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7260896 |
Electronic compass and method of calibration
An electronic compass assembly includes a first collection portion and a second collection portion that each collect magnetic field data. The magnetic field data collected by the second collection...
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7248983 |
Electronic compass and method of controlling an electronic compass using independent calibration and compass heading modules
A method for controlling an electronic compass includes receiving raw magnetic field data into a calibration module and determining a calibration output based upon the raw magnetic field data. The...
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6877237 |
Method and system for acquiring calibration data for an electronic compass
A method and system is presented for acquiring calibration data for a three-axis electronic compass by positioning and rotating the compass so that each sensitive axis in the compass experiences...
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6853918 |
Electronic compass
An electronic compass comprises a saturable core sensor ( 2 ) with a core ( 3 ) made of ferromagnetic material surrounded by an electric winding ( 3 ′), a first couple of electric windings ( 4, 5...
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6768957 |
Electronic azimuth meter, correcting mechanism for electronic azimuth meter, and electronic timepiece having electronic azimuth meter
A correcting mechanism for an electronic azimuth meter has an X-direction magnetic sensor and a Y-direction magnetic sensor for detecting a magnetic field in two orthogonal directions X and Y and...
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6577976 |
Method for dynamic autocalibration of a multi-sensor tracking system and apparatus incorporating it therein
A method for dynamic auto-calibration of a multi-sensor tracking system and apparatus incorporating it therein are presented. The method and apparatus utilize information from complementary...
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6523271 |
Method of adjusting drive current of magnetism sensor and electronic azimuth meter
To reduce a dispersion in a sensitivity of a magnetism detecting circuit driving, by current, a magnetism sensor comprising magnetism resistance elements in a bridge constitution to a dispersion in...
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6356851 |
Accelerated calibration for electronic compass module
A system for calibrating an electronic compass for a vehicle of the type employing a Forward and Lateral magnetoresistive magnetic field sensor. As the vehicle changes headings, the system...
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6047237 |
Compass precalibration method
A method of installing a compass system includes the steps of mounting the electronic compass in a vehicle, coupling the electronic compass to a power source of the vehicle, downloading...
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5828984 |
Data processing method for an electronic compass system
A method for converting distorted compass data values into corrected data values which employs linear transforms. A linear transform is formulated and programmed into the read only memory of the...
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5761094 |
Vehicle compass system
A vehicle compass system having a magnetic field sensor coupled to a processing circuit which samples the sensor data and implements a calibration routine that generates compensation signals to...
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5390122 |
Method and apparatus for calibrating a vehicle compass system
A vehicle compass system that is adapted to be calibrated in the assembly plant during final assembly of the vehicle. In particular, two factory calibration modes are disclosed: an automatic...
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5351204 |
Scaling system and method for an electronic compass
A scaling system and technique which employs an analog-to-digital converter having at least 10-bit accuracy and a ranging circuit to compensate for abnormally large vehicle magnetic fields. The...
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5323336 |
Noise removal method for an electronic compass
A method for removing noise from data in an electronic compass system which discounts noise values or outliers (extreme headings far from average) by displaying median headings in the absence of a...
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5297065 |
Magnetic transient detection and calibration technique for an auto-calibrating compass
A magnetic transient detection technique which alerts a microcomputer of an auto-calibrating compass when electrical transients which produce magnetic transients have occurred. The technique...
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5297063 |
Method for selecting calibration data for an auto-calibrating compass
A method for selecting calibration data which uses mean square error to minimize variations in the calculated origins of the earth's magnetic field vector. A microcomputer having a memory...
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5287295 |
Method and apparatus for calibrating an electronic compass to account for alignment errors in the compass windings
An electronic compass (10) having at least two sense windings (11, 12) is mounted in a vehicle. The outputs (x(h), y(h)) of the windings are measured for a number of compass directions (headings)....
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5165269 |
Electronic flux gate compass calibration technique
An electronic flux gate compass calibration method and apparatus. An electronic flux gate compass mounted on a terrestrial vehicle is first rotated 360 degrees by driving the vehicle in a circle to...
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5095631 |
Magnetic compass
An electronic compass system for determining the heading of an armored vehicle containing a large mass of ferromagnetic material, which system comprises a plurality of sensors, and for real-time...
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5090231 |
Electronic compass system
A digital compass system for use in a wide variety of motor vehicle models, especially in the automotive aftermarket, and including various features which simplify installation and calibration by...
