Short range position locating system for transponder

Details Short range position locating system for transponder Short range position locating system for transponder

1998-03-06

2000-02-15

Tarcza, Thomas H.

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

Directive

Including a steerable array

342373, 342457, 455 20, H01Q 302

Patent

active

060257997

ABSTRACT:
In order to locate a transponder in a roadway there are first and second antenna arrays at spaced locations. Each array is associated with a switching control which causes the array beam to step through a series of beams. The signal developed in each beam is converted to a digital result. The strongest beam from each array may be determined and the location of the transponder at the intersection of the two strongest beams.

REFERENCES:
patent: 3860928 (1975-01-01), Ehrlich
patent: 4257050 (1981-03-01), Ploussios
patent: 4477812 (1984-10-01), Frisbee et al.
patent: 4881078 (1989-11-01), Yamane et al.
patent: 5257031 (1993-10-01), Scarpetta et al.
patent: 5537122 (1996-07-01), Eguchi
patent: 5697052 (1997-12-01), Treatch

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