Two-antenna positioning system

Details Two-antenna positioning system Two-antenna positioning system

H - Electricity

04

B

H04B 7/185 (2006.01) G01S 5/02 (2006.01)

Patent

CA 2373954

Two GPS units (18, 20) are mounted at two separate points on the body (12) of a work machine (10) to periodically measure their three-dimensional coordinates with respect to a chosen reference system. A plane is fitted through four points so collected and it is used to determine the current orientation of the machine. As each additional set of position data is collected at predetermined intervals for the two points on the machine, a new plane equation is calculated to update the orientation of the machine based on a predetermined number of prior measurements. Standard-deviation analysis is used to check the validity of each plane calculation. Based on the current coordinates of the two GPS antennas, the current orientation plane so calculated, and the known geometry of the work machine, the current position of its critical components (14, 16) can be determined as well.

Deux unités GPS (18, 20) sont montées en deux points distincts de la carrosserie (12) d'un engin de chantier (10) de façon à mesurer périodiquement leurs coordonnées tridimensionnelles par rapport à un système de références choisi. Un plan passant par quatre points recueillis par ce dispositif permet de déterminer l'orientation courante de l'engin. Au fur et à mesure de l'arrivée périodique des ensembles supplémentaires de données de position, on calcule une nouvelle équation plane venant mettre à jour l'orientation de la machine sur la base d'un nombre défini de mesures antérieures. Une analyse par écarts standards permet de confirmer la validité de chaque calcul de plan. En se basant sur les coordonnées courantes des deux antennes GPS, sur le plan d'orientation courant ainsi calculé, et sur la géométrie connue de l'engin de chantier, il est possible également de calculer la position courante de ses composants critiques (14, 16).

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