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| Number | Title | Issue Date |
| 7353614 | Vehicle compass system with continuous automatic calibration The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criteria. One suc... | 04/08/2008 |
| 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 portion partially overlaps the magnetic field data collected by the f... | 08/28/2007 |
| 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 raw magnetic field data is also received into a compass heading modul... | 07/24/2007 |
| 7225551 | Electronic compass and method for tracking vehicle rotation An example method for controlling an electronic compass includes determining compass tracking angles in a coordinate system for magnetic field data points that correspond to magnetic field sensor signals produced as a vehicle rotates relative to a surrounding magnet... | 06/05/2007 |
| 7197343 | Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus A portable phone has a CPU and a magnetic sensor unit including an X-axis magnetic sensor, a Y-axis magnetic sensor, and a temperature sensor. CPU measures at first and second temperatures the influence of a magnetic field of permanent magnets upon an output Sx of t... | 03/27/2007 |
| 7123006 | Sensing apparatus having fluxgate and control method thereof In a sensing apparatus, and a control method of a sensing apparatus, the sensing apparatus includes a fluxgate including a driving coil for exciting a magnetic substance core with a current, first and second current amplifiers for applying the current to first and s... | 10/17/2006 |
| 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 variation in the magnetic field while rotating the compass. Acquiring t... | 04/12/2005 |
| 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 for calculating an azimuth of a main body of an electronic azimuth met... | 07/27/2004 |
| 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 sensors, filtered by a simultaneously running filter that combine... | 06/10/2003 |
| 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 a sensitivity of a magnetism sensor. An electronic azimut... | 02/25/2003 |
| 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 periodically samples and digitally stores the peaks of the sensor ... | 03/12/2002 |
| 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 precalibration data into the electronic compass after the electronic ... | 04/04/2000 |
| 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 microcomputer of the electronic compass system. The microcom... | 10/27/1998 |
| 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 compensate the sensor for the effects of vehicular magnetism ... | 06/02/1998 |
| 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 factory calibration mode wherein the calibration sequence is aut... | 02/14/1995 |
| 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 ranging circuit employs variable resistance negative feedback... | 09/27/1994 |
| 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 clear trend in the direction of change of sampled headings... | 06/21/1994 |
| 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 calculates and stores the origin of the earth's magnetic field vect... | 03/22/1994 |
| 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 employs an electronic compass control circuit having a sampling ... | 03/22/1994 |
| 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). From this data an error difference angle ($c;), from a ... | 02/15/1994 |
| 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 determine four reference points where the locus of points... | 11/24/1992 |
| 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 computation of the corrections required of actual magnetomet... | 03/17/1992 |
| 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 non-professionals. A knowledge of magnetic direction is not... | 02/25/1992 |
| 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. The invention compensates for time variances in ambient magn... | 11/19/1991 |
| 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 a full circle and determining from the flux-gate outputs ... | 09/03/1991 |
| 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 at least two different latitudes, and correction coefficie... | 07/04/1989 |
| 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 vehicle to help to supply information relating to the eart... | 02/28/1989 |
| 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 minimizing calibration time for an electronic compass; a digit... | 06/14/1988 |
| 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 measured and used to give vehicle direction; such calibra... | 01/26/1988 |
| 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.... | 11/18/1986 |
| 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 differential equations which are solved by numerical methods ... | 11/11/1986 |
| 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 system must be calibrated. If the vehicle is oriented in ... | 09/07/1982 |
| 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. The calibrator includes a test detector (10) for providin... | 07/13/1982 |
| 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 housing has a first calibrated dial on the top horizontal mem... | 04/20/1982 |
| 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 outputs of the magnetic azimuth detector are compared to prov... | 03/13/1979 |
| 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 derived by comparing signals representative of the actual headin... | 06/28/1977 |
