05701127 is referenced by 140 patents and cites 19 patents.

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.

Title
Automatic vehicle identification system capable of vehicle lane discrimination
Application Number
8/21123
Publication Number
5701127
Application Date
February 23, 1993
Publication Date
December 23, 1997
Inventor
Claude Andrew Sharpe
McKinney
TX, US
Agent
Richard L Donaldson
James C Kesterson
Rebecca A Mapstone
Assignee
Texas Instruments Incorporated
TX, US
IPC
G01S 13/76
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