Predictive collision sensing system

G - Physics – 01 – S

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G01S 13/93 (2006.01) B60R 21/01 (2006.01) G01S 7/493 (2006.01) G01S 13/02 (2006.01) G01S 13/34 (2006.01) G01S 13/72 (2006.01) G01S 17/93 (2006.01)

Patent

CA 2274716

A relatively narrow beam of either RF or optical electromagnetic radiation is scanned over a relatively wide azimuthal range. The return signal is processed to detect the range and velocity of each point of reflection. Individual targets are identified by clustering analysis (102) and are tracked (106) in a Cartesian coordinate system using a Kalman filter. The threat to the vehicle for a given target is assessed (116) from estimates of the relative distance, velocity, and size of each target, and one or more vehicular devices are controlled (120) responsive to the assessment of threat so as to enhance the safety of the vehicle occupant. In a preferred embodiment, a quantized linear frequency modulated continuous wave RF signal is transmitted from and received by a multi-beam antenna having an azimuthal range of at least +/- 100 degrees and an individual beam width of approximately 10 degrees.

Un faisceau relativement étroit de rayonnement électromagnétique HF ou optique explore une plage azimutale relativement large. Le signal de retour est traité pour détecter la plage et la vitesse de chaque point de réflexion. Chacune des cibles sont fait l'objet d'une identification par une analyse (102) par la théorie des grappes, et d'un suivi (106) dans un système de coordonnées cartésiennes au moyen d'un filtre de Kalman. On évalue (116) les risques concernant le véhicule en fonction d'une cible donnée à partir d'estimations relatives distance - vitesse - taille de chaque cible, et un ou plusieurs véhicules sont commandés (120) en fonction de l'évaluation des risques de façon à améliorer la sécurité de l'occupant du véhicule. Selon une réalisation préférée, un signal HF à onde continue, modulé en fréquence, linéaire, quantifié est transmis et reçu par une antenne multifaisceau dont la plage azimutale est d'au moins 100 degrés et la largeur du faisceau individuel d'approximativement 10 degrés.

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