Abstract: A method for controlling at least one component of a motor vehicle provided with energy storage means. The method comprises the steps of determination of an energy reserve value of the vehicle; evaluation of at least one critical energy autonomy threshold; and comparison of the energy reserve value with at least one critical autonomy threshold so as to deduce therefrom a setpoint signal for controlling the component.

Abstract: A method of indicating an interference magnetic field at an electronic device includes: displaying a first arrow indicating a direction of magnetic north on a display of the electronic device, the direction of the first arrow corrected to remove interference caused by an interference magnetic field; and displaying a second arrow indicating a direction of a source of the interference magnetic field on a display of the electronic device.

Abstract: A compass output in a first portable electronic device is monitored as the first device and a second electronic device come closer to each other. It is determined, by a process running in the first device, whether a magnetic field signature that is based on the monitored compass output is associated with a previously defined type of electronic device with which a network device discovery process is to be conducted. Other embodiments are also described and claimed.

Abstract: An audio processing system processes an audio signal that may come from one or more microphones. The audio processing system may use information from one or more non-acoustic sensors to improve a variety of system characteristics, including responsiveness and quality. Especially those audio processing systems that use spatial information, for example to separate multiple audio sources, are undesirably susceptible to changes in the relative position of any audio sources, the audio processing system itself, or any combination thereof. Using the non-acoustic sensor information may decrease this susceptibility advantageously in an audio processing system.

Abstract: In an apparatus for controlling an autonomous operating vehicle having a prime mover and operating machine, it is configured to have a geomagnetic sensor responsive to magnets embedded in the area, detect angular velocity generated about z-axis in center of gravity of the vehicle, detect a wheel speed of the driven wheel, store map information including magnet embedded positions, detect a primary reference direction, detect a vehicle position relative to the magnet, and detect a vehicle position in the area, calculate a traveling direction and traveled distance of the vehicle, and control the operation performed through the operating machine in the area in accordance with a preset operation program based on the detected direction, the detected position of the vehicle in the area, the calculated traveling direction and the calculated traveled distance.

Abstract: A compass system configured to compensate for electromagnetic interference in a vehicle is provided that includes an electronic device that is sensitive to electromagnetic interference (EMI), wherein the electronic device is positioned in a vehicle such that the electronic device receives EMI from another accessory in the vehicle, and wherein the electronic device is configured to compensate for the EMI, such that the EMI field caused by the accessory can be detected and added to existing calibration point while the accessory is powered on.

Abstract: A mobile device configured to be used in a wireless communication network includes: an image capture device; at least one sensor configured to measure a first orientation of the mobile device; and a processor communicatively coupled to the image capture device and the at least one sensor and configured to: identify an object in an image captured by the image capture device; use a position of the mobile device to determine an actual location of the object relative to the mobile device; and use the actual location of the object relative to the mobile device and the image to determine a correction for the sensor.

Abstract: A bias value associated with a sensor, e.g., a time-varying, non-zero value which is output from a sensor when it is motionless, is estimated using at least two, different bias estimating techniques. A resultant combined or selected bias estimate may then be used to compensate the biased output of the sensor in, e.g., a 3D pointing device.

Abstract: A method and system for calibrating a digital speedometer display to match an analog speedometer indicated value. The method generally includes calibrating each analog speedometer unit such that the exact deviation or “offset” from the center point of the analog speedometer is known. This measured deviation is then used to adjust the value input to the digital display thereby making the digital display value match the indicated value of the analog speedometer.

Abstract: Described are methods and systems for controlling sensor use on an electronic device, the electronic device having a first sensor defining at least one first sensor axis, the method comprising: detecting a first sensor reading; determining an orientation of the electronic device; and, disabling the detection of the first sensor reading in respect an identified first sensor axis when the first sensor reading in respect of the identified first sensor axis is substantially not expected to change for at least a predetermined amount of time.

Abstract: 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 sensor; evaluating the first sensor readings and the second sensor readings to determine whether the electronic device is stationary; locking the orientation values when the electronic device is stationary; collecting at least one of further first sensor readings and further second sensor readings while the orientation values are locked; determining whether the orientation of the electronic device is changing by more than a threshold amount based on one or more of the further first sensor readings and the further second sensor readings; and unlocking the orientation values for updating based on the further sensor readings when the orientation of the electronic device is changing by more than the threshold amount.

