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| Number | Title | Issue Date |
| 7412775 | Gyroscope north seeker system and method A sensor system and method for determining a relative direction to true north is provided. The system comprises at least one angular rate sensor, such as a MEMS sensor, which has an input axis and a rotation axis. The sensor comprises a motor drive structure, a moto... | 08/19/2008 |
| 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 |
| 7337549 | Input device for using geomagnetic sensor and a method thereof for generating input signal An input device using a geomagnetic sensor includes a geomagnetic sensor outputting a voltage corresponding to geomagnetism, and a control part calculating an azimuth using the voltage output from the geomagnetic sensor and calculating the rotation angle by comparin... | 03/04/2008 |
| 7325320 | Method for estimating the accuracy of azimuthal orientations and portable sighting device In a method according to the invention for estimating the accuracy of azimuthal orientations (a) of a measuring device (1) having an electronic magnetic compass (2), a plurality of determinations of an azimuthal orientation (a, a′, a″, a′″, aâ€... | 02/05/2008 |
| 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 |
| 7210235 | Apparatus and method for detecting azimuth and inclination angle, program for detecting the same, and portable terminal device for detecting the same In an azimuth/inclination-angle detection apparatus, a measurement data obtaining unit obtains first and second measurement data sets g and h from acceleration and magnetic sensors, respectively. A first computation unit calculates an azimuth α0, an elevatio... | 05/01/2007 |
| 7162807 | Geomagnetic sensor having a dip angle detection function and dip angle detection method therefor A geomagnetic sensor supporting a dip angle detection function. The geomagnetic sensor includes a rotation angle measurement part for measuring pitch and roll angles of the main body with respect to the surface of the Earth; a geomagnetic measurement module for outp... | 01/16/2007 |
| 7086164 | Method and device for measuring directional, and computer program A method for measuring a directional of a body in a three-dimensional space defined by an X-axis (magnetic north), a Y-axis, and a Z-axis is proposed. A geomagnetic force along an x-axis, which is the direction towards which the body points and an x-axis tilt angle,... | 08/08/2006 |
| 6915584 | Compass with electromagnetic half-shell transformer energy transmission and optoelectronic data signal transmission The invention concerns a compass having an electro magnetic half-shell transformer energy transmission and opto electronic data transmission. To avoid a slipring connection during the transfer of supply voltage at least one winding on the primary half-shell is conne... | 07/12/2005 |
| 6842991 | Gyro aided magnetic compass An improved method, system, and device for a compass combining an electronic magnetic compass and an angular velocity sensing gyroscope. One aspect of the invention integrates an angular velocity output signal from an angular velocity sensor or rate gyroscope to det... | 01/18/2005 |
| 6425187 | Gyro-sensor A locating device for vehicles with a carrier to be mounted in the vehicle in which a gyro-sensor is located to detect the movement of moving components for the purpose of determining the location. As gyro-sensors must be oriented a certain way in order t... | 07/30/2002 |
| 5771596 | Container for liquids including a level control and a gyro compass A first liquid container has therein a level control including a float valve, a storage tank or second container and a third container having therein a liquid which is maintained at a fixed liquid level. The third container is connected to the liquid in t... | 06/30/1998 |
| 5408751 | High resolution gyro system for precise angular measurement The system includes for planar angular measurements a gyro--preferably a laser gyro--and an angle encoder mounted with their sensitive axes coaxially on a turntable shaft, which is rotatably mounted in a case and driven at constant speed with respect to s... | 04/25/1995 |
| 5349757 | Tape-suspended meridian gyro A tape-suspended meridian gyro has an outer housing, an intermediate housing movably mounted in the outer housing and a gyro having substantially horizontal spin axis. The gyro is suspended by means of a tape within the intermediate housing. A pick-off de... | 09/27/1994 |
| 4977679 | Azimuth signal generator In an azimuth signal generator for an automobile navigation system a change in the rotational rate of an inertia rotary member, which has its rotary shaft held vertically and is driven at substantially a constant speed, is detected as a direction changing... | 12/18/1990 |
| 4811233 | Cost-optimal state feedback controller for all-attitude gimbal system An improved cost-optimal state feedback control system for stabilizing the nertial reference platform in all-attitude inertial guidance systems which uses the "region" control concept. It reduces the computational requirements of cost-minimizing state feed... | 03/07/1989 |
| 4709486 | Method of determining the orientation of a surveying instrument in a borehole A method of determining the orientation of a surveying instrument in a borehole from measurements of the earth's gravitational and magnetic fields wherein the azimuth angle is calculated directly without correcting an apparent azimuth. Those measurements ... | 12/01/1987 |
| 4603483 | Thermal gradient compensator for fluid rotor gyroscopic apparatus A fluid sphere gyroscope is used as the north-seeking sensing element in a gyrocompass. A sensor responsive to angular deviation of the gyroscope from the horizontal provides a tilt signal which is used to energize heating elements located along the indep... | 08/05/1986 |
| 4599803 | Heading indicator and method of using A heading indicator is disclosed which utilizes a one degree of freedom platform stabilized by a two degree of freedom dry flexure gyro. The output of one of the sensitive axis is coupled through an amplifier to the corresponding torquer in the gyro and s... | 07/15/1986 |
| 4379365 | Gyrocompass A gyrocompass including a first gimbal, a gyro motor mounted in the first gimbal and including a gyro rotor mounted to rotate about a horizontally alignable spin axis, a pendulous body in which the first gimbal is mounted to be rotatable about a verticall... | 04/12/1983 |
| 4224573 | Electric circuit device and pendulum unit incorporating such devices An electrical circuit device comprises an integrating amplifier arrangement that provides a circuit output signal in response to an input signal from a differential amplifier. The differential amplifier receives at one of its input terminals the circuit i... | 09/23/1980 |
