CA2184549A1 - Method and Apparatus for Calibration of a Distance Sensor in a Vehicle Navigation System - Google Patents

Method and Apparatus for Calibration of a Distance Sensor in a Vehicle Navigation System

Info

Publication number
CA2184549A1
CA2184549A1 CA2184549A CA2184549A CA2184549A1 CA 2184549 A1 CA2184549 A1 CA 2184549A1 CA 2184549 A CA2184549 A CA 2184549A CA 2184549 A CA2184549 A CA 2184549A CA 2184549 A1 CA2184549 A1 CA 2184549A1
Authority
CA
Canada
Prior art keywords
odometer
navigation system
vehicle navigation
difference
pulse rate
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
CA2184549A
Other languages
French (fr)
Other versions
CA2184549C (en
Inventor
Hidekazu Oshizawa
Toshikazu Sakakibara
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.)
Visteon Technologies LLC
Original Assignee
Zexel Corp
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 Zexel Corp filed Critical Zexel Corp
Publication of CA2184549A1 publication Critical patent/CA2184549A1/en
Application granted granted Critical
Publication of CA2184549C publication Critical patent/CA2184549C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/28—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network with correlation of data from several navigational instruments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C22/00—Measuring distance traversed on the ground by vehicles, persons, animals or other moving solid bodies, e.g. using odometers, using pedometers
    • G01C22/02—Measuring distance traversed on the ground by vehicles, persons, animals or other moving solid bodies, e.g. using odometers, using pedometers by conversion into electric waveforms and subsequent integration, e.g. using tachometer generator
    • 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
    • G01S19/42—Determining position
    • 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
    • G01S19/52—Determining velocity

Abstract

Method and apparatus for modifying an odometer reading in a vehicle navigation system to compensate for odometer errors. A first distance measurement is obtained from the odometer, and a second distance measurement is obtained from at least one other sensor. The difference between the first and second distance measurements is determined and an adjustment amount is generated in response thereto. A modification factor is then adjusted by the adjustment amount, the modification factor being for modifying the odometer reading. The odometer reading is then modified with the modification factor. A method and apparatus for selecting a pulse rate setting in a vehicle navigation system to correspond to a pulse rate associated with the odometer are also described. A first distance measurement is obtained from the odometer and a second distance measurement is obtained from at least one other sensor. The difference between the first and second distance measurements is then determined.
The pulse rate setting is changed to correspond to the odometer pulse rate if the difference is greater than a threshold level, and is left unchanged if the difference is less than the threshold level.
CA002184549A 1995-09-14 1996-08-30 Method and apparatus for calibration of a distance sensor in a vehicle navigation system Expired - Fee Related CA2184549C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/528,075 1995-09-14
US08/528,075 US5898390A (en) 1995-09-14 1995-09-14 Method and apparatus for calibration of a distance sensor in a vehicle navigation system

Publications (2)

Publication Number Publication Date
CA2184549A1 true CA2184549A1 (en) 1997-03-15
CA2184549C CA2184549C (en) 1999-10-12

Family

ID=24104166

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002184549A Expired - Fee Related CA2184549C (en) 1995-09-14 1996-08-30 Method and apparatus for calibration of a distance sensor in a vehicle navigation system

Country Status (6)

Country Link
US (2) US5898390A (en)
EP (1) EP0763713B1 (en)
JP (1) JPH09119842A (en)
KR (1) KR100272901B1 (en)
CA (1) CA2184549C (en)
DE (1) DE69632438T2 (en)

