CA2514154A1 - Electronic compass system - Google Patents

Electronic compass system Download PDF

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Publication number
CA2514154A1
CA2514154A1 CA002514154A CA2514154A CA2514154A1 CA 2514154 A1 CA2514154 A1 CA 2514154A1 CA 002514154 A CA002514154 A CA 002514154A CA 2514154 A CA2514154 A CA 2514154A CA 2514154 A1 CA2514154 A1 CA 2514154A1
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CA
Canada
Prior art keywords
vehicle
output signals
circuit
heading
electronic compass
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Granted
Application number
CA002514154A
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French (fr)
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CA2514154C (en
Inventor
Harold C. Ockerse
Jon H. Bechtel
Mark D. Bugno
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Gentex Corp
Original Assignee
Gentex Corporation
Harold C. Ockerse
Jon H. Bechtel
Mark D. Bugno
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Application filed by Gentex Corporation, Harold C. Ockerse, Jon H. Bechtel, Mark D. Bugno filed Critical Gentex Corporation
Publication of CA2514154A1 publication Critical patent/CA2514154A1/en
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Publication of CA2514154C publication Critical patent/CA2514154C/en
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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
    • 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 includes a magnetic sensor circuit having at least two sensing elements for sensing perpendicular components of the Earth's magnetic field vector. A processing circuit is coupled to the sensor circuit to filter, process, and compute a heading. The processing circuit may determine whether too much noise is present in the output signals received from said magnetic sensor circuit as a function of the relative strength of the Earth's magnetic field vector. The magnetic sensor circuit may include three magnetic field sensing elements contained in a common integrated package having a plurality of leads extending therefrom for mounting to a circuit board. The sensing elements need not be perpendicular to each other or parallel or perpendicular with the circuit board. The electronic compass system is particularly well suited for implementation in a vehicle rearview mirror assembly.

Claims (103)

1. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components; and a processing circuit coupled to said magnetic sensor circuit for:
receiving the output signals from said magnetic sensor circuit, determining a relative strength of the Earth's magnetic field vector, determining whether too much noise is present in the output signals received from said magnetic sensor circuit as a function of the relative strength of the Earth's magnetic field vector, if there is not too much noise present in the output signals, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading or a prior heading if too much noise is present in the output signals.
2. The electronic compass system of claim 1, wherein said processing circuit determines whether too much noise is present in the output signals received from said magnetic sensor circuit when the variation in the output signals exceeds a threshold noise level.
3. The electronic compass system of claim 2, wherein said processing circuit further determines whether too much noise is present in the output signals received from said magnetic sensor circuit to update data used to calibrate the compass system, said processing circuit does not update the data used to calibrate the compass system when too much noise is present.
4. The electronic compass system of claim 3, wherein said processing circuit:
determines that too much noise is present in the output signals received from said magnetic sensor circuit to update data used to calibrate the compass system when the variation in the output signals exceeds the threshold noise level, and determines that too much noise is present in the output signals received from said magnetic sensor circuit to update the heading signal when a defined time period has not yet elapsed from when the variation in the output signals last exceeded the threshold noise level.
5. The electronic compass system of claim 4, wherein the time period that must elapse before the heading signal can be updated is set as a function of the strength of the Earth's magnetic field.
6. The electronic compass system of claim 4, wherein the threshold noise level is set as a function of the Earth's magnetic field.
7. The electronic compass system of claim 1, wherein said processing circuit further determines whether too much noise is present in the output signals received from said magnetic sensor circuit to update data used to calibrate the compass system, said processing circuit does not update the data used to calibrate the compass system when too much noise is present.
8. The electronic compass system of claim 7, wherein said processing circuit determines whether too much noise is present in the output signals received from said magnetic sensor circuit to update data used to calibrate the compass system when the variation in the output signals exceeds a threshold noise level.
9. An electronic compass assembly for a vehicle, comprising:
a circuit board defining a plane corresponding to a mounting surface thereof;
a magnetic sensor circuit mounted on said circuit board for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components, wherein said magnetic sensor circuit includes at least two magnetic field sensing elements each having an axis of sensitivity, wherein at least one of said magnetic field sensing elements is positioned such that its axis of sensitivity is oriented in one of the following two orientations: (a) non-perpendicular and non-parallel to the plane of said circuit board, and (b) non-perpendicular to the axis of sensitivity of another one of said at least two magnetic field sensing elements; and a processing circuit coupled to said magnetic sensor circuit for receiving the output signals, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading.
10. The electronic compass assembly of claim 9, wherein said magnetic compass sensor circuit includes three magnetic field sensing elements none of which are perpendicular or parallel to the plane of said circuit board.
11. The electronic compass assembly of claim 9, wherein said magnetic sensor circuit includes three magnetic field sensing elements contained in a common integrated package having a plurality of leads extending therefrom for mounting to said circuit board
12. The electronic compass assembly of claim 9, wherein said processing circuit performs a coordinate transform to account for the positioning of at least one of said magnetic field sensing elements such that its axis of sensitivity is oriented in one of the following two orientations: (a) non-perpendicular and non-parallel to the plane of said circuit board, and (b) non-perpendicular to the axis of sensitivity of another one of said at least two magnetic field sensing elements.
13. The electronic compass assembly of claim 12, wherein said processing circuit performs a coordinate transform of an original reference frame S having an x-axis, a y-axis, and a z-axis by:
(a) rotation of the original reference frame S by an angle a about the x-axis into a reference frame S' having an x'-axis, a y'-axis, and a z'-axis;
(b) rotation of the reference frame S' by an angle .beta. about the y'-axis into a reference frame S" having an x"-axis, a y"-axis, and a z"-axis; and (c) rotation of the reference frame S" by an angle y about the z"-axis into reference coordinate frame S"'.
14. The electronic compass assembly of claim 13, wherein said processing circuit performs the coordinate transform using the following linear equation:
15. A rearview mirror assembly for a vehicle, comprising:
a mirror mounting structure configured to mounting to a vehicle and having a mirror housing;
a mirror mounted in said mirror housing;
a circuit board carried by said mirror mounting structure;
a magnetic sensor circuit mounted on said circuit board for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components, wherein said magnetic sensor circuit includes three magnetic field sensing elements contained in a common integrated package having a plurality of leads extending therefrom for mounting to said circuit board; and a processing circuit coupled to said magnetic sensor circuit for receiving the output signals from said magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading.
16. The rearview mirror assembly of claim 15, wherein said circuit board defines a plane corresponding to a mounting surface thereof, wherein each of said magnetic field sensing elements has an axis of sensitivity, and wherein at least one of said magnetic field sensing elements is positioned such that its axis of sensitivity is oriented in one of the following two orientations: (a) non-perpendicular and non-parallel to the plane of said circuit board, and (b) non-perpendicular to the axis of sensitivity of another one of said at least two magnetic field sensing elements.
17. An electronic compass subassembly for a vehicle, comprising:
a circuit board including a connector for connecting an electrical component;
and a processing circuit mounted on said on said circuit board and electrically coupled to said connector for communicating with the electrical component, wherein said processing circuit is coupled to a magnetic sensor circuit for receiving output signals representing at least two components of the Earth's magnetic field vector, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading, wherein said processing circuit is configured to communicate using at least two different signal formats associated with different types of electronic components, and wherein a particular signal format used by said processing circuit to communicate with the electrical component connected to said connector is selectable.
