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| Number | Title | Issue Date |
| 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 magnetic field sensor and independently aligned with a terrestr... | 06/06/2000 |
| 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 that gravity acting on the counterweights maintains the m... | 10/01/1996 |
| 4916393 | Continuous vectorial magnetometer with capacitive magnetostriction pickup and gradiometer involving the application of this pickup Continuous vectorial magnetometer having a magnetostrictive pickup including a capacitive pickup which contains a capacitor at least one of whose electrodes is constituted of a material having magnetostrictive properties, and means for measuring the varia... | 04/10/1990 |
| 4794703 | Navigational instrument for controlling the stability of a mobile device The invention relates to a navigational instrument for automatically controlling the stability of a mobile target, or locating the position of the target with respect to one of several reference planes. The arrangement includes a moving part A whose base ... | 01/03/1989 |
| 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 |
| 4739263 | Magnetic sensor using the earth's magnetism A direction sensor includes at least one sensor element including a ring-shaped core formed from at least one flexible wire made of zero-magnetostrictive amorphous magnetic material, two pairs of series connected coils spaced from each other at equal inte... | 04/19/1988 |
| 4680866 | Magnetic flux detector correction system An aircraft heading correction system utilizing the horizontal field strength of the earth's magnetic field to determine the tangent of the dip angle generally associated with a given field strength. The tangent of the dip angle is then used to generate a... | 07/21/1987 |
| 4677754 | Multiplexing of a bandpass filter circuit to work with a flux-gate sensor output Multiplexing a bandpass filter circuit to work with a flux-gate sensor output to minimize the amount of electronic circuitry required to work with the control system and to reduce the effect of gain on the circuit by emphasizing repeatability.... | 07/07/1987 |
| 4640016 | Means for indicating direction and a method of determining a direction A remote indication compass, a sensor of which is formed by a magnetic compass (1) and magnetoresistive sensors (2) attached thereto, by means of which sensors the field created by the magnetic compass is measured. The signal of the sensors is analogous a... | 02/03/1987 |
| 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 |
| 4616424 | Magnetic direction sensor A magnetic direction sensor having a head constituted by a magnetic wound core composed of a ferromagnetic metal ribbon; a winding for exciting the magnetic wound core; a first output winding wound around the core such that it encircles two opposite porti... | 10/14/1986 |
| 4590679 | Compass systems A drive circuit applies an oscillating signal to the drive coil of the fluxgate thereby generating output pulses from the detection coils of the fluxgate, which pulses have an area proportional to the magnetic flux through that coil. The output pulses are... | 05/27/1986 |
| 4462165 | Three axis orientation sensor for an aircraft or the like A three axis orientation sensor for sensing the orientation of an attached object such as an aircraft with respect to the earth's magnetic field. The sensor can be aligned and used in the presence of ferrous materials and magnetic fields which are inheren... | 07/31/1984 |
| 4445279 | Magnetic course detector Disclosed is a magnetic course detector capable of accurately detecting the bearing of the course of a traveling body independently of the position a magnetic bearing sensor is installed in the traveling body through rotatably mounting the magnetic bearin... | 05/01/1984 |
| 4430803 | Circuit for levitated ball inclinometer An inclinometer has a ferromagnetic ball levitated between pairs of electromagnets. When the inclinometer changes attitude, the ball moves in response to the change in relative gravity direction. Alternating currents are applied to the proper electromagne... | 02/14/1984 |
| 4424631 | Electrical compass A magnetic field detecting system for use with a flux-gate sensor includes an oscillator, the output of which is applied to a digital bandpass filter and frequency divided and also applied to the sensor, and phase detectors such that the frequency and pha... | 01/10/1984 |
| 4413424 | Azimuth determinating apparatus An azimuth determinating apparatus wherein the azimuth sensor is oriented to a specified direction, and the deviation of the two-component detection signals of the azimuth sensor from the pointing direction of the azimuth sensor are corrected by the adjus... | 11/08/1983 |
| 4398353 | Compass data converter The peaks of synchro or step data representative of compass heading are detected and the resulting logic levels are latched into a register by an enable pulse generated in response to the data itself. Three outputs from the register are fed directly to th... | 08/16/1983 |
| 3937078 | Sensing apparatus for inclinometers An apparatus for sensing the orientation of an inclinometer in both direction and magnitude for determining the velocity and direction of currents in a body of water having a magnetic north seeking sphere buoyantly supported in a housing. Implanted on the... | 02/10/1976 |