Abstract: A multi-dimensional sensor, a magnetometer or accelerometer, is calibrated based on the raw data provided by the sensor. Raw data is collected and may be used to generate ellipse or ellipsoid parameters, for a two-dimensional or three-dimensional sensor, respectively. An offset calibration factor is calculated based on the raw data, e.g., the determined ellipse or ellipsoid parameters. A sensitivity calibration factor is then calculated based on the offset calibration factor and the raw data. A non-orthogonality calibration factor can then be calculated based on the calculated offset and sensitivity calibration factors. Using the offset, sensitivity and non-orthogonality calibration factors, the raw data can be corrected to produce calibrated data.

Abstract: Described are methods and systems for estimating a baseline of a proximity sensor on an electronic device comprising: collecting proximity sensor data at the electronic device using the proximity sensor; collecting second data using a second source at the electronic device; obtaining a sample of the proximity sensor data at the electronic device when it is determined that no object is proximal to a first face of the electronic device based on the proximity sensor data and based on the second data; and approximating the baseline of the proximity sensor using the obtained sample.

Abstract: Sensor measurements are used to detect when a device incorporating the sensor is stationary. While the device is stationary, sensor measurements at a current device temperature are used to estimate model parameters. The model parameters can be used in a state estimator to provide an estimated attitude that can be provided to other applications. In some implementations, the estimated attitude can be used to mitigate interference in other sensor measurements.

Abstract: Methods and apparatus are provided for determining the attitude and heading angle of a crane jib. Crane jib angular velocity, crane jib roll angle, crane jib pitch angle, crane jib specific force, and magnetic field in the local operating environment of the crane jib are all sensed and supplied to a processor. All of these measurements are processed, in a processor, to estimate the attitude and heading angle of the crane jib.

Abstract: 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 provide fine-tuned functions or interpolated data which may be used for real-time sensor correction calculation or to populate a look-up table of corrected values.

Abstract: Methods for calibrating a body-worn magnetic sensor by spinning the magnetic sensor 360 degrees to capture magnetic data; if the spin failed to produce a circle contained in an x-y plane fit a sphere to the captured data; determining offsets based on the center of the sphere; and removing the offsets that are in the z-direction. Computing a magnetic heading reliability of a magnetic sensor by determining an orientation of the sensor at one location; transforming the orientation between two reference frames; measuring a first vector associated with the magnetic field of Earth at the location; processing the first vector to generate a virtual vector when a second location is detected; measuring a second vector associated with the magnetic field of Earth at the second location; and calculating the magnetic heading reliability at the second location based on a comparison of the virtual vector and the second vector.

Abstract: One embodiment of the invention includes a nuclear magnetic resonance (NMR) gyroscope system. The system includes a gyro cell that is sealed to enclose an alkali metal vapor, a first gyromagnetic isotope, and a second gyromagnetic isotope. A magnetic field generator configured to generate a magnetic field that is provided through the gyro cell to cause the first and the second gyromagnetic isotopes to precess. A magnetic field error controller configured to measure an error associated with a magnitude of the magnetic field and to generate an error signal that is fed back to the magnetic field generator to maintain the magnetic field at a desired magnitude. The system further includes a mechanization processor configured to calculate a rotation angle about a sensitive axis of the NMR gyroscope system based on a measured precession angle of at least one of the first and second gyromagnetic isotopes and the error signal.

Abstract: In a method for determining an offset of measured values of a multiaxial directional sensor using a superposed signal, a large number of multiaxial measured values are recorded first. Measured values, which are recorded in different orientations of the directional sensor, form a geometric figure in a coordinate system resulting from the measuring axes of the sensor, the ideal form of the geometric figure being known and the ideal center point of which being located at the origin of the measuring axes. In the case of a biaxial sensor, the geometric figure is a circle; in the case of a triaxial sensor, it is a sphere around the origin. The superposition caused by the interference is reflected in that the center point of the geometric figure is shifted in relation to the origin of the measuring axes. The offset is measured by determining this shift.