18. The electronic compass subassembly of claim 17, wherein said electronic component is a display driver circuit.
19. The electronic compass subassembly of claim 18, wherein said display driver circuit is mounted on a daughter circuit board, said circuit boards each comprising a connector that electrically couples said circuit boards.
20. The electronic compass subassembly of claim 19, wherein said connector of said daughter circuit board has a connector configuration that is unique for the type of display driver circuit mounted thereon.
21. The electronic compass subassembly of claim 20, wherein said processing circuit automatically selects the particular signal format used to communicate with said display driver circuit based upon the connector configuration of the connector of said daughter circuit board.
22. The electronic compass subassembly of claim 17, wherein electronic component is mounted on a daughter circuit board, said circuit boards each comprising a connector that electrically couples said circuit boards.
23. The electronic compass subassembly of claim 22, wherein said connector of said daughter circuit board has a connector configuration that is unique for the type of electronic component mounted thereon.
24. The electronic compass subassembly of claim 23, wherein said processing circuit automatically selects the particular signal format used to communicate with said electronic component based upon the connector configuration of the connector of said daughter circuit board.
25. The electronic compass subassembly of claim 17, wherein said electronic component is a vehicle bus interface circuit.
26. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components;
a processing circuit coupled to said magnetic sensor circuit for receiving the output signals from said magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading; and a display coupled to said processing circuit for receiving said heading signal and displaying the computed heading, said display further configured to display a geographical representation of at least one geographic region and a geographic magnetic variance zone within the geographic region for which the compass is presently calibrated.
27. The electronic compass system of claim 26, wherein the geographic magnetic variance zone displayed on said display is a time zone in which the vehicle is located.
28. The electronic compass system of claim 27, wherein said processing circuit is coupled to a vehicle electrical component for receiving information from which the time zone in which the vehicle is located may be identified.
29. The electronic compass system of claim 28, wherein said vehicle electrical component is an RDS radio.
30. The electronic compass system of claim 28, wherein said vehicle electrical component is a GPS receiver.
31. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components;
a processing circuit coupled to said magnetic sensor circuit for receiving the output signals from said magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading; and a display coupled to said processing circuit for receiving said heading signal and displaying the computed heading, said display further configured to display a time zone for which the compass is presently calibrated.
32. The electronic compass system of claim 319 wherein said processing circuit is coupled to a vehicle electrical component for receiving information from which the time zone in which the vehicle is located may be identified.
33. The electronic compass system of claim 32, wherein said vehicle electrical component is an RDS radio.
34. The electronic compass system of claim 32, wherein said vehicle electrical component is a GPS receiver.
35. The electronic compass system of claim 31, wherein said display is a graphic display displaying a geographical representation of a geographic region and its various time zones.
36. The electronic compass system of claim 31, wherein said display is an alphanumeric display.
37. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components; and a processing circuit coupled to said magnetic sensor circuit for receiving the output signals from said magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading, wherein said processing circuit is coupled to a vehicle electrical component to receive an indication of a time zone in which the vehicle is presently traveling, said processing circuit compensates the heading computation as a function of geographic magnetic variance for the time zone in which the vehicle is presently traveling.
38. The electronic compass system of claim 37, wherein said vehicle electrical component is an RDS radio.
39. The electronic compass system of claim 37, wherein said vehicle electrical component is a GPS receiver.
40. The electronic compass system of claim 37, wherein said processing circuit is further adapted for:
storing historical samples of the computed heading at periodic intervals, analyzing the stored historical samples to determine at which four sets of values of the sensed components that the vehicle travels most frequently, computing a variance of the four sets of values of the sensed components that the vehicle travels most frequently from the four sets of values of the sensed components that the processing circuit had identified as corresponding to headings of north, south, east, and west, and compensating the heading computation as a function of the computed variance.
41. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components; and a processing circuit coupled to said magnetic sensor circuit for:
receiving the output signals from said magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, generating a heading signal representing the computed heading, storing historical samples of the computed heading at periodic intervals, analyzing the stored historical samples to determine at which four sets of values of the sensed components that the vehicle travels most frequently, computing a variance of the four sets of values of the sensed components that the vehicle travels most frequently from the four sets of values of the sensed components that the processing circuit had identified as corresponding to headings of north, south, east, and west, and compensating the heading computation as a function of the computed variance.
42. The electronic compass system of claim 41, wherein said magnetic sensor circuit is mounted in a mirror housing of a rearview mirror assembly of the vehicle, and wherein the compensation performed by said processing circuit compensates for rotation of the mirror housing relative to the vehicle.
43. The electronic compass system of claim 41, wherein the compensation performed by said processing circuit compensates for geographic magnetic variance.
44. The electronic compass system of claim 41, wherein, when storing historical samples and analyzing the stored historical samples, said processing circuit excludes samples corresponding to headings traveled before or following a turn that is not equal to approximately a 90 degree turn.
45. The electronic compass system of claim 41, wherein, when storing historical samples and analyzing the stored historical samples, said processing circuit gives less weight to samples obtained before and after the first detected heading change occurring during an ignition cycle.
46. The electronic compass system of claim 41, wherein, when storing historical samples and analyzing the stored historical samples, said processing circuit gives less weight to samples obtained before and after the last detected heading change occurring during an ignition cycle.
47. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components; and a processing circuit coupled to said magnetic sensor circuit for:
receiving the output signals from said magnetic sensor circuit, computing a noise level from the output signals received from said magnetic sensor circuit as a function of a root mean square of values derived from the output signals, determining whether too much noise is present in the output signals received from said magnetic sensor circuit if the noise level exceeds a threshold noise level, if there is not too much noise present in the output signals, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading or a prior heading if too much noise is present in the output signals.
48. The electronic compass system of claim 47, wherein said processing circuit computes second derivatives of the output signals from said compass sensor circuit, and wherein said processing circuit computes the noise level as a function of the root mean square of the computed second derivatives.
49. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components; and a processing circuit coupled to said magnetic sensor circuit for:
receiving the output signals from said magnetic sensor circuit, computing a noise level from the output signals received from said magnetic sensor circuit as a function of a mean square error of values derived from the output signals, determining whether too much noise is present in the output signals received from said magnetic sensor circuit if the noise level exceeds a threshold noise level, if there is not too much noise present in the output signals, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading or a prior heading if too much noise is present in the output signals.
50. The electronic compass system of claim 49, wherein said processing circuit computes second derivatives of the output signals from said compass sensor circuit, and wherein said processing circuit computes the noise level as a function of the mean square error of the computed second derivatives.
51. In a vehicle having a conductive glass windshield with an electrically conductive material incorporated therein and an electronic compass system having a magnetic sensor circuit located in proximity to the conductive glass windshield, the magnetic sensor circuit senses at least two components of the Earth's magnetic field vector and generates output signals representing the at least two sensed components, an improvement comprising:
a processing circuit coupled to the magnetic sensor circuit for sampling the output signals from the magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading; and compensating means for compensating for the effect of an electric field caused by a conductive glass windshield on the magnetic field sensed by the magnetic sensor circuit.
52. The vehicle improvement of claim 51, wherein said compensating means comprises a controller for supplying a pulsed activation signal to the electrically conductive material incorporated in the conductive glass windshield when the conductive glass windshield is to be activated, the pulsed activation signal being pulsed between high and low power activation states, said controller supplies a signal to said processing circuit that identifies when the pulsed activation signal is in a low power activation state, wherein said processing circuit tunes the sampling of the output signals from the magnetic sensor circuit such that samples are not taken when the pulsed activation signal is in a low power activation state so as to prevent the reading of samples of the output signals of the magnetic sensor circuit when noise is produced by the conductive glass windshield.
