Cross correlated doppler radar/infra red velocity and presence s

Details Cross correlated doppler radar/infra red velocity and presence s Cross correlated doppler radar/infra red velocity and presence s

1979-07-20

1982-02-23

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 8, G01S 1386

Patent

active

043171176

ABSTRACT:
A doppler radar and infra red sensor focused by common means onto a region, will, with appropriate cross correlation, provide improved velocity and presence sensing in a complex uncontrolled environment. The illustrative overhead, roadside traffic sensor employs a common microwave/infra red parabolic reflector and illuminating feed. The sensor can be conveniently mounted onto utility poles without cutting up the road or hanging overhead arbors. The velocity and presence data it provides can be used to determine vehicular headway, density, volume, vehicle size, aggregate momentum, aggregate congestion, platoon arrival, queue length, etc. This novel sensor reduces spurious indications, permits oblique angle viewing of vehicles, reduces doppler transmitter power levels so as to be well below normally accepted environmentally safe levels, and discriminates against vehicles moving in the wrong direction. The improved information will make possible better adaptive traffic signal timing methods to reduce fuel consumption and auto emissions. An additional feature provided by this sensor is that it detects emergency and mass transit vehicles to expedite their safe movement.

REFERENCES:
patent: 3195126 (1965-07-01), Barker
H. A. Geller et al.; A Data Acquisition System for Unobtrusive Measurement of On-Road Driving Behaviour; Behaviour Research Methods and Instrumentation; Nov. 1975; vol. 7, No. 6, pp. 526-530.

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