Transponder detection system for vehicles in toll collection...

Details Transponder detection system for vehicles in toll collection... Transponder detection system for vehicles in toll collection...

G - Physics

01

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G01S 13/74 (2006.01) E01F 13/00 (2006.01) G01S 13/87 (2006.01) G08G 1/00 (2006.01) G01S 13/44 (2006.01) G01S 13/91 (2006.01) G07B 15/00 (2006.01)

Patent

CA 2164031

A transponder detection system (50) for detecting the presence at a detection zone such as a vehicle toll collection lane (22) of a vehicle (100) on which a transponder (3) is mounted. Two antenna arrays (32, 34) are located on opposite sides of the detection zone (22), and have their boresights (B) directed to the detection area. For each array, a sum and difference signal of signals received from the transponder are measured. The sum channel signal is used to establish whether a transmission has occurred, and the difference channel signal is used to isolate any transponder that is at the detection zone.

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