53. The vehicle improvement of claim 51, wherein said compensating means comprises a coil provided in proximity to the compass sensor circuit to create a magnetic field that nulls a magnetic field produced by the conductive glass windshield when the conductive glass windshield is activated.
54. The vehicle improvement of claim 51, wherein said compensating means comprises a pattern of conductive strips of the electrically conductive material of the conductive glass windshield, wherein at least adjacent first and second conductive strips extending in close proximity to the compass sensor circuit are patterned such that current passes through the first conductive strip in an opposite direction from the current passing through the adjacent second conductive strip so as to create magnetic fields that null one another.
55. The vehicle improvement of claim 51, wherein said compensating means comprises a pattern of very thin wires, wherein at least adjacent first and second wires extending in close proximity to the compass sensor circuit are positioned such that current passes through the first wire in an opposite direction from the current passing through the adjacent second wire so as to create magnetic fields that null one another.
56. The vehicle improvement of claim 51, wherein the electrically conductive material on the conductive glass window is provided in at least two portions and said compensating means comprises a window controller that periodically alternates the direction in which current is applied to the portions.
57. The vehicle improvement of claim 51, wherein said compensating means comprises a magnetic shielding coating placed between the conductive glass windshield and the compass sensor circuit.
58. The vehicle improvement of claim 51, wherein said compensating means comprises a monitoring circuit that monitors the output of the magnetic sensor circuit to identify rising and falling of levels of the output signals in a manner consistent with that caused by a magnetic field caused by the conductive glass windshield.
59. The vehicle improvement of claim 58, wherein the monitoring circuit prevents the sampling of the output signals by the processing circuit when such rising and falling of the levels of the output signals is identified.
60. The vehicle improvement of claim 58, wherein said monitoring circuit is a digital signal processor.
61. The vehicle improvement of claim 58, wherein said monitoring circuit is a portion of said processing circuit.
62. The vehicle improvement of claim 58, wherein said magnetic sensor circuit comprises three sensing elements for supplying three output signals representing three orthogonal components of the Earth's magnetic field, wherein said monitoring circuit monitors the output signals of all three of said sensing elements to identify rising and falling of levels of the output signals in a manner consistent with that caused by a magnetic field caused by the conductive glass windshield.
63. The vehicle improvement of claim 58, wherein said magnetic sensor circuit comprises two sensing elements for supplying two output signals representing two orthogonal components of the Earth's magnetic field, wherein said monitoring circuit monitors the output signals of both of said sensing elements to identify rising and falling of levels of the output signals in a manner consistent with that caused by a magnetic field caused by the conductive glass windshield.
64.. The vehicle improvement of claim 58, wherein said processing circuit selects a first approximating geometric pattern based on a first set of reference data points derived from the sensed components, and computes a heading of the vehicle as a function of at least two of the sensed components while referencing the first approximating geometric pattern.
65. The vehicle improvement of claim 64, wherein said compensating means includes a portion of said processing circuit, wherein, during such time that said monitoring circuit identifies rising and falling of levels of the output signals in a manner consistent with that caused by a magnetic field caused by the conductive glass windshield, said portion of said processing circuit selects a second approximating geometric pattern based on reference data points received and utilizes the second approximating geometric pattern to compute the heading of the vehicle.
66. The vehicle improvement of claim 65, wherein during such time that said monitoring circuit does not identify rising and falling of levels of the output signals in a manner consistent with that caused by a magnetic field caused by the conductive glass windshield, said portion of said processing circuit utilizes the first approximating geometric pattern to compute the heading of the vehicle.
67. The vehicle improvement of claim 64, wherein said compensating means includes a portion of said processing circuit, wherein, during such time that said monitoring circuit identifies rising and falling of levels of the output signals in a manner consistent with that caused by a magnetic field caused by the conductive glass windshield, said portion of said processing circuit shifts the first approximating geometric pattern by an offset corresponding to a shift in the levels of the output signals caused by the conductive glass windshield when activated.
68. The vehicle improvement of claim 51, wherein said compensating means comprises a controller that activates the conductive glass windshield using a periodic activation signal having a predetermined frequency, wherein said processing circuit samples the output signals of the compass sensor circuit at twice the predetermined frequency of the activation signal, said processing circuit averages the samples of the output signals and subtracts any DC offset to eliminate the effect of the noise produced by the conductive glass windshield.
69. The vehicle improvement of claim 519 wherein the electrically conductive material incorporated within the conductive glass windshield is provided in the form of very thin wires. or transparent strips.
70. The vehicle improvement of claim 51, wherein the electrically conductive material incorporated within the conductive glass windshield is provided in the form of transparent strips.
71. The vehicle improvement of claim 51, wherein said compensating means immediately compensates for the effect of an electric field caused by a conductive glass windshield on the magnetic field sensed by the magnetic sensor circuit upon detection of the activation of the conductive glass windshield.
72. A method of mounting magnetic sensing elements on a circuit board, the method comprising:
mounting a first magnetic sensing element on a first portion of the circuit board;
mounting a second magnetic sensing element on a second portion of the circuit board;
bending the second portion of the circuit board to reorient the second magnetic sensing element relative to the first magnetic sensing element; and securing the second portion of the circuit board relative to the first portion of the circuit board to retain the reoriented positions of the first and second magnetic sensing elements.
73. The method of claim 72 and further comprising mounting a third magnetic sensing element on the first portion of the circuit board.
74. The method of claim 739 wherein the third magnetic sensing element is mounted on the first portion of the circuit board substantially perpendicular to the first magnetic sensing element.
75. The method of claim 74, wherein the second magnetic sensing element is mounted on the second portion of the circuit board and reoriented so as to be substantially perpendicular to the first and third magnetic sensing elements.
76. The method of claim 72, wherein the second magnetic sensing element is mounted on the second portion of the circuit board and reoriented so as to be substantially perpendicular to the first magnetic sensing element.
77. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components; and a processing circuit coupled to said magnetic sensor circuit for:
receiving the output signals from said magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, generating a heading signal representing the computed heading, monitoring the output signals to identify changes in vehicle heading representing a vehicle turn of about 90 degrees, storing the sensed components for those vehicle headings traveled immediately before and after any vehicle turn of about 90 degrees, computing a variance of the stored sensed components from the four sets of values of the sensed components that the processing circuit had identified as corresponding to headings of north, south, east, and west, and compensating the heading computation as a function of the computed variance.
78. The electronic compass system of claim 77, wherein said processing circuit stores the sensed components for those vehicle headings traveled immediately before and after any vehicle turn of about 90 degrees if it is determined that the sensed components are within acceptable boundaries of other sensed components previously stored.
79. The electronic compass system of claim 77, wherein said processing circuit stores the sensed components for those vehicle headings traveled immediately before and after any vehicle turn of about 90 degrees if it is determined that the vehicle travels along these headings for at least predetermined time period.
80. An electronic compass system for a vehicle, comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector, and for generating output signals representing the at least two sensed components; and a processing circuit coupled to said magnetic sensor circuit for receiving the output signals from said magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading, wherein said processing circuit determines in which of a plurality of geographic zones the vehicle is presently traveling, and compensates the heading computation as a function of geographic magnetic variance for the geographic zone in which the vehicle is presently traveling, wherein said processing circuit determines in which geographic zone the vehicle is currently traveling by monitoring for changes in vehicle location relative to the plurality of geographic zones by monitoring vehicle headings and time of travel at each vehicle heading.
