Systems and methods for determining azimuth of a wellbore while drilling. A method of drilling a wellbore that includes rotating a drill bit to extend the wellbore into a subterranean formation. The method may further include measuring magnetic toolface with a first magnetometer while rotating the drill bit. The method may further include obtaining a cross-axial magnetic field measurement. The method may further include determining azimuth at a point in the wellbore using at least the magnetic toolface and the cross-axial magnetic field measurement. The method may further include using the azimuth as feedback in the drilling the wellbore.

A foldable mobile terminal apparatus and control method are provided. The apparatus includes a first section, a second section coupled to the first section and movable between a folded state and an unfolded state including a plurality of partially folded states, a flexible display coupled to the first and second sections, a first sensor, and at least one processor to, while the mobile terminal apparatus is partially folded, identify one of the partially folded states of the mobile terminal apparatus, and control the display to display information corresponding to a compass direction based on magnetic related information obtained by the first sensor and according to the identified partially folded states. The electronic device can prevent distortion of the first sensor caused by the display by calibrating the geomagnetic value of the sensor based on an angle between a first surface of a first section and a third surface of the second section.

A foldable mobile terminal apparatus and control method are provided. The apparatus includes a first section, a second section coupled to the first section and movable between a folded state and an unfolded state including a plurality of partially folded states, a flexible display coupled to the first and second sections, a first sensor, and at least one processor to, while the mobile terminal apparatus is partially folded, identify one of the partially folded states of the mobile terminal apparatus, and control the display to display information corresponding to a compass direction based on magnetic related information obtained by the first sensor and according to the identified partially folded states. The electronic device can prevent distortion of the first sensor caused by the display by calibrating the geomagnetic value of the sensor based on an angle between a first surface of a first section and a third surface of the second section.

An electronic device includes a rotating body coupled to a bezel part to be rotatable and including a plurality of magnets, a pair of Hall sensors configured to sense a magnetic field caused by the plurality of magnets, a magnetic sensor disposed in an internal space, and a processor configured to calibrate, based on first magnetic field data, second magnetic field data based on a calculated offset value.

A self-rotating display device includes and outer light transmissive container (402) containing a light transmissive fluid (406) and an body (404) containing an electric motor (421) for rotating the body with respect to the outer container. The body also carries an amount of the fluid (430a) contacting the fluid in the outer container through a pressure equalizing gap (431) in the body which forms a fluid pathway between the inner cavity of the body and the inner chamber of the outer container. The fluid pathway forms self-regulating pressure relief structure which accommodates slight pressure variations in the fluid due to climactic conditions for example. A specialized reduced footprint fluid-immersible electric motor having separate field and compass magnets, which do not rotate relative to each other, helps eliminate magnetic cogging. The device can be manufactured according to a method which eliminates the necessity of a fill hole in the body.

A self-rotating display device includes and outer light transmissive container (402) containing a light transmissive fluid (406) and an body (404) containing an electric motor (421) for rotating the body with respect to the outer container. The body also carries an amount of the fluid (430a) contacting the fluid in the outer container through a pressure equalizing gap (431) in the body which forms a fluid pathway between the inner cavity of the body and the inner chamber of the outer container. The fluid pathway forms self-regulating pressure relief structure which accommodates slight pressure variations in the fluid due to climactic conditions for example. A specialized reduced footprint fluid-immersible electric motor having separate field and compass magnets, which do not rotate relative to each other, helps eliminate magnetic cogging. The device can be manufactured according to a method which eliminates the necessity of a fill hole in the body.

A method for correcting data sensed by a sensor includes: acquiring the data sensed by the sensor; establishing a surface equation based on an acquired data to performing surface fitting; and correcting the data sensed by the sensor with the surface equation. The method further includes: evaluating the acquired data sensed by the sensor to update fitting parameters of the surface equation so as to obtain an updated surface equation; and correcting the data sensed by the sensor with the updated surface equation. Parameter data sensed by the sensor can be corrected in real time, which reduces the influence of environmental factors on the parameter data sensed by the sensor and improves the accuracy of the data sensed by the sensor.

A method for correcting data sensed by a sensor includes: acquiring the data sensed by the sensor; establishing a surface equation based on an acquired data to performing surface fitting; and correcting the data sensed by the sensor with the surface equation. The method further includes: evaluating the acquired data sensed by the sensor to update fitting parameters of the surface equation so as to obtain an updated surface equation; and correcting the data sensed by the sensor with the updated surface equation. Parameter data sensed by the sensor can be corrected in real time, which reduces the influence of environmental factors on the parameter data sensed by the sensor and improves the accuracy of the data sensed by the sensor.

An electronic timepiece includes a detection axis calibration unit configured to execute first calibration processing of calibrating an axial direction and second calibration processing of calibrating a direction along a third detection axis, the second calibrating processing being executed after first calibration processing, a mode setting unit configured to set a first measurement mode when second calibration processing is not completed after completion of the first calibration processing, and set a second measurement mode when the second calibration processing is completed, a first azimuth calculation unit configured to calculate an azimuth, based on detected values of a three-axis magnetic sensor in two axial directions, when the first measurement mode is set, and a second azimuth calculation unit configured to calculate an azimuth, based on detected values of the three-axis magnetic sensor in three axial directions and a detected value of a inclination sensor, when the second measurement mode is set.

A navigation system for aiding a human navigating, the navigation system includes a belt having a belt length and opposite belt ends, and includes an elongated compartment; a belt coupling arranged to the belt for coupling the belt ends; a compass sensor arranged to the belt and for sensing the compass direction based on the earth's magnetic field; a tactile unit arranged for tactile communicating a direction to the human; additional tactile actuators arranged to the belt and for communicating a direction to the human. The additional tactile actuators are distributed over the length of the belt. An elongated mesh is provided for arranging the elongated mesh inside the elongated compartment, the additional tactile actuators being arranged to the mesh. A processing unit is configured for controlling the navigation system.