Navigation system for determining the course of a vehicle

G - Physics – 01 – C

Patent

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Details

G01C 21/00 (2006.01) G01C 21/16 (2006.01) B63B 49/00 (2006.01)

Patent

CA 2465233

The invention relates to a navigation system for determining the course of a vehicle. Said navigation system comprises a main sensor system (10) for measuring the status variables describing the vehicle state, an auxiliary sensor system (20) that comprises at least one sensor for measuring an additional status variable, and a navigation core (15) that estimates error- minimized status variables on the basis of the measured status variables. The navigation core (15), in order to achieve a higher generality and robustness with regard to sensor errors of the system, comprises a vehicle model (16) that predicts, on the basis of the measured data of the main sensor system (10), the status variables of the vehicle. The navigation core further includes an error estimator (17) for predicting the errors of estimation made by the vehicle model (16), and a correction element (18) that corrects the predicted status variables by means of the predicted errors of estimation.

L'invention concerne un système de navigation destiné à déterminer la trajectoire d'un véhicule, composé d'un système de capteurs principal (10) destiné à mesurer des variables d'état concernant l'état du véhicule, d'un système de capteurs auxiliaire (20) comportant au moins un capteur destiné à mesurer une variable d'état ultérieure, et d'un noyau de navigation (15) évaluant des variables d'état à erreurs réduites à partir des variables d'état mesurées. L'invention vise à réduire la sensibilité dudit système de navigation par rapport aux erreurs de capteurs. A cet effet, le noyau de navigation (15) contient un modèle de véhicule (16) prévoyant les variables d'état du véhicule à partir des données mesurées par le système de capteurs principal (10), un évaluateur d'erreurs (17) destiné à prévoir les erreurs d'évaluation faites par le modèle de véhicule (16), ainsi qu'un organe de correction (18) corrigeant les grandeurs d'état prévues à partir des erreurs d'évaluation prévues.

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