81. An electronic compass system for use in a vehicle having vehicle equipment consisting of one of a convertible top and sunroof, said electronic compass system comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector and generating output signals representing the at least two sensed components;
a processing circuit coupled to the magnetic sensor circuit for sampling the output signals from the magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading; and compensating means for compensating for the effect of a change in the opened or closed state of the vehicle equipment on the magnetic field sensed by the magnetic sensor circuit.
82. The electronic compass system of claim 81, wherein said compensating means comprises a monitoring circuit that monitors the output of the magnetic sensor circuit to identify changes in the levels of the output signals in a manner consistent with that caused by the opened or closed state of the vehicle equipment.
83. The electronic compass system of claim 82, wherein said monitoring circuit is a digital signal processor.
84. The electronic compass system of claim 82, wherein said monitoring circuit is a portion of said processing circuit.
85. The electronic compass system of claim 82, wherein said magnetic sensor circuit comprises three sensing elements for supplying three output signals representing three orthogonal components of the Earth's magnetic field, wherein said monitoring circuit monitors the output signals of all three of said sensing elements to identify changes in the levels of the output signals in a manner consistent with that caused by the opened or closed state of the vehicle equipment.
86. The electronic compass system of claim 82, wherein said magnetic sensor circuit comprises two sensing elements for supplying two output signals representing two orthogonal components of the Earth's magnetic field, wherein said monitoring circuit monitors the output signals of both of said sensing elements to identify changes in the levels of the output signals in a manner consistent with that caused by the opened or closed state of the vehicle equipment.
87. The electronic compass system of claim 82, wherein said processing circuit selects a first approximating geometric pattern based on a first set of reference data points derived from the sensed components, and computes a heading of the vehicle as a function of at least two of the sensed components while referencing the first approximating geometric pattern.
88. The electronic compass system of claim 87, wherein said compensating means includes a portion of said processing circuit, wherein, during such time that said monitoring circuit identifies changes in the levels of the output signals in a manner consistent with that caused by the opened or closed state of the vehicle equipment, said portion of said processing circuit selects a second approximating geometric pattern based on reference data points received and utilizes the second approximating geometric pattern to compute the heading of the vehicle.
89. The electronic compass system of claim 88, wherein during such time that said monitoring circuit does not identify changes in the levels of the output signals in a manner consistent with that caused by the opened or closed state of the vehicle equipment, said portion of said processing circuit utilizes the first approximating geometric pattern to compute the heading of the vehicle.
90. The electronic compass system of claim 87, wherein said compensating means includes a portion of said processing circuit, wherein, during such time that said monitoring circuit identifies changes in the levels of the output signals in a manner consistent with that caused by the opened or closed state of the vehicle equipment, said portion of said processing circuit shifts the first approximating geometric pattern by an offset corresponding to a shift in the levels of the output signals caused by the conductive glass windshield when activated.
91. The electronic compass system of claim 81, wherein said compensating means immediately compensates for the effect of an electric field caused by the opened or closed state of the vehicle equipment on the magnetic field sensed by the magnetic sensor circuit upon detection of an activation signal that causes the change in the opened or closed state of the vehicle equipment.
92. An electronic compass system for use in a vehicle having at least one vehicle accessory capable of adversely effecting the operation of the compass system, said electronic compass system comprising:
a magnetic sensor circuit for sensing at least two components of the Earth's magnetic field vector and generating output signals representing the at least two sensed components;
a processing circuit coupled to the magnetic sensor circuit for sampling the output signals from the magnetic sensor circuit, computing a heading of the vehicle as a function of the sensed components, and generating a heading signal representing the computed heading; and wherein said processing circuit immediately compensates for the effect of the vehicle accessory on the magnetic field sensed by the magnetic sensor circuit upon detection of the effect of the vehicle accessory on the magnetic field without requiring a signal from the vehicle accessory.
93. The electronic compass system of claim 92, wherein said compensating means comprises a monitoring circuit that monitors the output of the magnetic sensor circuit to identify changes in the levels of the output signals in a manner consistent with that caused by the vehicle accessory.
94. The electronic compass system of claim 93, wherein said monitoring circuit is a digital signal processor.
95. The electronic compass system of claim 93, wherein said monitoring circuit is a portion of said processing circuit.
96. The electronic compass system of claim 93, wherein said magnetic sensor circuit comprises three sensing elements for supplying three output signals representing three orthogonal components of the Earth's magnetic field, wherein said monitoring circuit monitors the output signals of all three of said sensing elements to identify changes in the levels of the output signals in a manner consistent with that caused by the vehicle accessory.
97. The electronic compass system of claim 93, wherein said magnetic sensor circuit comprises two sensing elements for supplying two output signals representing two orthogonal components of the Earth's magnetic field, wherein said monitoring circuit monitors the output signals of both of said sensing elements to identify changes in the levels of the output signals in a manner consistent with that caused by the vehicle accessory.
98. The electronic compass system of claim 93, wherein said processing circuit selects a first approximating geometric pattern based on a first set of reference data points derived from the sensed components, and computes a heading of the vehicle as a function of at least two of the sensed components while referencing the first approximating geometric pattern.
99. The electronic compass system of claim 98, wherein said compensating means includes a portion of said processing circuit, wherein, during such time that said monitoring circuit identifies changes in the levels of the output signals in a manner consistent with that caused by the vehicle accessory, said portion of said processing circuit selects a second approximating geometric pattern based on reference data points received and utilizes the second approximating geometric pattern to compute the heading of the vehicle.
100. The electronic compass system of claim 99, wherein during such time that said monitoring circuit does not identify changes in the levels of the output signals in a manner consistent with that caused by the vehicle accessory, said portion of said processing circuit utilizes the first approximating geometric pattern to compute the heading of the vehicle.
101. The electronic compass system of claim 98, wherein said compensating means includes a portion of said processing circuit, wherein, during such time that said monitoring circuit identifies changes in the levels of the output signals in a manner consistent with that caused by the vehicle accessory, said portion of said processing circuit shifts the first approximating geometric pattern by an offset corresponding to a shift in the levels of the output signals caused by the vehicle accessory when activated.
102. The electronic compass system of claim 92, wherein said compensating means immediately compensates for the effect of an electric field caused by the opened or closed state of the vehicle equipment on the magnetic field sensed by the magnetic sensor circuit upon detection of the activation of the change in the vehicle accessory.
103. The electronic compass system of claim 93, wherein said monitoring circuit monitors the voltage of the vehicle's battery and monitors the output of the magnetic sensor circuit to identify changes in the levels of the output signals in a manner consistent with that caused by the vehicle accessory taken as a function of the voltage of the vehicle's battery.
