Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1997-10-06
2000-01-04
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342454, 342461, 340936, 701119, G01S 302
Patent
active
060115157
ABSTRACT:
A vehicular traffic sensor capable of measuring traffic speed and volume in all weather conditions and at a low installed cost. The sensor makes use of multi-path interference of ambient radio frequency (RF) signals. The ambient RF signals can be, for example, control signals constantly transmitted by cellular telephone base stations. As vehicles travel along the roadway, they reflect RF signals in all directions. An antenna mounted near the side of the road will detect signals from the transmitter and signals reflected off the vehicle. Variations in the amplitude of the combination of the two signals can be processed using a method that allows the sensor to determine traffic speed and volume. This information can then be sent directly to a traffic management center. This provides an inexpensive sensor for wide-area traffic monitoring.
REFERENCES:
patent: 4258351 (1981-03-01), Shigeta et al.
patent: 4985705 (1991-01-01), Stammler
patent: 5402117 (1995-03-01), Zijderhand
patent: 5402346 (1995-03-01), Lion et al.
patent: 5764163 (1998-06-01), Waldman et al.
Holm Eric D.
Radcliffe Scott T.
Krivak Carla Magda
Pawlikowski Eugene J.
Phan Dao L.
Tarcza Thomas H.
The Johns Hopkins University
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