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7379814 |
Electronic compass system
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...
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7181857 |
Geomagnetic sensor for auto-calibration of magnetic field deviation and method of using the same
A geomagnetic sensor for auto-calibration of a deviation and a method of using the geomagnetic sensor. The geomagnetic sensor includes a geomagnetic detector including X-axis and Y-axis fluxgates...
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7168177 |
Method and apparatus for determining a geomagnetic field by using a compass and method and apparatus for determining an azimuth angle of a moving object using the same
There are provided a method and apparatus for determining a geomagnetic field by using a compass and a method and apparatus for determining an azimuth angle of a moving object using the method and...
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7168176 |
Geomagnetic sensor for informing users whether detected azimuth angle is acceptable, and a method thereof
A geomagnetic sensor which informs a user that information with respect to a distorted azimuth angle may be detected. The geomagnetic sensor includes a geomagnetism detection module including an X...
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7134213 |
Magic compass
A magic compass that gives the illusion it defies the laws of nature, providing usage as an aid for locating the direction of prayer as well as a novel promotional device for companies, having a...
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7127369 |
Sensor assembly
A system with a sensor assembly is used to determine direction of movement of an object so that accuracy of position calculation is improved. The sensor assembly measures at least two operational...
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7053608 |
Magnetometer having a dynamically adjustable bias setting and electronic vehicle compass incorporating the same
According to some embodiments of the present invention, a magnetometer includes at least one sensor for sensing a magnetic field component, a biasing circuit, and a processor. The sensor generates...
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6972563 |
Method of adjusting a fluxgate magnetometer apparatus
A single-axis, fluxgate magnetometer apparatus comprises: an excitation subassembly comprising a toroidal core wound with a predetermined number of turns of an excitation coil; and a pick up...
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6831457 |
Two-dimensional magnetic sensor including magneto-impedance sensor elements
The present invention is a two-dimensional magnetic sensor having a first magneto-impedance sensor element including a first magneto-sensitive element and a first electro-magnetic coil which is...
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6771066 |
Printed circuit fluxgate sensor for magnetic gradient detection device
A printed circuit fluxgate sensor for use in magnetic gradient detection devices and the like includes a highly magnetically saturable core formed as a flat, closed loop that is bonded between two...
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6760678 |
Electronic compass
A method and system for continuously and automatically calibrating the settings of an electronic compass, as needed, while a vehicle moves from place to place is shown. The calibration technique of...
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6566856 |
Closed-loop magnetoresistive current sensor system having active offset nulling
A magnetoresistive sensor system having resistive elements changing in ohmic value in the presence of a magnetic field of a current being measured. The variant values of the elements are amplified...
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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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6512370 |
Low power, frequency-mode magnetometer
A low power, frequency-mode magnetometer. The magnetometer includes an LC oscillator, a bias resistor and a polarity switch. The LC oscillator produces an output signal having a variable frequency...
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6502014 |
Regulating circuit for regulating the driving stability of a motor vehicle using a motor vehicle reference model
The present invention relates to a control circuit for controlling the driving stability of a vehicle where the input quantities determining the course of track are input in a vehicle model circuit...
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6466871 |
Method for calibrating and verifying the attitude of a compass
A method for calibrating the attitude of a compass in relation to the platform on which the compass is installed. The compass includes an attitude determining device and an optical sighting device...
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6427349 |
Compensation system for electronic compass
An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias...
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6407547 |
Biaxial flux gate type magnetic sensor
A biaxial flux gate type magnetic sensor has a core which is made of a magnetic thin film in the shape of a loop, patterned upper and lower electrically conductive thin-film layers respectively...
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6380735 |
Orthogonal flux-gate type magnetic sensor
A magnetic sensor of orthogonal flux-gate type is provided with a cylindrical core made of a soft magnetic material; an internal conductor that is placed inside the core; a detection coil wound up...
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6282803 |
Self calibration circuit for determining an accurate zero compensation for a fluxgate compass
A self calibrating zero compensation circuit for a fluxgate compass comprising a toroidal core; a drive winding coupled to said core, and at least one and preferably two secondary sensing windings...
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6222363 |
Switch-mode flux-gate magnetometer
A flux gate inductor responsive to an external magnetic field produced by a rotating magnetoelastic sleeve and oscillating voltage applied to the flux gate inductor induces a field in the flux gate...
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6218831 |
Low power fluxgate circuit with current balance
The present invention is a system for cyclically driving an electrical current through at least one non-linear (i.e., saturable) inductor in alternating directions so as to produce a substantially...
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6181130 |
Magnetic sensor having excitation coil including thin-film linear conductor sections formed on bobbin with detection coil wound thereon
A magnetic sensor includes a bobbin having one surface provided with a toroidal groove, and a toroidal inductor accommodated in the groove. The toroidal inductor has a toroidal core and an...
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6141881 |
Electronic analogue compass
An compass having an electronic magnetic field sensor and an analog directional display is disclosed wherein a signal from the field sensor proportional to one component of the earth's magnetic...
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6084406 |
Half-cycle saturable-core magnetometer circuit
A magnetic field sensor element comprises an elongated core of high-magnetic permeability material having a coil of electrically-conductive wire wound around and along a central axis of the core....