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Families Citing this family (154)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5910854A (en) 1993-02-26 1999-06-08 Donnelly Corporation Electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films, and processes for making such solid films and devices
US5668663A (en) 1994-05-05 1997-09-16 Donnelly Corporation Electrochromic mirrors and devices
US6891563B2 (en) * 1996-05-22 2005-05-10 Donnelly Corporation Vehicular vision system
US6326613B1 (en) 1998-01-07 2001-12-04 Donnelly Corporation Vehicle interior mirror assembly adapted for containing a rain sensor
US8294975B2 (en) 1997-08-25 2012-10-23 Donnelly Corporation Automotive rearview mirror assembly
US6124886A (en) 1997-08-25 2000-09-26 Donnelly Corporation Modular rearview mirror assembly
US6172613B1 (en) 1998-02-18 2001-01-09 Donnelly Corporation Rearview mirror assembly incorporating vehicle information display
US8288711B2 (en) 1998-01-07 2012-10-16 Donnelly Corporation Interior rearview mirror system with forwardly-viewing camera and a control
US6445287B1 (en) 2000-02-28 2002-09-03 Donnelly Corporation Tire inflation assistance monitoring system
US6329925B1 (en) 1999-11-24 2001-12-11 Donnelly Corporation Rearview mirror assembly with added feature modular display
US6693517B2 (en) 2000-04-21 2004-02-17 Donnelly Corporation Vehicle mirror assembly communicating wirelessly with vehicle accessories and occupants
US6477464B2 (en) 2000-03-09 2002-11-05 Donnelly Corporation Complete mirror-based global-positioning system (GPS) navigation solution
US7749089B1 (en) 1999-02-26 2010-07-06 Creative Kingdoms, Llc Multi-media interactive play system
US6513252B1 (en) * 1999-04-08 2003-02-04 Donnelly Corporation Vehicle compass compensation
US6301794B1 (en) 1999-05-27 2001-10-16 Johnson Controls, Inc. Vehicle compass system with continuous automatic calibration
US6761637B2 (en) 2000-02-22 2004-07-13 Creative Kingdoms, Llc Method of game play using RFID tracking device
US7878905B2 (en) 2000-02-22 2011-02-01 Creative Kingdoms, Llc Multi-layered interactive play experience
US7445550B2 (en) 2000-02-22 2008-11-04 Creative Kingdoms, Llc Magical wand and interactive play experience
WO2007053710A2 (en) 2005-11-01 2007-05-10 Donnelly Corporation Interior rearview mirror with display
US7370983B2 (en) 2000-03-02 2008-05-13 Donnelly Corporation Interior mirror assembly with display
EP1263626A2 (en) 2000-03-02 2002-12-11 Donnelly Corporation Video mirror systems incorporating an accessory module
US7167796B2 (en) 2000-03-09 2007-01-23 Donnelly Corporation Vehicle navigation system for use with a telematics system
US7066781B2 (en) 2000-10-20 2006-06-27 Denise Chapman Weston Children's toy with wireless tag/transponder
US7581859B2 (en) 2005-09-14 2009-09-01 Donnelly Corp. Display device for exterior rearview mirror
ATE363413T1 (en) 2001-01-23 2007-06-15 Donnelly Corp IMPROVED VEHICLE LIGHTING SYSTEM
US7255451B2 (en) 2002-09-20 2007-08-14 Donnelly Corporation Electro-optic mirror cell
US7149627B2 (en) * 2002-03-01 2006-12-12 Gentex Corporation Electronic compass system
US20070066396A1 (en) 2002-04-05 2007-03-22 Denise Chapman Weston Retail methods for providing an interactive product to a consumer
US6967566B2 (en) 2002-04-05 2005-11-22 Creative Kingdoms, Llc Live-action interactive adventure game
US6918674B2 (en) 2002-05-03 2005-07-19 Donnelly Corporation Vehicle rearview mirror system
US20060061008A1 (en) 2004-09-14 2006-03-23 Lee Karner Mounting assembly for vehicle interior mirror
US7329013B2 (en) 2002-06-06 2008-02-12 Donnelly Corporation Interior rearview mirror system with compass
WO2003105099A1 (en) 2002-06-06 2003-12-18 Donnelly Corporation Interior rearview mirror system with compass
US7674184B2 (en) 2002-08-01 2010-03-09 Creative Kingdoms, Llc Interactive water attraction and quest game
MXPA05001880A (en) 2002-08-21 2005-06-03 Gentex Corp Image acquisition and processing methods for automatic vehicular exterior lighting control.
US10144353B2 (en) 2002-08-21 2018-12-04 Magna Electronics Inc. Multi-camera vision system for a vehicle
AU2003278863A1 (en) 2002-09-20 2004-04-08 Donnelly Corporation Mirror reflective element assembly
US7310177B2 (en) 2002-09-20 2007-12-18 Donnelly Corporation Electro-optic reflective element assembly
US20080066331A1 (en) * 2003-02-24 2008-03-20 Johnson Controls Technology Company Magnetometer correction system and method
US9446319B2 (en) 2003-03-25 2016-09-20 Mq Gaming, Llc Interactive gaming toy
CN1910823A (en) 2003-05-19 2007-02-07 金泰克斯公司 Rearview mirror assemblies incorporating hands-free telephone components
US7446924B2 (en) 2003-10-02 2008-11-04 Donnelly Corporation Mirror reflective element assembly including electronic component
US7308341B2 (en) 2003-10-14 2007-12-11 Donnelly Corporation Vehicle communication system
US10575376B2 (en) * 2004-02-25 2020-02-25 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
US10532617B2 (en) 2004-03-04 2020-01-14 Infineon Technologies Ag Apparatus and method for determining a state parameter of an object to be monitored
DE102004010665B4 (en) * 2004-03-04 2014-09-18 Infineon Technologies Ag Device and method for determining a state parameter of an object to be monitored
US9566836B2 (en) 2004-03-04 2017-02-14 Infineon Technologies Ag Apparatus and method for determining a state parameter of an object to be monitored
JP4434818B2 (en) * 2004-03-31 2010-03-17 京セラ株式会社 Error correction method for portable communication terminal and its geomagnetic sensor
JP4447371B2 (en) * 2004-05-11 2010-04-07 ヤマハ発動機株式会社 Propulsion controller control device, propulsion device control device control program, propulsion device control device control method, and cruise control device
JP4167263B2 (en) * 2004-07-15 2008-10-15 株式会社シーアンドエヌ Mobile terminal device
CN1871496B (en) * 2004-09-29 2010-04-28 阿莫善斯有限公司 Magnetic sensor control method, magnetic sensor controller and portable terminal device
JP2006234581A (en) * 2005-02-24 2006-09-07 Aichi Micro Intelligent Corp Electronic compass and azimuth measuring method
ATE517368T1 (en) 2005-05-16 2011-08-15 Donnelly Corp VEHICLE MIRROR ARRANGEMENT WITH CHARACTER ON THE REFLECTIVE PART
US20070088496A1 (en) * 2005-07-20 2007-04-19 Atair Aerospace, Inc. Automatic heading and reference system
US7927216B2 (en) 2005-09-15 2011-04-19 Nintendo Co., Ltd. Video game system with wireless modular handheld controller
JP4805633B2 (en) 2005-08-22 2011-11-02 任天堂株式会社 Game operation device
US7942745B2 (en) 2005-08-22 2011-05-17 Nintendo Co., Ltd. Game operating device
US8313379B2 (en) 2005-08-22 2012-11-20 Nintendo Co., Ltd. Video game system with wireless modular handheld controller