Families Citing this family (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4992599A (en) * 1998-07-13 2000-02-01 Cellomics, Inc. A system for cell-based screening
US6147626A (en) * 1998-08-11 2000-11-14 Visteon Technologies, Llc Determination of zero-angular-velocity output level for angular velocity sensor
US6266615B1 (en) 1999-09-27 2001-07-24 Televigation, Inc. Method and system for an interactive and real-time distributed navigation system
US6654683B2 (en) 1999-09-27 2003-11-25 Jin Haiping Method and system for real-time navigation using mobile telephones
US6360165B1 (en) 1999-10-21 2002-03-19 Visteon Technologies, Llc Method and apparatus for improving dead reckoning distance calculation in vehicle navigation system
US6282496B1 (en) 1999-10-29 2001-08-28 Visteon Technologies, Llc Method and apparatus for inertial guidance for an automobile navigation system
US6615131B1 (en) 1999-12-21 2003-09-02 Televigation, Inc. Method and system for an efficient operating environment in a real-time navigation system
US6405123B1 (en) 1999-12-21 2002-06-11 Televigation, Inc. Method and system for an efficient operating environment in a real-time navigation system
WO2001061276A2 (en) 2000-02-16 2001-08-23 Televigation, Inc. Method and system for an efficient operating environment in a real-time navigation system
US6317683B1 (en) * 2000-10-05 2001-11-13 Navigation Technologies Corp. Vehicle positioning using three metrics
WO2002060157A2 (en) * 2001-01-24 2002-08-01 Televigation, Inc. Real-time navigation system for mobile environment
JP4497748B2 (en) * 2001-04-27 2010-07-07 パイオニア株式会社 Navigation device, server device for navigation system, destination estimation processing program, and recording medium recording destination estimation processing program
ATE556297T1 (en) 2001-08-06 2012-05-15 Panasonic Corp INFORMATION PROVIDING METHOD AND APPARATUS
US6631321B1 (en) 2001-10-29 2003-10-07 Navigation Technologies Corp. Vehicle heading change determination using compensated differential wheel speed
US6629031B2 (en) * 2001-11-06 2003-09-30 Volvo Trucks North America, Inc. Vehicle tampering protection system
US7221287B2 (en) 2002-03-05 2007-05-22 Triangle Software Llc Three-dimensional traffic report
JP4295953B2 (en) * 2002-04-26 2009-07-15 パイオニア株式会社 Distance coefficient learning device, method, program, recording medium for recording the program, movement status calculation device, and current position calculation device
US6807483B1 (en) 2002-10-11 2004-10-19 Televigation, Inc. Method and system for prediction-based distributed navigation
US7610145B2 (en) 2003-07-25 2009-10-27 Triangle Software Llc System and method for determining recommended departure time
US20050107946A1 (en) * 2003-11-13 2005-05-19 Takanori Shimizu Vehicle navigation apparatus
US20050162309A1 (en) * 2004-01-16 2005-07-28 Mci, Inc. Method and apparatus for data filtering in a tracking system
EP1780511A1 (en) * 2005-10-28 2007-05-02 C.R.F. Societa Consortile per Azioni Method and device for automatic calibration of the odometer of a vehicle.
DE102006035597A1 (en) * 2006-07-27 2008-01-31 Siemens Ag Method for determining the travel path and the speed of a vehicle, in particular for safety-critical train control systems
ITMI20061661A1 (en) * 2006-08-31 2008-03-01 Gen Electric METHOD SYSTEM AND READABLE MEANS OF COMPUTER FOR THE ODOMETER EDITION
GB2459479B8 (en) * 2008-04-23 2012-08-08 Bigger Than The Wheel Ltd Short range RF monitoring system
KR101677754B1 (en) 2009-01-20 2016-11-18 코닌클리케 필립스 엔.브이. Method for adjusting a self mixing laser sensor system for measuring the velocity of a vehicle
US8982116B2 (en) * 2009-03-04 2015-03-17 Pelmorex Canada Inc. Touch screen based interaction with traffic data
US9046924B2 (en) * 2009-03-04 2015-06-02 Pelmorex Canada Inc. Gesture based interaction with traffic data
US8619072B2 (en) 2009-03-04 2013-12-31 Triangle Software Llc Controlling a three-dimensional virtual broadcast presentation
US8843290B2 (en) * 2010-07-22 2014-09-23 Qualcomm Incorporated Apparatus and methods for calibrating dynamic parameters of a vehicle navigation system
US8718910B2 (en) 2010-11-14 2014-05-06 Pelmorex Canada Inc. Crowd sourced traffic reporting
IT1403430B1 (en) * 2010-12-24 2013-10-17 Magneti Marelli Spa CALIBRATION PROCEDURE OF AN INERTIAL SENSOR ASSEMBLED IN AN ARBITRARY POSITION ON THE VEHICLE OF A VEHICLE, AND A SENSOR SYSTEM OF THE DYNAMICS OF A VEHICLE MOUNTED ON BOARD IN AN ARBITRARY POSITION
