Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-03-16
1993-09-28
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
180167, 340988, 356 4, G01C 300, B60T 716, G08G 1123
Patent
active
052490270
ABSTRACT:
A system of active emitters and sensors is provided for measuring distance and communicating between vehicles on an automated highway. The preferred system utilizes a pair of spaced apart sensors at the front of each vehicle for stereo depth perception, two temporally modulated emitters on the rear of each vehicle for redundancy and inter-vehicle communication, and temporally modulated emitters positioned at intervals along the highway for communication from the highway to the vehicles. The emitters may transmit radiation at a wavelength, such as 1 .mu.m IR, for example, that can be detected by low cost detectors. The emitters are modulated temporally to transmit a binary code, resulting in signal-to-noise improvement and increased clutter rejection and operational range. Each sensor may include an array of IR detectors and associated readout circuitry, an imaging lens, a lens array for improving detector fill factor, a filter and polarizer to reject clutter and reduce noise, and a cylindrical lens to provide a good vertical field of view. Detector charge integration is controlled by the binary code of the emitters and depends on the code length and local background illumination. The sensors are connected to a computer processor for processing data received from the emitters and computing distance between vehicles.
REFERENCES:
patent: 3152317 (1964-10-01), Mayer
patent: 3340763 (1967-09-01), Power
patent: 3892483 (1975-07-01), Saufferer
patent: 4934477 (1990-06-01), Dai
patent: 5164732 (1992-11-01), Brockelsby
patent: 5166533 (1992-11-01), Kajiwara
Mathur Bimal P.
Wang H. Taichi
Buczinski Stephen C.
McFarren John C.
Rockwell International Corporation
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