WO2003074969A3 - Electronic compass system - Google Patents

Electronic compass system Download PDF

Info

Publication number
WO2003074969A3
WO2003074969A3 PCT/US2003/006029 US0306029W WO03074969A3 WO 2003074969 A3 WO2003074969 A3 WO 2003074969A3 US 0306029 W US0306029 W US 0306029W WO 03074969 A3 WO03074969 A3 WO 03074969A3
Authority
WO
WIPO (PCT)
Prior art keywords
pattern
best fit
electronic compass
compass system
heading
Prior art date
Application number
PCT/US2003/006029
Other languages
French (fr)
Other versions
WO2003074969A2 (en
Inventor
Harold C Ockerse
Jon H Bechtel
Mark D Bugno
Alan R Watson
Robert R Turnbull
Original Assignee
Gentex 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 Gentex Corp filed Critical Gentex Corp
Priority to CN038050315A priority Critical patent/CN1639542B/en
Priority to AU2003216452A priority patent/AU2003216452A1/en
Priority to JP2003573383A priority patent/JP2005519278A/en
Priority to MXPA04008380A priority patent/MXPA04008380A/en
Priority to CA002475695A priority patent/CA2475695C/en
Priority to EP03743710.0A priority patent/EP1488196B1/en
Priority to KR1020047013562A priority patent/KR100822449B1/en
Publication of WO2003074969A2 publication Critical patent/WO2003074969A2/en
Publication of WO2003074969A3 publication Critical patent/WO2003074969A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
    • G01C17/02—Magnetic compasses
    • G01C17/28—Electromagnetic compasses
    • G01C17/32—Electron compasses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
    • G01C17/02—Magnetic compasses
    • G01C17/28—Electromagnetic compasses
    • G01C17/30—Earth-inductor compasses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
    • G01C17/38—Testing, calibrating, or compensating of compasses

Abstract

An electronic compass system (100) includes a magnetic sensor circuit (102) having at least two sensing elements (104, 106, 108) for sensing perpendicular components of the Earth’s magnetic field vector. A processing circuit (110) is coupled to the sensor circuit to filter, process, and compute a heading. The processing circuit further selects an approximating geometric pattern, such as a sphere, ellipsoid, ellipse, or circle, determines an error metric of the data points relative to the approximating pattern, adjusts the pattern to minimize the error, thereby obtaining a best fit pattern. The best fit pattern is then used to calculate the heading for each successive sensor reading provided that the noise level is not noisy and until a new best fit pattern is identified. The electronic compass system is particularly well suited for implementation in a vehicle rearview mirror assembly (140).
PCT/US2003/006029 2002-03-01 2003-02-28 Electronic compass system WO2003074969A2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CN038050315A CN1639542B (en) 2002-03-01 2003-02-28 Electronic compass system
AU2003216452A AU2003216452A1 (en) 2002-03-01 2003-02-28 Electronic compass system
JP2003573383A JP2005519278A (en) 2002-03-01 2003-02-28 Electronic compass system
MXPA04008380A MXPA04008380A (en) 2002-03-01 2003-02-28 Electronic compass system.
CA002475695A CA2475695C (en) 2002-03-01 2003-02-28 Electronic compass system
EP03743710.0A EP1488196B1 (en) 2002-03-01 2003-02-28 Electronic compass system
KR1020047013562A KR100822449B1 (en) 2002-03-01 2003-02-28 Electronic compass system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US36072302P 2002-03-01 2002-03-01
US60/360,723 2002-03-01
US10/210,910 2002-08-02
US10/210,910 US6968273B2 (en) 2002-03-01 2002-08-02 Electronic compass system

Publications (2)

Publication Number Publication Date
WO2003074969A2 WO2003074969A2 (en) 2003-09-12
WO2003074969A3 true WO2003074969A3 (en) 2004-02-05

Family

ID=27791372

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/006029 WO2003074969A2 (en) 2002-03-01 2003-02-28 Electronic compass system

Country Status (9)

Country Link
US (2) US6968273B2 (en)
EP (1) EP1488196B1 (en)
JP (2) JP2005519278A (en)
KR (1) KR100822449B1 (en)
CN (1) CN1639542B (en)
AU (1) AU2003216452A1 (en)
CA (1) CA2475695C (en)
MX (1) MXPA04008380A (en)
WO (1) WO2003074969A2 (en)

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US6968273B2 (en) 2005-11-22
AU2003216452A8 (en) 2003-09-16
CA2475695A1 (en) 2003-09-12
KR100822449B1 (en) 2008-04-16
JP4759578B2 (en) 2011-08-31
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US20040236510A1 (en) 2004-11-25
MXPA04008380A (en) 2004-11-26
AU2003216452A1 (en) 2003-09-16
EP1488196A4 (en) 2011-07-06
CA2475695C (en) 2008-11-04
US6928366B2 (en) 2005-08-09
CN1639542A (en) 2005-07-13
CN1639542B (en) 2012-04-25
KR20040088565A (en) 2004-10-16
US20030167121A1 (en) 2003-09-04
EP1488196A2 (en) 2004-12-22
WO2003074969A2 (en) 2003-09-12

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