Abstract: An azimuth calculation program is a computer-executable program that performs an azimuth calculation using output of a magnetic sensor. The azimuth calculation program includes a first step of generating one triangle in three-dimensional space using three output values of a magnetic sensor unit, a second step of determining a circumcircle of the triangle, and a third step of performing an azimuth calculation using center coordinates of the circumcircle and output values of the magnetic sensor.

Abstract: A system and method of determining a magnetic field and magnetic compass calibration is disclosed. One embodiment is a method of determining a magnetic field vector, the method comprising storing, for each of a plurality of sensor orientations, one or more calibration components, determining, for a sensor orientation not included in the plurality of sensor orientations, a magnetic field vector and a gravity vector, iteratively estimating one or more calibration coefficients based on the stored components, the determined magnetic field vector, and the determined gravity vector, wherein the calibration coefficients are updated during each of a plurality of iterations, and determining a sensor-orientation-independent magnetic field vector based on at least one of the calibration coefficients.

Abstract: An apparatus of a wireless communication system includes: a transceiver configured to receive and transmit information wirelessly; and a processor communicatively coupled to the transceiver and configured to access an image captured by an access terminal of the wireless communication system, a position of the access terminal, and multiple keypoints and a geographical location of each respective keypoint, each geographical location being a location near the position of the access terminal; and determine a magnetic deviation corresponding to the position of the access terminal by calculating a compass bearing and a true bearing to a feature within the image using the position of the access terminal and the geographical location of a keypoint, from the multiple keypoints, determined as corresponding to the feature.

Abstract: A method is provided for removing gimbal periodic reorientation (indexing) readout errors in a navigation system having multiple IMUs mounted to a platform. Each IMU has multiple gyroscopes providing attitude outputs. Attitude readout errors bias due to periodic gimbal motions is determined in each IMU along each gyroscope attitude axis. Attitude outputs of the gyroscopes are time-aligned, as necessary. Onset times of indexing of each gyroscope is determined. A difference is formed between gyroscope attitude outputs. Steps in this difference of attitude outputs are assigned to the respective gyroscope causing the step in attitude. Cumulative sums of the steps associated with the respective gyroscopes are formed. The mean and linear trend in the respective cumulative sums are removed from the respective cumulative sums to form the final error correction, corresponding to the time interval associated with the steps.

Abstract: A dynamically self-adjusting magnetometer is disclosed. In one embodiment, a first sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A second sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A summing module sums the absolute value of the electronic signal from the first sample module and the electronic signal from the second sample module. A delta comparator module receives the electronic signals from each of the first sample module, the second sample module and the summing module and compares each of the electronic signals with a previously received set of electronic signals to establish a change, wherein an output is generated if the change is greater than or equal to a threshold.

Abstract: In an electronic device and a method of correcting time-domain reflectometers, two channels of a time-domain reflectometer are connected to a corrector using cables, and the two channels are enabled to transmit pulses. Parameters Step Deskew and Channel Deskew of the two channels are zeroed. Resistance values of the two channels are measured simultaneously, and the value of the parameter Step Deskew of one of the two channels is adjusted according to the Resistance values of the two channels. Times of achieving the same resistance value of the two channels are measured after the cables and the connector have been disconnected, and the value of the parameter Channel Deskew of one of the two channels is adjusted according to the times of achieving the same resistance value. The adjusted values of the parameters Step Deskew and Channel Deskew are displayed through a display unit.

Abstract: Disclosed is a positioning apparatus including: an autonomous navigation sensor which is held by a pedestrian and which outputs periodic oscillation and direction information; a step length data storage section which stores step length data; a movement distance calculating section which calculates movement distance; a traveling direction calculating section which calculates a traveling direction; and a movement direction calculating section which calculates a movement direction for each step, wherein the movement distance calculating section includes a taken step angle calculating section which calculates a taken step angle from the movement direction for each step with respect to the traveling direction; and the movement distance calculating section corrects a value of the step length data so that the step length is larger as the taken step angle becomes larger to calculate a movement distance for each step.

Abstract: A method that compensates gyroscopes comprises rotating a sensor platform with three gyroscopes, three accelerometers and three magnetometers thereon; determining a first rotation vector Og based upon the rotation sensed by at least one of the three gyroscopes; determining a second rotation vector Om vector based upon the rotation sensed by the three accelerometers and the three magnetometers; and determining a compensation gain and a compensation bias for the at least one gyroscope based upon the first rotation vector and the second rotation vector.