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5065521 |
Magnetic field measurement and compass calibration in areas of magnetic disturbance
A magnetic compass calibration system used in areas of magnetic disturbance. The invention allows the aircraft to remain in the hangar or hangar area while the aircraft's compass is compensated....
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5046031 |
Method and apparatus for automatic flux-gate compass calibration
A system for automatically compensating for changes in permanent magnetism in a vehicle in which a flux-gate compass is installed. Calibration is initially performed by rotating the vehicle through...
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4843865 |
Method of calibrating a compass heading
A method for compensating for pitch and roll misalignment in 3-axis magnetometer-type compasses wherein the magnetometer during factory calibration is subjected to magnetic fields corresponding to...
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4807462 |
Method for performing automatic calibrations in an electronic compass
The method and system described herein calls for the calibration of an electronic compass without using the operator of the vehicle in the process. This eliminates the need for the operator of the...
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4750349 |
Microcomputer controlled quick ranging technique and digital filter
A quick ranging technique controlled by a microcomputer, makes predetermined stepped adjustments to the charge times in a ranging circuit to bring the charge time into a required range, thusly...
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4720992 |
Calibration sequence and method for an electronic compass
A calibration sequence and method for use with an electronic compass which allows for the separation of the vehicle's magnetic field from the earth's magnetic field so that the earth's field can be...
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4622843 |
Simplified calibration technique and auto ranging circuit for an electronic compass control circuit
A technique is provided to combine software and hardware; the hardware being used to place voltage levels into narrow ranges and the software being used to perform the precise calibration.
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4622646 |
Arrangements for correcting compasses
A marine gyro compass output is corrected to take account of accelerations cting upon the ship in which it is installed by calculating about once per second a correction capable of expression by...
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4347730 |
Method and apparatus for calibrating gyroscopically-stabilized, magnetically-slaved heading reference system
A heading reference system mounted in a vehicle, e.g. an aircraft or a ta includes a magnetic compass and a gyroscope. The magnetic compass is subject to deviation in the magnetic field, hence the...
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4338810 |
Calibrator for a magnetic azimuth detector
A calibrator (FIG. 1) can calibrate a magnetic azimuth detector (18) of a craft (50). The service detector (18) is responsive to the magnetic field of the earth to provide a service heading signal....
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4325246 |
Compass checker
A device is disclosed for generating a rotatable magnetic field for calibing a compass. The field generated overcomes the earth's magnetic field and any other nearby magnetic field. A U-shaped...
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4143467 |
Semi-automatic self-contained magnetic azimuth detector calibration apparatus and method
Apparatus for calibrating the magnetic azimuth detector of a gyromagnetic compass system utilizes the system gyro to provide a plurality of heading references to which the corresponding heading...
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4031630 |
Calibration apparatus for automatic magnetic compass correction
Method and apparatus for providing calibration of automatic deviation-correction circuitry for a magnetic compass. Data representing deviation-corrections for respective compass headings are...
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3848455 |
MAGNETIC COMPASS CORRECTOR MEANS
A compass correction means for craft comprising a plurality of directionally set spaced markers representing true directions wherein said markers define an enclosure, having electronic signal means...
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3683668 |
COMPASS CALIBRATOR
A magnetic compass calibrator module, suitable for plug-in or integral operation with a vehicle compass system having a magnetic azimuth detector, measures and calibrates any magnetic error induced...
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3597089 |
TEST TABLE FOR A MAGNETIC COMPASS
The invention provides a test table for magnetic compasses. Reading errors which occur during a large number of readings necessary in testing accurately a magnetic compass are mitigated by using an...
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3530704 |
COMPASS COMPENSATION
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3522723 |
APPARATUS AND METHOD FOR CALIBRATING MAGNETIC COMPASSES
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3466923 |
APPARATUS FOR CALIBRATING COMPASSES
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3406560 |
Method and apparatus for compensating marine compasses
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3328881 |
Rapid inertial alignment method
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3320790 |
Structure for aiding compass compensation
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3253342 |
Compensated compass system
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3226971 |
Compass alignment system
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3218840 |
System and method for determining true magnetic bearings
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3071959 |
Method of measuring and compensating for deviation error in compass systems for maneuverable craft
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3028598 |
Azimuth transfer system
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2902641 |
Method of orientation of detector magnetometer element with high accuracy
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2887873 |
Method of measuring and compensating for deviation errors in earth's field sensitivedirection indicators
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