×

Toll collection system and its communication method

  • US 20010019307A1
  • Filed: 02/27/2001
  • Published: 09/06/2001
  • Est. Priority Date: 02/28/2000
  • Status: Active Grant
First Claim
Patent Images

1. A toll collection system communication method which charges a car passing through a communication area in a tollgate without a stop, by radio communication between a roadside antenna in the tollgate and an antenna mounted in the car, the method comprising the steps of:

  • detecting a car passing through the communication area and a detection area including a given area just before the communication area to obtain the car position data;

    calculating, when a car is present in the communication area, a plurality of electromagnetic wave beam paths of direct and reflected waves which connect the roadside antenna and the vehicle-mounted antenna in the car in the position (hereinafter the a plurality of electromagnetic wave beam paths are referred to as “

    wave paths”

    );

    selecting the radiation direction of the radio path whose communication sensitivity is the highest among the wave paths as radiation direction 1; and

    adjusting so as to have the directional pattern of the roadside antenna directed toward the radiation direction 1.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×