CA2839866C (en) 2011-05-18 2021-04-13 Triangle Software Llc System for providing traffic data and driving efficiency data
US10169822B2 (en) 2011-12-02 2019-01-01 Spireon, Inc. Insurance rate optimization through driver behavior monitoring
US8510200B2 (en) 2011-12-02 2013-08-13 Spireon, Inc. Geospatial data based assessment of driver behavior
US8781718B2 (en) 2012-01-27 2014-07-15 Pelmorex Canada Inc. Estimating time travel distributions on signalized arterials
SE536396C2 (en) * 2012-02-09 2013-10-08 Movelo Ab Determination of activity level of portable electronic equipment
JP5962397B2 (en) * 2012-09-28 2016-08-03 株式会社Ｊｖｃケンウッド Reliability deriving device, navigation device, and reliability deriving method
US10223909B2 (en) 2012-10-18 2019-03-05 Uber Technologies, Inc. Estimating time travel distributions on signalized arterials
US8933802B2 (en) 2012-11-05 2015-01-13 Spireon, Inc. Switch and actuator coupling in a chassis of a container associated with an intermodal freight transport system
US9779379B2 (en) 2012-11-05 2017-10-03 Spireon, Inc. Container verification through an electrical receptacle and plug associated with a container and a transport vehicle of an intermodal freight transport system
US9128183B2 (en) 2012-11-29 2015-09-08 Caterpillar Inc. Machine navigation system utilizing scale factor adjustment
US9188445B2 (en) 2013-05-21 2015-11-17 Honda Motor Co., Ltd. System and method for storing and recalling location data
US9779449B2 (en) 2013-08-30 2017-10-03 Spireon, Inc. Veracity determination through comparison of a geospatial location of a vehicle with a provided data
US10001566B2 (en) * 2013-11-29 2018-06-19 Clarion Co., Ltd. Distance factor learning device, distance factor learning method and current position calculating device
CN104678128A (en) * 2013-11-29 2015-06-03 北汽福田汽车股份有限公司 Automobile speedometer and odometer inspection-correction test system and method
KR101583888B1 (en) 2013-12-19 2016-01-08 현대자동차주식회사 A coating composition with improved sense of sparkle and coating method using it
US20150186991A1 (en) 2013-12-31 2015-07-02 David M. Meyer Creditor alert when a vehicle enters an impound lot
JP2016060219A (en) * 2014-09-12 2016-04-25 アイシン精機株式会社 Vehicle position detector
US9802487B2 (en) 2015-03-13 2017-10-31 Classic Automotive Innovations, Llc Speedometer drive system and method
US9551788B2 (en) 2015-03-24 2017-01-24 Jim Epler Fleet pan to provide measurement and location of a stored transport item while maximizing space in an interior cavity of a trailer
US10785600B2 (en) * 2016-06-06 2020-09-22 Rec N' Trek Ltd. System, device, and method of navigation in tracks
US10037471B2 (en) 2016-07-05 2018-07-31 Nauto Global Limited System and method for image analysis
US10133942B2 (en) 2016-07-05 2018-11-20 Nauto Global Limited System and method for automatic driver identification
JP2019527832A (en) * 2016-08-09 2019-10-03 ナウト, インコーポレイテッドNauto, Inc. System and method for accurate localization and mapping
MY190810A (en) 2016-09-07 2022-05-12 Mitsubishi Heavy Ind Mach Systems Ltd Travel distance calculation device, charging system, travel distance calculation method, program, and storage medium
US10733460B2 (en) 2016-09-14 2020-08-04 Nauto, Inc. Systems and methods for safe route determination
EP3513265A4 (en) 2016-09-14 2020-04-22 Nauto Global Limited Systems and methods for near-crash determination
CN110178104A (en) 2016-11-07 2019-08-27 新自动公司 System and method for determining driver distraction
US10453150B2 (en) 2017-06-16 2019-10-22 Nauto, Inc. System and method for adverse vehicle event determination
US11392131B2 (en) 2018-02-27 2022-07-19 Nauto, Inc. Method for determining driving policy
CN109030341B (en) * 2018-04-30 2023-10-20 交通运输部公路科学研究所 Road detection vehicle distance calibration device, system and method
CN110375786B (en) * 2019-06-27 2021-07-02 驭势科技（北京）有限公司 Calibration method of sensor external parameter, vehicle-mounted equipment and storage medium
CN112097792B (en) * 2020-08-28 2023-05-16 上海大学 Method for calibrating odometer of mobile robot by using Ackerman model
CN112208337B (en) * 2020-09-03 2022-04-26 惠州拓邦电气技术有限公司 Mileage deviation correcting method and device for electric two-wheeled vehicle and electric two-wheeled vehicle
JP7420023B2 (en) * 2020-09-04 2024-01-23 株式会社デンソー Inertial sensor calibration device and inertial sensor calibration program
CN114136342B (en) * 2021-11-30 2024-03-22 深圳市明睿数据科技有限公司 Mileage tampering judging method and system
CN115218922B (en) * 2022-09-05 2022-12-13 杭叉集团股份有限公司 AGV data calibration system and method

