FIELD: radio engineering, communication.
SUBSTANCE: method of determining navigation parameters for a carrier by a hybridisation device comprising a Kalman filter (3) forming a hybrid navigation solution on the basis of inertial measurements calculated by a virtual platform (2) and of raw measurements of signals emitted by a constellation of satellites delivered by a satellite positioning system (GNSS), characterised by that it comprises steps of determination, for each satellite, of at least one likelihood ratio (Ir, Ir′) between a hypothesis regarding a fault of a given nature of the satellite and a hypothesis regarding an absence of fault of the satellite, declaration of a fault of a given nature on a satellite based on a function of the likelihood ratio (Ir, Ir′) associated with that fault and a threshold value, estimation of the impact of the declared fault on the hybrid navigation solution, and correction of the hybrid navigation solution according to the function of the estimation of the impact of the declared fault.
EFFECT: reducing, in case of a fault in a satellite, the safety radius around a calculated position which limits the error in determining the true position in accordance with a given risk level for integrity, which determines the degree of integrity of the system.
14 cl, 1 dwg
