Device for monitoring the integrity of information delivered...

G - Physics – 01 – S

Patent

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Details

G01S 5/14 (2006.01) G01C 21/16 (2006.01)

Patent

CA 2545870

The invention relates to a device for monitoring the integrity of position- and speed-related information supplied by a hybrid system comprising an inertial unit INS (1) which is reset with the aid of a GNSS satellite positioning receiver (2) by means of a Kalman hybridisation filter (3) using a reset gain K and an evolution matrix F. The inventive device includes a satellite problem-detector circuit (4) comprising: a predictor/estimator filter bank (40i) which uses gain K and evolution matrix F of the Kalman hybridisation filter (3), each filter observing the deviation between (i) the positioning point which is obtained from N visible satellites, in the form of geographical co-ordinates, and which is delivered by the GNSS receiver (2) and (ii) one of the positioning points P(N-1)/i, also in the form of geographical co-ordinates, which are delivered by the same GNSS receiver (2) and which are obtained using N-1 of N visible satellites for resolution; and test circuits (41i) which compare the states of the predictor/estimator filters (40i) to the variances thereof and which detect a satellite failure when a test is positive, said deviation being greater than a detection threshold.

Le dispositif est destiné à la surveillance de l'intégrité des informations de position et de vitesse fournies par un système hybride composé d'une centrale inertielle INS (1) recalée à l'aide d'un récepteur de positionnement par satellites GNSS (2) au moyen d'un filtre de Kalman d'hybridation (3) utilisant un gain de recalage K et une matrice d'évolution F. Il comporte un circuit (4) détecteur de problème satellite comportant un banc de filtres prédicteurs-estimateurs (40¿i?) utilisant le gain K et la matrice d'évolution F du filtre de Kalman d'hybridation (3), observant chacun l'écart entre le point de positionnement obtenu à partir des N satellites visibles, en coordonnées géographiques, délivré par le récepteur GNSS (2) et l'un des points de positionnement P¿(N-1)/i?, également en coordonnées géographiques, délivrés par ce même récepteur GNSS (2) obtenu en utilisant N-1 des N satellites visibles pour la résolution, et des circuits de test (41¿i?) comparant les états des filtres prédicteurs-estimateurs (40¿i?) à leurs variances et détectant une panne satellite lorsqu'un test est positif, l'écart trouvé étant supérieur à un seuil de détection.

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