CA2220216A1 - Automatic determination of traffic signal preemption using differential gps - Google Patents

Automatic determination of traffic signal preemption using differential gps

Info

Publication number
CA2220216A1
CA2220216A1 CA002220216A CA2220216A CA2220216A1 CA 2220216 A1 CA2220216 A1 CA 2220216A1 CA 002220216 A CA002220216 A CA 002220216A CA 2220216 A CA2220216 A CA 2220216A CA 2220216 A1 CA2220216 A1 CA 2220216A1
Authority
CA
Canada
Prior art keywords
intersection
gps
vehicle
measurements
preemption
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002220216A
Other languages
French (fr)
Other versions
CA2220216C (en
Inventor
Gary V. Jones
Ronald R. Hatch
James R. Hume
Richard G. Keegan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Global Traffic Technologies LLC
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2220216A1 publication Critical patent/CA2220216A1/en
Application granted granted Critical
Publication of CA2220216C publication Critical patent/CA2220216C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/087—Override of traffic control, e.g. by signal transmitted by an emergency vehicle
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/40—Correcting position, velocity or attitude
    • G01S19/41—Differential correction, e.g. DGPS [differential GPS]

Abstract

A traffic signal preemption system, and a related method for its use, using differential global positioning system (GPS) measurements for accurate monitoring of the position, speed and direction of an emergency or service vehicle approaching a controlled intersection. The preemption system includes a reference GPS receiver, for computing GPS measurement corrections, and a GPS receiver in each vehicle, which transmits its GPS
measure-ments by radio to a receiver located at the controlled intersec-tion. A computer also located at the intersection uses corrected vehicles position, and speed and direction measurements, in con-junction with previously recorded data defining approach routes to the intersection, to determine the optimum time to switch a traffic light controller to preemption mode to permit safe passage of the vehicle. GPS measurement corrections may be applied in a vehicle computer or in the computer located at the intersection.
Other modes of operation of the system include a self-survey mode, whereby the reference GPS receiver determines its own true position by averaging position measurements over a period of a day or two, and a learn mode, whereby the intersection com-puter "learns" unusual approach routes to the intersection as the vehicle traverses the approach routes and transmits position and velocity measurements.
CA002220216A 1995-05-05 1996-04-23 Automatic determination of traffic signal preemption using differential gps Expired - Lifetime CA2220216C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/435,523 US5926113A (en) 1995-05-05 1995-05-05 Automatic determination of traffic signal preemption using differential GPS
US08/435,523 1995-05-05
PCT/US1996/005668 WO1996035197A1 (en) 1995-05-05 1996-04-23 Automatic determination of traffic signal preemption using differential gps

Publications (2)

Publication Number Publication Date
CA2220216A1 true CA2220216A1 (en) 1996-11-07
CA2220216C CA2220216C (en) 2008-07-29

Family

ID=23728742

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002220216A Expired - Lifetime CA2220216C (en) 1995-05-05 1996-04-23 Automatic determination of traffic signal preemption using differential gps

Country Status (8)

Country Link
US (3) US5926113A (en)
EP (1) EP0826205B1 (en)
AT (1) ATE233423T1 (en)
AU (1) AU714247B2 (en)
CA (1) CA2220216C (en)
DE (1) DE69626390T2 (en)
ES (1) ES2190468T3 (en)
WO (1) WO1996035197A1 (en)

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US5986575A (en) 1999-11-16

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