| 摘要 |
<p>The invention relates to a method and a device for calibrating the position of a badge reader (2) on board a vehicle, said badge reader (2) being mounted on a portal frame overhanging a travel lane in such a way that it points towards a point on the travel lane located at a predetermined distance (D) from the vertical of the portal frame. The method is characterised in that it comprises the following steps: calculation of an estimate (formula I) of said distance (D) by working out the ratio between a measured average speed (VMi) of the vehicle (Vi) and the time distance between the moment ( ti 1) of detection of the badge of a vehicle (Vi) by said badge reader and the moment of the passage ( ti 2 ) of the vehicle (Vi) directly below the portal frame; and calculation of an average estimate (formula II) of said distance (D) by working out the average of a plurality of thus calculated estimates (formula I) of said distance (D) following the passage of a plurality of vehicles beneath the portal frame.</p> |
