The present invention relates to a MEMS gyrocompass, a method performed by the MEMS gyrocompass and a computer program product. The MEMS gyrocompass mitigates systematic error in determination of a north angle. The MEMS gyrocompass comprises at least one MEMS gyroscope having a sense axis within a…
A heading and attitude correction method and a heading and attitude correction system (100) are provided. The method includes: obtaining attitude data in a period of time; performing a linear regression analysis on the attitude data and time points in the time period to obtain a regression line (L)…
Ce procédé comporte une première étape (41) d'obtention de premières valeurs de coefficients de compensation de défauts magnétiques du magnétomètre, et une deuxième étape d'affinage en vol comprenant : - a) une acquisition (42) d'une pluralité de valeurs de vecteurs de champ magnétique et de…
A calibration method for an electronic compass includes: acquiring an initial sphere center coordinate of a current calibration; acquiring a preset number of magnetic field data collected by a magnetic sensor; determining a target magnetic field interference level of an environment according to the…
The disclosure describes a method for calibrating a magnetic sensor of a client device. The method may include receiving a set of magnetic field measurements, each of which includes a device location, an orientation of the client device, and an observed magnetic field vector measured by the…
Calibrating an unstable sensor of a mobile device. Systems and methods for calibrating a sensor of a mobile device determine a first estimated position of the mobile device without using any measurement from the sensor of the mobile device, generate a second estimated position of the mobile device…
Calibrating a pressure sensor of a mobile device includes determining a first plurality of calibration values for a first plurality of visits to a first revisit zone to which a mobile device repeatedly returns; determining a first relative calibration adjustment value based on the first plurality…
A drilling system includes a method of determining an orientation of a drill string in a borehole. Sensor readings of a magnetic field of a drill bit are obtained at a plurality of positions along a curve extending around the drill bit along a longitudinal bit axis from a first location to a second…
An electronic device includes sensors, a display, and a processor electrically connected to the sensors and the display, in which the electronic device is in a first running mode for permanently providing compass information or a second running mode for providing the compass information, in…
A compensation method for a magnetic field on board a vehicle including the steps carried out by computer and consisting of: for each measuring time T, i=1 to N with N>1, collecting the measured values of the 3D magnetic field Hmand those of the angles θand φ, where θis the pitch of the vehicle φis…
An offset estimation device (40) includes a rotation axis calculation part and an offset estimation part. The rotation axis calculation part is configured to: obtain multiple sets of magnetic data detected by the magnetic sensor (20) and multiple sets of angular velocity data in accordance with the…
A method of calibrating a vehicle's heading system, such as the attitude heading and reference system of an aircraft or the heading system of a ship, positioned along the Earth's surface involves obtaining both actual and theoretical readings for the magnetometer of the heading system, and…
A method of indicating an interference magnetic field at an electronic device (100) includes: displaying a first arrow (206) indicating a direction of magnetic north on a display (112) of the electronic device, the direction of the first arrow (206) corrected to remove interference caused by an…
Disclosed are methods and systems for stabilizing orientation values of an electronic device, the orientation values representing an orientation of the electronic device, the method comprising: obtaining first sensor readings from a first sensor; obtaining second sensor readings from a second…
The embodiments of the present invention disclose a method for correcting an orientation of a magnetometer and a magnetometer, and relate to the field of positioning technologies and solve the problem that in the process of correcting an orientation of a magnetometer, a geomagnetic inclination…
A system comprises a plurality of reference navigation systems, each reference navigation system configured to generate a respective reference navigation solution. The system also comprises a test navigation system, the test navigation system configured to generate a test navigation solution; and a…
A method and system for compensating for significant soft iron magnetic disturbances in a heading reference system, such as an aircraft heading reference system, such as an integrated standby unit; or a vehicle inertial system, provides a heading correction signal to the heading reference system…
Systems and methods described herein relate to the correction of positional vector-valued sensors using a variety of calibration processes including fixed-angle calibration, known-angle calibration, ortho-calibration and 3-axis gimbal calibration further including various weighting schemes to…
A method and system are provided for determining a magnetic field using a mobile device. The method includes determining location information of the mobile device, obtaining magnetic field data based on the location information, determining orientation information of the mobile device and applying…
Systems and methods are provided for selecting landmarks for navigation. In one embodiment, a system comprises an IMU that provides inertial measurements for a vehicle and at least one image sensor that acquires measurements of the vehicle's environment. The system also comprises a processing unit…
A geomagnetic application device comprising a triaxial magnetic sensor, a measurement point acquiring means, a calibration means for calibrating offset of the magnetic sensor, and an azimuth calculation means, is provided. The geomagnetic application device is characterized in that the calibration…
A mobile terminal with electronic compass is provided with a first housing that houses a geomagnetic sensor, a second housing connected to the first housing, with relative position thereto being variable, a state detection unit that detects a relative position state between the first housing and…
Methods and apparatus employing non-magnetometer navigational sensor data to assist in determining whether a change in a magnetic field detected by a magnetometer is likely due to a source of internal or external magnetic interference, and more generally, whether such interference is likely to be…
Method, means, portable terminal accessory and system for calibrating a sensor device comprising a positioning unit detecting the position of the electronic device, an image capturing unit capturing an image of the environment around the electronic device, a processing unit detecting the presence…
A base unit (10) includes a sensor calibration function (36). When a user communicatively couples a consumer electronic device (50; 90) having a sensor (62, 92) to the base unit (10), a controller (24; 52) at the base unit (40) retrieves a calibration reference value for the sensor (62, 92) and/or…
The method involves using a triaxis sensor that is fixed to a mobile object i.e. catheter, and measuring a vector that gives direction of field of physical quantity at a measurement point in a mobile referential system. A set of scalar and vector products of a set of normalized vectors is utilized…
In a geomagnetism measurement apparatus, a magnetic sensor detects magnetic data, and a storage unit stores the magnetic data sequentially output from the magnetic sensor. An ellipsoid generation unit calculates each ellipsoidal central point of first, second and third ellipsoids each of which has…
Even if a measurement data group is not a measurement data group that is obtained in a space where the magnitude of a vector physical quantity to be measured is uniform, an offset with high reliability is estimated. The reliability of the estimated offset is further improved. A vector physical…
A system and method of obtaining magnetometer readings for performing a magnetometer calibration are provided. The method comprises detecting initiation of a magnetometer calibration; displaying a plurality of visual elements representing at least a pair of movements, each of the movements…
A geomagnetic field measurement device has a three-dimensional magnetic sensor and a storage device that stores plural pieces of magnetic data sequentially output from the three-dimensional magnetic sensor. The geomagnetic field measurement device calculates, based on the pieces of magnetic data, a…