Disclosed is an electronic device comprising: a gyro sensor; an acceleration sensor for outputting acceleration data about motion of the electronic device; a geomagnetic sensor for outputting geomagnetic data about a magnetic field around the electronic device; and a low-power processor electrically connected to the gyro sensor, the acceleration sensor and the geomagnetic sensor. The low-power processor: operates the acceleration sensor while the gyro sensor is deactivated to determine a motion pattern of the electronic device; drives the geomagnetic sensor to acquire geomagnetic data such that, if the motion of the electronic device corresponds to a predetermined first motion pattern, the geomagnetic data is acquired at a first sample rate, and, if the motion corresponds to a predetermined second motion pattern, the geomagnetic data is acquired at a second sample rate higher than the first sample rate; and calibrates the geomagnetic sensor on the basis of the geomagnetic data.

Visual codes are scanned to assist navigation. The visual code may be a Quick Response (QR) code that contains information useful to calibrating a variety of navigation-based sensors such as gyroscopes, e-compasses, and barometric pressure sensors. Embodiments describe methods for magnetometer calibration and computing sensor orientation relative to users' local frame of reference. The embodiments use an initial yaw estimate, accelerometer, and gyroscope measurements along with other readily available information (the earth's magnetic field intensity, inclination angle, and declination angle).

Visual codes are scanned to assist navigation. The visual code may be a Quick Response (QR) code that contains information useful to calibrating a variety of navigation-based sensors such as gyroscopes, e-compasses, and barometric pressure sensors. Embodiments describe methods for magnetometer calibration and computing sensor orientation relative to users' local frame of reference. The embodiments use an initial yaw estimate, accelerometer, and gyroscope measurements along with other readily available information (the earth's magnetic field intensity, inclination angle, and declination angle).

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 using a measurement from the sensor, estimate a sensor error of the sensor using the first estimated position and the second estimated position, and use the sensor error to determine a calibration value for adjusting one or more measurements from the sensor.

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 using a measurement from the sensor, estimate a sensor error of the sensor using the first estimated position and the second estimated position, and use the sensor error to determine a calibration value for adjusting one or more measurements from the sensor.

Systems and methods may provide for obtaining first sensor data associated with a gyroscope and obtaining second sensor data associated with a magnetometer. Additionally, the first sensor data, the second sensor data and an extended Kalman filter may be used to calibrate the magnetometer. In one example, a sampling rate of the magnetometer is increased before obtaining the second sensor data and the sampling rate of the magnetometer is decreased after calibration of the magnetometer.

Systems and methods may provide for obtaining first sensor data associated with a gyroscope and obtaining second sensor data associated with a magnetometer. Additionally, the first sensor data, the second sensor data and an extended Kalman filter may be used to calibrate the magnetometer. In one example, a sampling rate of the magnetometer is increased before obtaining the second sensor data and the sampling rate of the magnetometer is decreased after calibration of the magnetometer.

Disclosed is an optoelectronic measuring device having an electronic magnetic compass for determining an azimuthal alignment of the measuring device and a compensation unit, which is associated with the magnetic compass, for compensating for device-fixed interference fields, wherein the measuring device assumes at least two defined, repeatable operating states, has a different device-fixed interference field in each of the operating states, and the compensation unit carries out an initial compensation of the electronic magnetic compass in a first operating state of the measuring device, wherein the compensation unit has a detection unit for detecting a present operating state, a memory unit for storing a magnetic offset resulting from the different device-fixed interference fields between the first and a second operating state of the measuring device, and a computer unit for computing the azimuthal alignment of the measuring device depending on an ascertained operating state and based on the magnetic offset.

Examples of systems and methods for calibrating or operating a magnetic sensor for sensor temperature or operating conditions are provided. The magnetic sensor can comprise a dual magnetometer sensor that comprises a first, low-power-consumption magnetometer (e.g., a magneto-inductive magnetometer) and a second higher-power-consumption magnetometer (e.g., a magneto-resistive magnetometer). The second magnetometer can have a lower unit-to-unit variation in temperature calibration parameters and can be used to temperature-correct readings from the first magnetometer. The magnetic sensor can dynamically switch between usage of the first magnetometer and the second magnetometer in order to provide a dynamic sample rate that can depend on conditions within the sensor or external to the sensor.

A wireless positioning system is provided which includes a point information transmitter and a wireless positioning terminal carried by a user to communicate wirelessly with the point information transmitter. The point information transmitter is installed at a predetermined installation position and transmits point information including at least magnetic correction information to correct a geomagnetic bias at the installation position. The wireless positioning terminal includes an orientation detector to detect an orientation based on geomagnetism and a correction section to correct the orientation detected by the orientation detector based on the magnetic correction information included in the point information received from the point information transmitter.