1. A system for augmenting a performance of a satellite geolocation system including at least one satellite and at least one positioning receiver, the satellite geolocation system being defined by a nominal operating range, the satellite geolocation system comprising: at least one system for measuring signals transmitted by said satellite geolocation system, a processing centre receiving the signals transmitted by the at least one system and producing anomaly correction or alert messages concerning unavailability of said satellite geolocation system to said at least one positioning receiver, and terrestrial or satellite means for broadcasting said correction or alert messages to said at least one positioning receiver, wherein the correction or alert messages comprise a behaviour model of at least one of the satellites of said satellite geolocation system, the behaviour model incorporating parameters with which to augment the nominal operating range of said satellite geolocation system, and an indicator of a deviation between said behaviour model and a real behaviour of said at least one satellite, to enable the at least one positioning receiver to continue to use said at least one satellite to determine the position of the at least one positioning receiver using the behaviour model outside of the nominal operating range of the satellite geolocation system, said parameters of the behaviour model comprising a model of distortion of code chips transmitted by said at least one satellite to said at least one positioning receiver, or a model of distortion of a phase of the signals transmitted by said at least one satellite to said at least one positioning receiver.