Method and apparatus for electronic surveillance

Details Method and apparatus for electronic surveillance Method and apparatus for electronic surveillance

G - Physics

08

B

343/17

G08B 13/22 (2006.01)

Patent

CA 1134929

ABSTRACT OF THE DISCLOSURE A high frequency generator projects an electronic wave into a surveillance area to establish a first field. At least one control zone is set up within the surveillance area by two low frequency (LF) generators. The first LF generator establishes a second field in the control zone. The second LF generator establishes a third field only at a control zone margin, thereby defining the limits of the control zone. Presence within the control zone of a trans- ponder causes reradiation of a signal comprised of the high frequency and LF signal, which provides an output signal. Additional control zones may be set up within the surveillance area by the addition of further LF generators.

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