Family Cites Families (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845289A (en) * 1972-07-18 1974-10-29 Avon Inc Method and apparatus employing automatic route control system
US4139889A (en) * 1974-06-07 1979-02-13 Ingels George W Apparatus for vehicle position indication
US4672565A (en) * 1981-03-10 1987-06-09 Nippon Soken, Inc. Direction detecting system for vehicles
JPS57169785A (en) * 1981-04-13 1982-10-19 Nissan Motor Travelling guidance system for car
DE3272852D1 (en) * 1981-05-15 1986-10-02 Nippon Denso Co Navigational apparatus for use in automotive vehicles
JPH0619276B2 (en) * 1981-08-17 1994-03-16 工業技術院長 Portable map display device assembly
JPS58151513A (en) * 1982-03-05 1983-09-08 Alps Electric Co Ltd Present position updating display of moving body
US4611293A (en) * 1983-11-28 1986-09-09 Magnavox Government And Industrial Electronics Company Method and apparatus for automatic calibration of magnetic compass
US4797841A (en) * 1983-11-28 1989-01-10 Magnavox Government And Industrial Electronics Company Method and apparatus for automatic calibration of magnetic compass
US4796191A (en) * 1984-06-07 1989-01-03 Etak, Inc. Vehicle navigational system and method
US4914605A (en) * 1984-10-22 1990-04-03 Etak, Inc. Apparatus and method for displaying a map
US4734863A (en) * 1985-03-06 1988-03-29 Etak, Inc. Apparatus for generating a heading signal for a land vehicle
JPH0650559B2 (en) * 1985-04-03 1994-06-29 日産自動車株式会社 Vehicle route guidance device
US4751512A (en) * 1986-01-21 1988-06-14 Oceanonics, Inc. Differential navigation system for remote mobile users
US4831563A (en) * 1986-07-01 1989-05-16 Pioneer Electronic Corporation Method of processing output data from geomagnetic sensor
US4862398A (en) * 1986-11-18 1989-08-29 Sumitomo Electric Industries, Ltd. Correcting method and correcting errors in a terrestrial magnetism heading sensor
KR910004416B1 (en) * 1987-03-13 1991-06-27 미쓰비시덴기 가부시기가이샤 Navigator
DE3715007A1 (en) * 1987-05-06 1988-11-17 Bosch Gmbh Robert METHOD AND DEVICE FOR DETERMINING THE COURSE OF A LAND VEHICLE
EP0314806B1 (en) * 1987-05-11 1995-04-19 Sumitomo Electric Industries Limited Position detection system
DE3719017A1 (en) * 1987-06-06 1988-12-15 Bosch Gmbh Robert METHOD AND DEVICE FOR DETERMINING A DRIVING ROUTE BETWEEN A START POINT AND A DESTINATION POINT
NL8702087A (en) * 1987-09-04 1989-04-03 Philips Nv VEHICLE NAVIGATION DEVICE WITH DISPLAY OF A SELECTED MAP ELEMENT ACCORDING TO A PRE-DEFINED REPRESENTATION STANDARD.
US4964052A (en) * 1987-10-30 1990-10-16 Nec Home Electronics Ltd. Navigation device for use in a vehicle
JP2680318B2 (en) * 1987-12-28 1997-11-19 アイシン・エィ・ダブリュ株式会社 Navigation device
JP2637446B2 (en) * 1987-12-28 1997-08-06 アイシン・エィ・ダブリュ株式会社 Navigation device
