Automatic vehicle identification system capable of vehicle lane

Details Automatic vehicle identification system capable of vehicle lane Automatic vehicle identification system capable of vehicle lane

1993-02-23

1997-12-23

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

342 44, 342 51, 342454, 342456, 340928, 34082534, 34082554, G01S 1376

Patent

active

057011273

ABSTRACT:
A method of identifying an object and determining in which of at least two areas the object is located is disclosed. The method includes the steps of: focusing a first directional antenna (18) on a first area (28a), focusing a second directional antenna on a second area (28b), transmitting a first field strength pulse (44) from said first directional antenna (18), transmitting a second field strength pulse (46) from said second directional antenna (18), and comparing in a transponder (14) the first field strength pulse (44) to the second field strength pulse (46) to determine in which of the two areas (28a,28b) the transponder (14) is located. Other devices, systems and methods are also disclosed.

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