US8870655B2 (en) 2005-08-24 2014-10-28 Nintendo Co., Ltd. Wireless game controllers
JP4262726B2 (en) 2005-08-24 2009-05-13 任天堂株式会社 Game controller and game system
US8308563B2 (en) 2005-08-30 2012-11-13 Nintendo Co., Ltd. Game system and storage medium having game program stored thereon
US8157651B2 (en) 2005-09-12 2012-04-17 Nintendo Co., Ltd. Information processing program
US7510287B2 (en) 2005-10-21 2009-03-31 Donnelly Corporation Wire cover assembly for vehicle interior mirror
EP2378350B1 (en) 2006-03-09 2013-12-11 Gentex Corporation Vehicle rearview assembly including a high intensity display
JP4530419B2 (en) 2006-03-09 2010-08-25 任天堂株式会社 Coordinate calculation apparatus and coordinate calculation program
JP4151982B2 (en) 2006-03-10 2008-09-17 任天堂株式会社 Motion discrimination device and motion discrimination program
JP4684147B2 (en) 2006-03-28 2011-05-18 任天堂株式会社 Inclination calculation device, inclination calculation program, game device, and game program
CN101421585B (en) * 2006-03-30 2011-08-03 京瓷株式会社 Mobile electronic device and method for calibrating terrestrial magnetism sensor
US8045976B2 (en) 2006-04-04 2011-10-25 Aegis Mobility, Inc. Mobility call management
KR100831373B1 (en) * 2006-04-19 2008-05-21 삼성전자주식회사 Electronic device for checking error and method thereof
WO2007129653A1 (en) * 2006-05-09 2007-11-15 Alps Electric Co., Ltd. Calibration program and electronic compass
US8331888B2 (en) * 2006-05-31 2012-12-11 The Boeing Company Remote programmable reference
CN101473194A (en) * 2006-06-21 2009-07-01 Nxp股份有限公司 Magnetic field sensor
US7509748B2 (en) * 2006-09-01 2009-03-31 Seagate Technology Llc Magnetic MEMS sensors
JP2008064761A (en) * 2006-09-06 2008-03-21 Samsung Electro Mech Co Ltd Hybrid type sensor module and sensing method using it
KR20080026395A (en) * 2006-09-20 2008-03-25 삼성전자주식회사 Method and system of 2-axis compass calibration considering magnetic environment and method and system of measuring azimuth using it
US20080106116A1 (en) * 2006-11-03 2008-05-08 Boulakia Charles A Vehicle convertible top with automatic closing feature
JP5127242B2 (en) 2007-01-19 2013-01-23 任天堂株式会社 Acceleration data processing program and game program
US8013780B2 (en) 2007-01-25 2011-09-06 Magna Electronics Inc. Radar sensing system for vehicle
US20080201096A1 (en) * 2007-02-21 2008-08-21 Johnson Controls Technology Company Compass calibration system and method
CA2679931A1 (en) 2007-03-02 2008-09-12 Aegis Mobility, Inc. Management of mobile device communication sessions to reduce user distraction
JP4558840B2 (en) * 2007-03-06 2010-10-06 アルプス電気株式会社 Electronic compass
TW200842060A (en) * 2007-04-23 2008-11-01 Kreton Corp Driving recorder
US7908114B2 (en) * 2007-05-15 2011-03-15 General Electric Company System and method for aligning a railroad signaling system
TW200900655A (en) * 2007-06-21 2009-01-01 Mitac Int Corp Navigation device and method calibrated by map position-matching
EP2028504B1 (en) * 2007-08-23 2016-04-13 STMicroelectronics Srl Method and device for calibrating a magnetic sensor
DE102007042622A1 (en) * 2007-09-07 2009-03-12 Rheinisch-Westfälisch-Technische Hochschule Aachen Method and system for determining the position and / or orientation of an object
US8224353B2 (en) 2007-09-20 2012-07-17 Aegis Mobility, Inc. Disseminating targeted location-based content to mobile device users
JP4412381B2 (en) * 2007-10-02 2010-02-10 トヨタ自動車株式会社 Direction detection device
US20090098855A1 (en) * 2007-10-11 2009-04-16 Cellblock Telecommunications Company, Inc. Method and system for provisioning communication service to a mobile communication device to restrict use when operating a vehicle
US8229669B2 (en) * 2007-12-31 2012-07-24 Wavemarket, Inc. Navigation system implementing dynamic route correction
US20090215466A1 (en) * 2008-02-22 2009-08-27 Darcy Ahl Mobile phone based system for disabling a cell phone while traveling
US9062971B2 (en) * 2008-03-06 2015-06-23 Texas Instruments Incorporated E-compass, tilt sensor, memory and processor with coarse detilting procedure
US8154418B2 (en) 2008-03-31 2012-04-10 Magna Mirrors Of America, Inc. Interior rearview mirror system
US8224575B2 (en) * 2008-04-08 2012-07-17 Ensco, Inc. Method and computer-readable storage medium with instructions for processing data in an internal navigation system
SE532431C2 (en) * 2008-05-30 2010-01-19 Atlas Copco Rock Drills Ab Method and apparatus for determining a correspondence between a representation of an environment and said environment
WO2010025562A1 (en) 2008-09-05 2010-03-11 Aegis Mobility, Inc. Bypassing enhanced services
US8411245B2 (en) * 2009-02-06 2013-04-02 Gentex Corporation Multi-display mirror system and method for expanded view around a vehicle
US8237909B2 (en) * 2009-02-06 2012-08-07 Gentex Corporation Vehicular rearview mirror assembly including integrated backlighting for a liquid crystal display (LCD)
US20100284290A1 (en) * 2009-04-09 2010-11-11 Aegis Mobility, Inc. Context based data mediation
US9615213B2 (en) 2009-07-21 2017-04-04 Katasi Llc Method and system for controlling and modifying driving behaviors
US9386447B2 (en) 2009-07-21 2016-07-05 Scott Ferrill Tibbitts Method and system for controlling a mobile communication device
US8787936B2 (en) 2009-07-21 2014-07-22 Katasi Llc Method and system for controlling a mobile communication device in a moving vehicle
JP5556101B2 (en) * 2009-09-17 2014-07-23 ソニー株式会社 Direction calculation apparatus, correction value initialization method, and mobile phone with direction calculation function
WO2012051500A1 (en) 2010-10-15 2012-04-19 Magna Mirrors Of America, Inc. Interior rearview mirror assembly
US9403415B2 (en) * 2009-10-12 2016-08-02 Ford Global Technologies GPS based pitch sensing for an integrated stability control system
US8851690B2 (en) 2009-10-27 2014-10-07 Magna Mirrors Of America, Inc. Mounting assembly for vehicle interior mirror
US8645093B2 (en) 2009-11-04 2014-02-04 Qualcomm Incorporated Calibrating multi-dimensional sensor for offset, sensitivity, and non-orthogonality
US8880373B2 (en) 2009-11-04 2014-11-04 Qualcomm Incorporated Accurate magnetic compass in mobile electronic device
FR2953284A1 (en) * 2009-12-02 2011-06-03 Movea Sa SYSTEM AND METHOD FOR DRIVER ASSISTANCE OF BIOMECHANIC DRIVE VEHICLE COMPRISING AT LEAST ONE WHEEL
US8209140B2 (en) * 2009-12-17 2012-06-26 Raytheon Company Cooperative calibration of heading sensors
US8374816B2 (en) * 2010-06-08 2013-02-12 Honeywell International Inc. Automatic data collection algorithm for 3D magnetic field calibration with reduced memory requirements
CN102314167A (en) 2010-07-05 2012-01-11 德尔菲技术公司 Central authorities electrical box, electric system and comprise the vehicle of this electric system