Abstract: Methods and electronic devices for determining orientation are described. In one aspect, the present disclosure provides a processor-implemented method of determining a corrected orientation of a gyroscope on an electronic device. The method includes: obtaining a gyroscope reading; determining a first orientation estimate based on the gyroscope reading and a past corrected orientation; determining whether the gyroscope was saturated when the gyroscope reading was obtained; adjusting a saturation correction learning rate for the gyroscope based on the result of the determination of whether the gyroscope was saturated; and determining a corrected orientation based on the first orientation estimate, a second orientation estimate and the saturation correction learning rate.

Abstract: Methods and apparatuses for calibrating attitude-independent parameters of a 3-D magnetometer are provided. A calibration method includes storing and updating data related to a N×9 matrix T and a N×1 matrix U extended for each measurement with an additional row and an additional element, respectively, the additional row and the additional element being calculated based on values measured by the 3-D magnetometer for the respective measurement. The method further includes calculating analytically (1) a symmetric non-orthogonal 3×3 matrix D representing scaling and skew of the 3-D magnetometer measured values and (2) a vector b representing bias of the 3-D magnetometer measured values, using the stored data and a singular value decomposition (SVD) method.

Abstract: A method for tracking dynamic near fields and correcting a magnetic field measured together with an angular position having an unknown yaw offset relative to a gravitational reference system includes calculating a magnetic field difference between a magnetic field based on the measured magnetic field and the angular position, and a previous total magnetic field, estimating current near fields to be a sum of previous near fields and a portion of the calculated magnetic field difference, computing a magnitude difference, and an angular difference between the measured magnetic field corrected using the estimated current near fields and a fixed vector, comparing the magnitude difference and the angle difference with noise, and if the current measured magnetic field is consistent with the previously tracked magnetic near fields, updating the angular position and correcting the measured magnetic field for the current near field effects using the updated angular position.

Abstract: In a gyroscopic system, a vibrating gyroscope is controlled in gyrometer mode in a control loop. The control loop corresponds to at least one current control for an operating parameter. In the control loop, a modified control to be applied to the gyrometer for said operating parameter is obtained (11) by introducing a sinusoidal interference into the current control. Then, the modified control is applied (12) to the gyrometer as the current control. A resulting measurement value (13) is determined. A sinusoidal interference (14) is calculated as a function of said measurement value. Lastly, on the basis of the measurement value, it is decided (15) whether to repeat the previous steps on the basis of the sinusoidal interference last determined.

Abstract: The magnitude of a sensed, raw magnetic field in a portable device is monitored over a given time interval. The monitored magnitude is compared with predetermined criteria. Based on the comparison, recalibration of a compass function is signed. Other embodiments are also described and claimed.

Abstract: A method for determining long-term offset drifts of acceleration sensors in a motor vehicle is provided. In one step, the longitudinal vehicle speed is determined in the vehicle's center of gravity. In another step, the share of the driving dynamics in the longitudinal reference acceleration formula and in the transversal reference acceleration formula is calculated from the longitudinal vehicle speed and the yaw rate. In yet another step, the share of the driving dynamics in the reference acceleration on the vehicle level formula is calculated by converting the driving dynamic reference accelerations formula calculated for the center of gravity to the position formula and the orientation of the sensor formula. In a further step, the long-term offset drift of the sensor is determined from the measured values of the sensor and the share of the measured value in the driving dynamics by means of a situation-dependent averaging process.

Abstract: A method for making dynamic gravity toolface measurements while rotating a downhole measurement tool in a borehole is disclosed. The method includes processing magnetic field measurements and accelerometer measurements to compute a toolface offset and further processing the toolface offset in combination with a magnetic toolface to obtain the dynamic gravity toolface. Methods for correcting dynamic and static navigational sensor measurements to remove sensor biases, for example, are also disclosed.

