Vehicle detection systems

Details Vehicle detection systems Vehicle detection systems

1992-04-09

1994-08-16

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Presence detection only

By motion detection

342 61, 342 69, 342456, G01S 1356

Patent

active

053390814

ABSTRACT:
In a vehicle presence detection system for controlling traffic signal lights at a road intersection, the vehicle detection is performed by targeting vehicles at the location of interest with an FMCW radar beam. The radar can be switched repeatedly between the FMCW mode, for vehicle presence detection, and a doppler mode, for vehicle movement detection. Signal data representing the background of the scene viewed by the radar beam are stored for use by circuitry that determines whether an apparent vehicle presence detect is a true vehicle detect; the background signal data is repeatedly updated, as necessary, as the system cycles. Temperature compensation is provided and entry into the FMCW mode is inhibited if a voltage-controlled oscillator provided for generating the emissions has not settled down after any such compensation.

REFERENCES:
patent: 2521683 (1950-09-01), Barker
patent: 2620470 (1952-12-01), Rather, Jr. et al.
patent: 2622140 (1952-12-01), Muller et al.
patent: 3457546 (1969-07-01), Preti
patent: 3531588 (1970-09-01), Kartchner
patent: 3644883 (1972-02-01), Borman et al.
patent: 3697941 (1972-10-01), Christ
patent: 3735335 (1973-05-01), Kaplan et al.
patent: 3836965 (1974-09-01), Preti
patent: 3899671 (1975-08-01), Stover
patent: 3911432 (1975-10-01), Williams
patent: 3932871 (1976-01-01), Foote
patent: 3942178 (1976-03-01), Hackett
patent: 4023017 (1977-05-01), Ceseri
patent: 4025922 (1977-05-01), Trawick, III
patent: 4053887 (1977-10-01), Holford
patent: 4527151 (1985-07-01), Byrne
patent: 4746879 (1988-05-01), Ma et al.
patent: 4866447 (1989-09-01), Loucks
patent: 4991146 (1991-02-01), Ransdell et al.
patent: 5087918 (1992-02-01), May et al.
patent: 5196826 (1993-03-01), Whiting
patent: 5214408 (1993-05-01), Asayama

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