US8321161B1 (en) * 2010-09-17 2012-11-27 The United States of America as represented by the Secretarty of the Navy Autonomous magnetic measurement system
US20120101762A1 (en) * 2010-10-26 2012-04-26 Research In Motion Limited System and Method for Calibrating a Magnetometer Using Partial and Full Calibrations
US8922198B2 (en) 2010-10-26 2014-12-30 Blackberry Limited System and method for calibrating a magnetometer according to a quality threshold
US8504077B2 (en) 2010-12-04 2013-08-06 Wavemarket, Inc. System and method for monitoring and disseminating mobile device location information
WO2012118749A1 (en) 2011-02-28 2012-09-07 Gentex Corporation Rearview device support assembly
US8814373B2 (en) 2011-02-28 2014-08-26 Gentex Corporation Rearview device support assembly
US8463569B2 (en) 2011-03-21 2013-06-11 Caterpillar Trimble Control Technologies Llc Method of operating a magnetic compass on a machine
KR20120117121A (en) * 2011-04-14 2012-10-24 주식회사 오토스윙 Apparatus for preventing from dazzling having multi function
US9541393B2 (en) 2011-06-30 2017-01-10 Qualcomm Incorporated Reducing power consumption or error of digital compass
US8577640B2 (en) * 2011-08-17 2013-11-05 Invensense, Inc. Magnetometer bias and anomaly detector
US9046365B2 (en) * 2011-10-27 2015-06-02 Apple Inc. Electronic devices with magnetic field compensating conductive traces
US9683865B2 (en) 2012-01-26 2017-06-20 Invensense, Inc. In-use automatic calibration methodology for sensors in mobile devices
BR112014025395B1 (en) * 2012-04-13 2022-07-26 Wi-Tronix, Llc METHODS TO REGISTER, PROCESS AND TRANSMIT DATA FROM A MOBILE PROPERTY
EP2687955B1 (en) * 2012-07-20 2018-08-22 Nintendo Co., Ltd. Information processing program, information processing system and attitude calculation method for calculating an attitude of an input unit
JP6105221B2 (en) * 2012-07-20 2017-03-29 任天堂株式会社 Information processing program, information processing apparatus, information processing system, and posture calculation method
JP6105222B2 (en) * 2012-07-20 2017-03-29 任天堂株式会社 Information processing program, information processing apparatus, information processing system, and posture calculation method
US9366537B2 (en) * 2012-10-15 2016-06-14 Gentex Corporation Magnetic field compensation system and method thereof
US9352691B2 (en) 2012-11-05 2016-05-31 Magna Mirrors Of America, Inc. Interior rearview mirror assembly
US10309781B2 (en) * 2013-03-15 2019-06-04 Intel Corporation Computing a magnetic heading
US9157747B2 (en) * 2013-03-15 2015-10-13 Innovative Solutions And Support, Inc. Method of calibrating a heading reference system
US9476734B2 (en) * 2013-03-15 2016-10-25 Innovative Solutions And Support, Inc. Systems and methods for calibrating and adjusting a heading reference system
CN104142485B (en) * 2013-05-08 2017-09-15 意法半导体(中国)投资有限公司 The method and apparatus for calibrating Magnetic Sensor
KR102006029B1 (en) * 2013-07-24 2019-08-01 매그나칩 반도체 유한회사 Method and Apparatus for calculation azimuth
KR101444620B1 (en) * 2013-11-22 2014-09-26 한국지질자원연구원 3-axis magnetic survey system and method for magnetic survey using the same
US9587942B2 (en) 2014-04-01 2017-03-07 Magna Mirrors Of America, Inc. Vehicle compass system with heated windshield compensation
RU2582500C2 (en) * 2014-05-14 2016-04-27 Нокиа Текнолоджиз Ой Weather conditions data based on gauss meter
WO2015197769A1 (en) * 2014-06-26 2015-12-30 Gipstech S.R.L. Method for the localization of an individual
WO2016014826A1 (en) * 2014-07-24 2016-01-28 Gentex Corporation Accelerometer integrated with display device
US10162550B2 (en) * 2014-10-15 2018-12-25 Nec Corporation Large-scale, dynamic graph storage and processing system
JP2016167653A (en) * 2015-03-09 2016-09-15 カシオ計算機株式会社 Electronic apparatus and control method thereof
US9699301B1 (en) 2015-05-31 2017-07-04 Emma Michaela Siritzky Methods, devices and systems supporting driving and studying without distraction
CN105072175A (en) * 2015-07-30 2015-11-18 芜湖美智空调设备有限公司 Air conditioner repair requesting method, air conditioner and server
CN105292024A (en) * 2015-11-18 2016-02-03 江苏省农业科学院 Guiding device and method for simple agricultural vehicle linear walking
JP6631357B2 (en) * 2016-03-28 2020-01-15 セイコーエプソン株式会社 Electronic clock
US11163279B2 (en) 2016-06-30 2021-11-02 Intel Corporation Sensor based data set method and apparatus
US10591627B2 (en) 2016-11-08 2020-03-17 Frederick Energy Products, Llc Managing vehicle movement in aisles by use of magnetic vectors
WO2018118292A1 (en) 2016-12-22 2018-06-28 Gentex Corporation Activation of wireless module utilizing magnetic field data
US10163284B2 (en) 2017-02-03 2018-12-25 Gto Access Systems, Llc Method and system for controlling a movable barrier
US10670735B2 (en) * 2017-09-11 2020-06-02 Apple Inc. Determining vehicle orientation for enhanced navigation experience
US11640752B2 (en) * 2018-01-12 2023-05-02 Jeffrey L. Dykes Relative directional indicator
RU2688900C1 (en) * 2018-08-28 2019-05-22 Акционерное общество "Концерн "Центральный научно-исследовательский институт "Электроприбор" Method for measuring ship magnetic course in high latitudes and device for its implementation

Family Cites Families (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357319A (en) * 1944-09-05 Flux valve magnetic compass
US1472342A (en) * 1922-03-18 1923-10-30 Wireless Specialty Apparatus Electromagnetic compass
US2383461A (en) * 1941-10-10 1945-08-28 Sperry Gyroscope Co Inc Flux valve compass system
US2393670A (en) * 1943-03-18 1946-01-29 White Wilfrid Gordon Automatic self-compensating magnetic compass system
US2407536A (en) * 1943-06-23 1946-09-10 Gen Motors Corp Compass
US2464057A (en) * 1944-11-23 1949-03-08 Fairchild Camera Instr Co Earth inductor compass
US2466687A (en) * 1945-08-13 1949-04-12 Sperry Corp Integrating and remote reading compass system
FR2212536B1 (en) * 1973-01-02 1976-04-09 Crouzet Sa
US4424631A (en) * 1982-03-02 1984-01-10 Prince Corporation Electrical compass
US4425717A (en) * 1982-06-24 1984-01-17 Prince Corporation Vehicle magnetic sensor
US4546551A (en) * 1983-03-24 1985-10-15 Prince Corporation Electrical control system
US4505054A (en) * 1983-05-25 1985-03-19 Prince Corporation Magnetic sensor mounting system
JPS6158142U (en) * 1984-09-25 1986-04-18
US4677381A (en) * 1984-10-19 1987-06-30 Prince Corporation Flux-gate sensor electrical drive method and circuit
JPH0749960B2 (en) 1984-12-28 1995-05-31 古野電気株式会社 Geomagnetic azimuth measuring device
JPH0682051B2 (en) 1986-08-19 1994-10-19 トヨタ自動車株式会社 Magnetization error correction method for azimuth detector
US4807462A (en) * 1987-04-03 1989-02-28 Chrysler Motors Corporation Method for performing automatic calibrations in an electronic compass