JPH01173824A (en) * 1987-12-28 1989-07-10 Aisin Aw Co Ltd Navigation device for vehicle with help function
JPH01214711A (en) * 1988-02-23 1989-08-29 Toshiba Corp Navigation apparatus
JPH023900A (en) * 1988-06-16 1990-01-09 Nissan Motor Co Ltd Present place displaying device for moving body
JPH07117420B2 (en) * 1988-06-27 1995-12-18 パイオニア株式会社 Road data generation method in vehicle-mounted navigation device
JPH07119617B2 (en) * 1988-07-05 1995-12-20 マツダ株式会社 Vehicle navigation system
US4918609A (en) * 1988-10-11 1990-04-17 Koji Yamawaki Satellite-based position-determining system
JPH02107985A (en) * 1988-10-15 1990-04-19 Matsushita Electric Works Ltd Vehicle-mounted distance meter and speed meter
US5060162A (en) * 1988-12-09 1991-10-22 Matsushita Electric Industrial Co., Ltd. Vehicle in-situ locating apparatus
JPH0792388B2 (en) * 1989-04-17 1995-10-09 住友電気工業株式会社 Position detector
US5287297A (en) * 1989-11-02 1994-02-15 Matsushita Electric Industrial Co., Ltd. Magnetic direction finder with correcting circuit
US5179519A (en) * 1990-02-01 1993-01-12 Pioneer Electronic Corporation Navigation system for vehicle
JPH049710A (en) * 1990-04-27 1992-01-14 Pioneer Electron Corp Navigation apparatus for vehicle
US5177685A (en) * 1990-08-09 1993-01-05 Massachusetts Institute Of Technology Automobile navigation system using real time spoken driving instructions
EP0485132B1 (en) * 1990-11-06 1996-03-06 Fujitsu Ten Limited Direction sensor having an earth magnetism sensor and a rate gyro sensor and navigation system having this direction sensor
JPH04315913A (en) * 1991-04-16 1992-11-06 Pioneer Electron Corp Vehicle bearing measuring device
EP0527558B1 (en) * 1991-07-09 1995-11-15 Pioneer Electronic Corporation GPS navigation system with local speed direction sensing and PDOP accuracy evaluation
JP3062301B2 (en) * 1991-07-10 2000-07-10 パイオニア株式会社 GPS navigation device
US5483457A (en) * 1991-10-25 1996-01-09 Matsushita Electric Industrial Co., Ltd. Vehicle navigation system using GPS including correction of coefficients for velocity sensor
EP0570581B1 (en) * 1991-11-01 2001-12-05 Motorola, Inc. An improved accuracy sensory system for vehicle navigation
US5323152A (en) * 1992-04-15 1994-06-21 Sumitomo Electric Industries, Ltd. Apparatus for detecting the position of a vehicle
JP3164659B2 (en) * 1992-09-16 2001-05-08 株式会社ザナヴィ・インフォマティクス Navigation equipment

Also Published As

Publication number Publication date
JPH09119842A (en) 1997-05-06
DE69632438D1 (en) 2004-06-17
CA2184549C (en) 1999-10-12
EP0763713A3 (en) 1998-05-20
KR100272901B1 (en) 2000-12-01
US5912635A (en) 1999-06-15
EP0763713B1 (en) 2004-05-12
DE69632438T2 (en) 2005-05-12
US5898390A (en) 1999-04-27
EP0763713A2 (en) 1997-03-19
KR970016533A (en) 1997-04-28

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