Abstract: A method of determining the heading of an excavator at a worksite uses a magnetic field sensor, mounted on the excavator, inclinometers that provide an indication of the pitch and roll of the excavator, a gyroscopic sensor that senses the rotational rate of the excavator about the Z axis of the magnetic field sensor, and a processor circuit, having an associated memory. A calibration table of data is created and stored using the gyroscopic sensor as the excavator is rotated at a uniform velocity. The sensed indications of the magnetic field from the coordinate reference frame of the sensor are transformed to the local level plane coordinate reference frame using the outputs from the inclinometers.

Abstract: 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).

Abstract: In a self-calibration method of an angle detector, an angle interval between first and second scale reader heads are set, so that a single rotation is not equally divided into an integer number of potions by a value of the angle interval and that a plurality of rotations N are equally divided into M equal portions by the value of the angle interval. Readings by the scale reader heads during N rotations of the divided circle are obtained at a pre-set data sampling interval. From differences in readings by these scale reader heads, data of the sequential two-point method relating to an angle scale error of the divided circle are obtained at the data sampling interval. The scale error of the divided circle at the data sampling interval is calculated by synthesizing the data using the fact that an average of the data for the rotations N reaches approximately zero.

Abstract: Responsive to a recalibration trigger event, magnetometer data output by a magnetometer can be compared to historical magnetometer data previously output by the magnetometer. If a match is determined, a confidence of the match can be determined using theoretically constant data related to Earth's magnetic field. The constant data can be calculated from the historical magnetometer data. If the confidence of the match exceeds a confidence threshold level, historical calibration data can be used to calibrate the magnetometer. If the confidence of the match does not exceed the confidence threshold level, a calibration procedure can be performed to generate new calibration data, and the new calibration data can be used to calibrate the magnetometer.

Abstract: A postural state attitude monitoring, caution, and warning system includes a multiple axis accelerometer carried by a node for generating output signals that are a function of positional orientation of the node along a path of attitude displacement of the node extending from a reference position of the node to a caution position of the node, and from the caution position of the node to a warning position of the node, and a signal device operatively coupled to the multiple axis accelerometer for issuing a caution signal in response to a caution positional state of the node at the caution position of the node and distally therebeyond to inside of the warning position of the node, and for issuing a warning signal different from the caution signal in response to a warning positional state of the node at the warning position of the node and distally therebeyond.

Abstract: An information processing apparatus includes an analysis unit, a gathering place determination unit, and a correction unit. The analysis unit analyzes an action history including at least a position of a subject, in accordance with action information obtained by detecting an action of the subject. The gathering place determination unit determines a position of a gathering place where plural subjects including the subject are together, in accordance with position information indicating the position of the subject which is included in the action information. The correction unit corrects position information about the subject, in accordance with the position of the gathering place determined by the gathering place determination unit.

Abstract: Methods, systems, and computer-readable media are described herein for using a modified Kalman filter to generate attitude error corrections. Attitude measurements are received from primary and secondary attitude sensors of a satellite or other spacecraft. Attitude error correction values for the attitude measurements from the primary attitude sensors are calculated based on the attitude measurements from the secondary attitude sensors using expanded equations derived for a subset of a plurality of block sub-matrices partitioned from the matrices of a Kalman filter, with the remaining of the plurality of block sub-matrices being pre-calculated and programmed into a flight computer of the spacecraft. The propagation of covariance is accomplished via a single step execution of the method irrespective of the secondary attitude sensor measurement period.

Abstract: Electronic devices may be provided with compasses for detecting the Earth's magnetic field. Electronic devices may be provided with other electronic components. A compass may include a magnetic sensor and control circuitry configured to apply offsets or other compass calibration data to compass data to compensate for magnetic interference from the other electronic components. Other electronic components may include components such as cameras, auto-focus lens mechanisms, light sources, and displays. The control circuitry may be configured to apply compass calibration data that is specific to an electronic component and that is specific to an operational status of the component. The control circuitry may be configured to recognize a replacement electronic component and revert to an average compass calibration correction. The control circuitry may be configured to output interference-corrected compass data to applications running on the electronic device.

Abstract: A pointing and control device for a computer system, the device having a body that can be maneuvered by a user; and an inertial sensor fixed to the body for supplying first signals correlated to the orientation of the body with respect to a gravitational field acting on the inertial sensor. The device moreover includes a magnetometer fixed to the body for supplying second signals correlated to the orientation of the body with respect to the Earth's magnetic field acting on the magnetometer and processing modules for determining an orientation of the body in an absolute reference system, fixed with respect to the Earth's magnetic field and gravitational field on the basis of the first signals and second signals.

