Automatic vehicle identification system capable of vehicle lane discrimination
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United States of America Patent
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Dec 23, 1997
Grant Date -
N/A
app pub date -
Feb 23, 1993
filing date -
Feb 23, 1993
priority date (Note) -
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status (Latency Note)
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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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