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6070333 |
Electronic compass
An electronic compass has a compass housing. An electronic magnetic field sensor is disposed in a fixed position relative to the compass housing. A magnet is rotatably mounted relative to the...
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6044315 |
Vehicle non-volatile memory system
An electronic vehicle accessory includes a non-volatile memory, and a controller coupled to the non-volatile memory and to a speed sensor of the vehicle for receiving speed data representing the...
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6014025 |
PWM flux-gate circuit for measuring magnitude and direction of a magnetic field
A Micro-Powered Flux-Gate Magnetometer is provided for measuring the strength and direction of external magnetic fields. The magnetometer includes a saturable core inductor, or flux-gate positioned...
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5850624 |
Electronic compass
An electronic compass (10) for use in a boring tool (12) which will provide an orientation of the boring tool relative to the earth's magnetic field. In addition, a more straightforward left or...
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5757184 |
Magnetic field detection apparatus with bilateral electrical switch for inverting magnetic sensor current
A magnetic detection apparatus is disclosed, the size and cost of which can easily be reduced and with which excellent sensitivity can be obtained. The magnetic detection apparatus according to the...
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5749150 |
Direction indicator for navigation
An electronic audio/visual direction indicator for underwater or other types of navigation which gives unobtrusive and continuous directional feedback without the need for manual manipulation.
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5672967 |
Compact tri-axial fluxgate magnetometer and housing with unitary orthogonal sensor substrate
A tri-axial fluxgate magnetometer and housing therefor that includes elements which facilitate a small sized, relatively low cost magnetometer assembly without sacrificing accuracy and reliability....
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5655308 |
Illuminating navigation device
An electronic audio/visual direction indicator for underwater or other types of navigation which gives unobtrusive and continuous directional feedback without the need for manual manipulation.
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5652512 |
Advanced digital flux gate magnetometer
Digital logic comprising a high speed analog to digital converter, a high speed analog to digital converter, a digital multiplier, and an infinite impulse response filter and decimation circuit are...
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5581899 |
Process for compensating a magnetic interference field in a vehicle
Process for compensating a magnetic interference field in a vehicle having a navigation installation. During a calibration run for initial compensation, a first set of interference field parameters...
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5564194 |
Geomagnetic direction sensor
A geomagnetic direction sensor has a substrate, at least two magneto-resistive effect devices and a coil for generating the bias magnetic field. The substrate retains shape symmetry when rotated...
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5560115 |
Gimbaled magnetometer with inductive coupling
An apparatus for mounting a magnetometer including a frame and a platform mounted for rotation within the frame. The magnetometer and one or more counterweights are mounted within the platform such...
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5481808 |
Vehicle orientation sensor and method with magnetic stabilization
A device for determining the orientation of a vehicle includes a magnetic field sensor (3) which is arranged in the vicinity of a ferromagnetic outer wall of the body of the vehicle and which is...
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5444916 |
Electronic stereo clino-compass
An electronic stereo clino-compass which can be targeted directly at the discontinuous surface of a soil layer and in particular, where the running direction (azimuth) and inclination of a target...
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5435070 |
Simplified compass with multiple segment display capability
An apparatus for determining the direction of a magnetic field is provided with a plurality of magnetically sensitive components arranged with their sensing axes equally spaced around a circular...
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5418460 |
Compact triaxial AC magnetic field analyzer/dosimeter using swept bandpass filters
A triaxial AC magnetic field analyzer/dosimeter instrument measures the field strength of three mutually orthogonal AC magnetic field components at a plurality of different frequencies in a...
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5394029 |
Geomagnetic orientation sensor, means, and system
The Geomagnetic Orientation Sensor is a device used to determine the orientation of objects with respect to the magnetic field surrounding the earth. The sensor may also be used to determine...
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5353241 |
Shifting system and method for an electronic compass system
A shifting compensation circuit which employs a ranging circuit having a variable direct voltage source, to compensate for abnormally large vehicle magnetic fields. A ranging circuit is coupled...
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5339529 |
Magnetic sensor mount
A magnetic sensor mounting assembly embodying the present invention includes a base plate having cradles for pivotally receiving and adjustably locking a sensor supporting platform thereto. The...
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5287628 |
Omni range inclino-compass
A solid-state omni range incline-compass having a gravity sensor and a geomagnetic flux sensor provided on, each of three orthogonal axes established on a moving body a unit for generating a...
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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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5282318 |
Position sensor
A position sensor has a ring of a material of high permeability that is floated on a liquid within a hermetically sealed toroid, so as to hold the ring in a horizontal position. Exciting coils are...
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5269065 |
Compass including means for displaying constellation data
A compass wherein positional information regarding a predetermined terrestrial location is stored; present time, corresponding to the terrestrial location whose positional information is stored, is...
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5255442 |
Vehicle compass with electronic sensor
An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias...
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5253424 |
Flux-gate sensor mounting and method
A flux-gate sensor orientation method which minimizes display jitter in electronic compasses which employ an n-point display or which calculate headings using the arctangent method. The method...
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