According to an example aspect of the present invention, there is provided a method and system for determining and tracking an indoor position of an object, the method comprising: using a primary position indication, based on signals received from an external positioning system of at least two different positions of said object to calibrate tracking of a secondary position indication, which is an indoor position, and wherein the tracking of the secondary position comprises: recording acceleration data of a second part of the object, integrating said acceleration data, determining a characteristic position of the cyclically moving second part of the object in subsequent cycles, measuring a geomagnetic first orientation of the second part of the object in said characteristic position, determining the second direction of movement of the first part of the object, computing a velocity of the object in any direction based on the acceleration data, and determining the secondary position indication of said object based on said direction data and said velocity data.

According to an example aspect of the present invention, there is provided a method and system for determining and tracking an indoor position of an object, the method comprising: using a primary position indication, based on signals received from an external positioning system of at least two different positions of said object to calibrate tracking of a secondary position indication, which is an indoor position, and wherein the tracking of the secondary position comprises: recording acceleration data of a second part of the object, integrating said acceleration data, determining a characteristic position of the cyclically moving second part of the object in subsequent cycles, measuring a geomagnetic first orientation of the second part of the object in said characteristic position, determining the second direction of movement of the first part of the object, computing a velocity of the object in any direction based on the acceleration data, and determining the secondary position indication of said object based on said direction data and said velocity data.

A method for compensating a magnetic heading includes one or more of obtaining a magnetic heading from a magnetic instrument deployed with an apparatus, determining location data for the apparatus, determining local field data based on the location data, obtaining a magnetic profile for the magnetic instrument deployed with the apparatus, and compensating the magnetic heading based the magnetic profile. For example, the magnetic profile may be responsive to perturbation of the local geomagnetic field by the apparatus, so that the compensated heading is more responsive to a directional heading of the apparatus, when deployed in the geomagnetic field. An apparatus for performing the method is also described, along with another method for calibrating the magnetic instrument when deployed with the apparatus, in order to generate the magnetic profile.

A method for compensating a magnetic heading includes one or more of obtaining a magnetic heading from a magnetic instrument deployed with an apparatus, determining location data for the apparatus, determining local field data based on the location data, obtaining a magnetic profile for the magnetic instrument deployed with the apparatus, and compensating the magnetic heading based the magnetic profile. For example, the magnetic profile may be responsive to perturbation of the local geomagnetic field by the apparatus, so that the compensated heading is more responsive to a directional heading of the apparatus, when deployed in the geomagnetic field. An apparatus for performing the method is also described, along with another method for calibrating the magnetic instrument when deployed with the apparatus, in order to generate the magnetic profile.

An increase in power consumption involved in calibration for calibrating an offset of a geomagnetism sensor is suppressed. An electronic device performs calibration of an output error of the geomagnetism sensor so that the geomagnetism sensor can output more accurate geomagnetism data based on angular speed data output by a gyro sensor. The electronic device controls turning ON/OFF of the gyro sensor. The electronic device determines whether or not calibration of the geomagnetism sensor is necessary. When it is determined that calibration of the geomagnetism sensor is unnecessary, the electronic device performs a control operation to turn OFF the gyro sensor.

An increase in power consumption involved in calibration for calibrating an offset of a geomagnetism sensor is suppressed. An electronic device performs calibration of an output error of the geomagnetism sensor so that the geomagnetism sensor can output more accurate geomagnetism data based on angular speed data output by a gyro sensor. The electronic device controls turning ON/OFF of the gyro sensor. The electronic device determines whether or not calibration of the geomagnetism sensor is necessary. When it is determined that calibration of the geomagnetism sensor is unnecessary, the electronic device performs a control operation to turn OFF the gyro sensor.

Systems, methods, and apparatuses for a self-locating compass for use in navigation are disclosed. The self-locating compass is operable to provide position and/or velocity without information from a global positioning system (GPS) device. The self-locating compass includes a direction finder and a Lorentz force detector. The method includes determining orientation with respect to Earth's magnetic field, measuring a Lorentz force proportional to rate of change of location with respect to the field, determining a change in location, and updating location.

Systems, methods, and apparatuses for a self-locating compass for use in navigation are disclosed. The self-locating compass is operable to provide position and/or velocity without information from a global positioning system (GPS) device. The self-locating compass includes a direction finder and a Lorentz force detector. The method includes determining orientation with respect to Earth's magnetic field, measuring a Lorentz force proportional to rate of change of location with respect to the field, determining a change in location, and updating location.

Sensor modules for measuring parameters such as magnetic fields, tilts, orientation, or other parameters in high resolution in three orthogonal axes using single-axis sensor arrays are disclosed.

An electronic device includes a first housing, a second housing, a rollable display, a magnetic sensor, and a processor. The magnetic sensor is disposed at a first position in the second housing coupled with the first housing in a first state. The magnetic sensor is configured to move from a first position to a second position based on a movement of the second housing in the first state so that the first housing and the second housing are coupled in a second state and to move from the second position to the first position based on a switching from the second state to the first state. The processor is configured to: electrically connect to the magnetic sensor, obtain geomagnetic data based on a movement of the magnetic sensor, and obtain correction data based on the obtained geomagnetic data.