Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1992-07-22
1993-07-13
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342456, 342 51, 342156, G01S 504
Patent
active
052278034
ABSTRACT:
A transponder location and tracking system having a phased array antenna mounted at a toll collection station includes a plurality of antenna array elements for receiving a signal from a transponder mounted on a vehicle and for providing a plurality of antenna element electrical signals. A plurality of phase detectors are provided for comparing the phase of the electrical signals to provide a plurality of phase difference signals. A plurality of angle-of-arrival calculation processors is provided for converting the phase difference signals to spatial signals to define the angles-of-arrival of the vehicle transponder signal. A position calculation processor is included for providing an output signal representative of the location of the vehicle in response to the defined angles-of-arrival. In a preferred embodiment, the transponder location and tracking system includes a plurality of receiver processing devices for amplifying and filtering the electrical signals from each antenna element. The phase detectors then compare the phase of the electrical signals to a reference element signal. Each phase detector provides a digital representation of the phase difference signals. The spatial signals represent the angle-of-arrival of the vehicle transponder signal. The position calculation processor operates on the spatial signal to determine the vehicle transponder position. A tracking mechanism is provided to plot the location of a moving vehicle along the roadway.
REFERENCES:
patent: 3914762 (1975-10-01), Klensch
patent: 4123754 (1978-10-01), Armstrong
patent: 4303904 (1981-12-01), Chasek
Nishida Michael Y.
O'Connor Roger J.
Shloss Peter D.
Blum Theodore M.
Denson-Low Wanda K.
Hughes Aircraft Company
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