Abstract: In a magnetic data processing device, an input part sequentially receives magnetic data output from a magnetic sensor. A storage part stores a plurality of the magnetic data as a data set of statistical population. An index derivation part derives a distribution index of the data set of the statistical population. A reliability determination part determines whether or not reliability of the data set of the statistical population is acceptable based on the distribution index and a decision criterion. A decision criterion setting part increases strictness of the decision criterion when the reliability determination part determines that the reliability of the data set of the statistical population is acceptable, and decreases the strictness of the decision criterion when the reliability determination part determines that the reliability of the data set of the statistical population is unacceptable.

Abstract: A magnetic compass comprising a magnetometer for taking readings of a magnetic field and a processing unit that calibrates the magnetic compass is provided. The processing unit is configured to validate a predetermined number of magnetic field samples and calculate calibration coefficients from the validated magnetic field samples. Each validated magnetic field sample is at least a minimum separation angle apart from every other validated magnetic field sample.

Abstract: A method for detecting a rotation and a direction of a rotation of a rotor, on which at least one damping element is positioned, wherein two sensors are arranged. The sensors are damped depending on a position of the damping element. After a standardization has been performed, the measurements are taken by observing consecutive rotational angle positions and then standardization rules are applied to the measured decay times of the sensors. Then a vector, which is entered into a coordinate system, is formed from the values. The present vector angle is determined and compared to the value of a suitable prior vector angle. From the result of the comparison, it is determined whether the rotor has performed a rotation and whether the rotation was forward or backward. By repeating the measurements in the rhythm of the scanning frequency, the rotational motions of the rotor can be detected with high accuracy.

Abstract: A moving trajectory calibration method is applied to receive a moving trajectory signal generated by a writing device while moving on a written plane and includes the following steps of: generating a first axial signal, a second axial signal and a third axial signal according to the moving trajectory signal by a detecting-calibration unit of an orientation calculation module, wherein the written plane is composed of the first axis and the second axis, and the third axis is perpendicular to the written plane; calibrating the first axial signal according to the third axial signal by the detecting-calibration unit, so as to generate a first axial trajectory signal; and calibrating the second axial signal according to the third axial signal by the detecting-calibration unit, so as to generate a second axial trajectory signal. In addition, a moving trajectory generation method is also disclosed.

Abstract: Measurement data is collected from a magnetic sensor in a portable device, while the device is being carried by its end user and without requiring the end user to deliberately rotate or position the device while the output data is being collected. For example, the device may be held in the user's hand while walking or standing, or it may be fixed to the dashboard of an automobile or boat. Measurement data may also be collected from one or more positing, orientation or movement sensors. The collected measurement data from one or both of the magnetic sensor and the position, orientation or movement sensor is processed. In response, either a 2D compass calibration process or a 3D process is signaled to be performed. Other embodiments are also described and claimed.

Abstract: A calibrating method for a portable electronic device having azimuth device such as an electronic compass is disclosed. The calibrating method can be achieved by checking at least one sensor in the portable device incorporating the electronic compass configured in the portable device, so as to effectively detect and verify a temporary abnormal magnetic field caused by a stylus movement. When the electronic compass detects an abnormal magnetic field, the operation status of the sensor is checked for any change existence. If the operation status of the sensors changes, the abnormal magnetic field is verified as a temporary magnetic filed due to the movement of the stylus, in which case the electronic compass passes the calibration and goes on detecting the geomagnetic field according to its default setting value.

Abstract: In a magnetic data processing device, an input part sequentially inputs magnetic data outputted from a two-dimensional or three-dimensional magnetic sensor. The magnetic data is two-dimensional or three-dimensional vector data that is a linear combination of a set of fundamental vectors. The magnetic data processing device stores a plurality of the inputted magnetic data as a data set of statistical population in order to update an old offset of the magnetic data with a new offset. An offset derivation part derives the new offset based on the old offset and the data set of statistical population under a constraint condition that the new offset be obtained as the sum of the old offset and a correction vector.