US4953305A (en) * 1987-05-27 1990-09-04 Prince Corporation Vehicle compass with automatic continuous calibration
US4851775A (en) * 1987-07-02 1989-07-25 Precision Navigation, Incorporated Digital compass and magnetometer having a sensor coil wound on a high permeability isotropic core
US4862594A (en) * 1987-11-04 1989-09-05 Donnelly Corporation Magnetic compass system for a vehicle
US4937945A (en) * 1987-11-04 1990-07-03 Donnelly Corporation Magnetic compass with optical encoder
US5090231A (en) * 1988-10-07 1992-02-25 Gallagher Lawrence W Electronic compass system
US5614885A (en) * 1988-12-05 1997-03-25 Prince Corporation Electrical control system for vehicle options
IL92239A (en) * 1989-11-07 1993-04-04 Israel State Magnetic compass
JPH03237312A (en) 1990-02-14 1991-10-23 Nissan Motor Co Ltd Azimuth meter for vehicle
US5455716A (en) * 1990-08-14 1995-10-03 Prince Corporation Vehicle mirror with electrical accessories
US5131154A (en) * 1990-10-15 1992-07-21 Donnelly Corporation Method and apparatus for compensating a magnetic compass
JP2870258B2 (en) 1991-10-14 1999-03-17 松下電器産業株式会社 Magnetization correction method for geomagnetic bearing sensor
US5239264A (en) * 1991-11-14 1993-08-24 Precision Navigation, Inc. Zero-offset magnetometer having coil and core sensor controlling period of an oscillator circuit
JPH05196468A (en) 1991-12-18 1993-08-06 Nissan Motor Co Ltd Azimuth meter for car
US5255442A (en) * 1991-12-20 1993-10-26 Donnelly Corporation Vehicle compass with electronic sensor
US5644851A (en) * 1991-12-20 1997-07-08 Blank; Rodney K. Compensation system for electronic compass
US5576687A (en) * 1991-12-20 1996-11-19 Donnelly Corporation Vehicle information display
US5323336A (en) * 1991-12-27 1994-06-21 Chrysler Corporation Noise removal method for an electronic compass
US5339529A (en) * 1992-12-14 1994-08-23 Prince Corporation Magnetic sensor mount
US5525901A (en) * 1993-02-02 1996-06-11 Beaudreau Electric, Inc. Sensor systems for monitoring and measuring angular position in two or three axes
US7209221B2 (en) * 1994-05-23 2007-04-24 Automotive Technologies International, Inc. Method for obtaining and displaying information about objects in a vehicular blind spot
US5511319A (en) * 1994-08-29 1996-04-30 Prince Corporation Vehicle compass correction circuit
US5808197A (en) * 1995-01-13 1998-09-15 Remec, Inc. Vehicle information and control system
US5737226A (en) * 1995-06-05 1998-04-07 Prince Corporation Vehicle compass system with automatic calibration
US5664335A (en) * 1995-06-06 1997-09-09 Prince Corporation Vehicle compass circuit
JP3751056B2 (en) 1995-08-31 2006-03-01 古野電気株式会社 Electronic compass
US5878370A (en) * 1995-12-01 1999-03-02 Prince Corporation Vehicle compass system with variable resolution
US5761094A (en) * 1996-01-18 1998-06-02 Prince Corporation Vehicle compass system
US6044315A (en) * 1996-06-13 2000-03-28 Prince Corporation Vehicle non-volatile memory system
US5924212A (en) * 1996-10-09 1999-07-20 Donnelly Corporation Electronic compass
US6084406A (en) * 1997-04-01 2000-07-04 Precision Navigation, Inc. Half-cycle saturable-core magnetometer circuit
US6356376B1 (en) * 1997-04-02 2002-03-12 Gentex Corporation Electrochromic rearview mirror incorporating a third surface metal reflector and a display/signal light
US6587573B1 (en) * 2000-03-20 2003-07-01 Gentex Corporation System for controlling exterior vehicle lights
US6192315B1 (en) * 1997-06-27 2001-02-20 Prince Corporation Dual-calibrated compass
US6087953A (en) * 1998-02-18 2000-07-11 Donnelly Corporation Rearview mirror support incorporating vehicle information display
US6054128A (en) 1997-09-29 2000-04-25 Wakat; Diane Dietary supplements for the cardiovascular system
US6047237A (en) * 1997-12-10 2000-04-04 Prince Corporation Compass precalibration method
US6170956B1 (en) * 1998-10-14 2001-01-09 Gentex Corporation Rearview mirror with display
JP2000131068A (en) 1998-10-23 2000-05-12 Citizen Watch Co Ltd Electronic declinometer and its correction value calculation method
US6166698A (en) * 1999-02-16 2000-12-26 Gentex Corporation Rearview mirror with integrated microwave receiver
US6023229A (en) * 1999-03-02 2000-02-08 Gentex Corp Rearview mirror with internally-mounted compass sensor
US6301794B1 (en) * 1999-05-27 2001-10-16 Johnson Controls, Inc. Vehicle compass system with continuous automatic calibration
US6418376B1 (en) * 1999-08-30 2002-07-09 Johnson Controls Technology Company Method and apparatus to maintain compass heading with a moveable sensor mounting
US6243660B1 (en) * 1999-10-12 2001-06-05 Precision Navigation, Inc. Digital compass with multiple sensing and reporting capability
US6262831B1 (en) * 1999-10-22 2001-07-17 Gentex Corporation Power supply for electrochromic mirrors in high voltage automotive power systems
US6980092B2 (en) * 2000-04-06 2005-12-27 Gentex Corporation Vehicle rearview mirror assembly incorporating a communication system
US6420800B1 (en) * 2000-05-25 2002-07-16 Gentex Corporation Rearview mirror with buttons incorporating display
US6407468B1 (en) * 2000-05-25 2002-06-18 Gentex Corporation Rearview mirror with buttons incorporating display
US6456194B1 (en) * 2000-09-21 2002-09-24 Craig D. Carlson Device and method for sensing and indicating inclination of an automotive vehicle
US6471362B1 (en) * 2000-10-13 2002-10-29 Gentex Corporation Mirror with improved button construction
US6543146B2 (en) * 2000-12-06 2003-04-08 Honeywell International, Inc. Electronic compass and compensation of large magnetic errors for operation over all orientations
US6539306B2 (en) * 2001-06-15 2003-03-25 Gentex Corporation Automotive mirror with integrated Loran components
US6651003B2 (en) * 2001-07-30 2003-11-18 Innovative Design Solutions, Inc. Method of automatic continuous calibration for an electric compass
US7149627B2 (en) * 2002-03-01 2006-12-12 Gentex Corporation Electronic compass system
WO2003105099A1 (en) 2002-06-06 2003-12-18 Donnelly Corporation Interior rearview mirror system with compass
US7023379B2 (en) * 2003-04-03 2006-04-04 Gentex Corporation Vehicle rearview assembly incorporating a tri-band antenna module

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EP1604171B1 (en) 2012-11-21
US20070124076A1 (en) 2007-05-31
WO2004076971A3 (en) 2008-02-21
CA2514154C (en) 2009-11-17
US20070288166A1 (en) 2007-12-13
EP1604171A2 (en) 2005-12-14
MXPA05008700A (en) 2005-10-05
WO2004076971A2 (en) 2004-09-10
US7379814B2 (en) 2008-05-27
KR20050113192A (en) 2005-12-01
EP1604171A4 (en) 2010-12-22
US20040254727A1 (en) 2004-12-16
KR101221435B1 (en) 2013-01-11
US7149627B2 (en) 2006-12-12
US7266452B2 (en) 2007-09-04

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