For triaxial magnetic detection data sequentially acquired as data points in a triaxial coordinate system, an offset calculation unit 30 calculates virtual data points P1′-P6′ by evenly parallel-translating each of data points P1-P7 so that a reference data point P7, for example, arbitrarily chosen from the data points P1-P7 coincides with an origin point O. A virtual offset point C′ for which the sum of the distances between the virtual data points P1′-P6′ and a curved surface H1 passing through the origin point O is minimized is then calculated. An offset value C for the magnetic detection data is then calculated by parallel-translating the virtual offset point C′ so as to restore the parallel-translated portion.

For triaxial magnetic detection data sequentially acquired as data points in a triaxial coordinate system, an offset calculation unit 30 calculates virtual data points P1′-P6′ by evenly parallel-translating each of data points P1-P7 so that a reference data point P7, for example, arbitrarily chosen from the data points P1-P7 coincides with an origin point O. A virtual offset point C′ for which the sum of the distances between the virtual data points P1′-P6′ and a curved surface H1 passing through the origin point O is minimized is then calculated. An offset value C for the magnetic detection data is then calculated by parallel-translating the virtual offset point C′ so as to restore the parallel-translated portion.

A magnetometer that finds a magnitude of an ambient magnetic field, comprising: a) a diamond cubic structure crystal, with an ensemble of paramagnetic defects oriented along each of the crystal's four tetrahedral axes; b) a microwave source that produces a microwave field at the crystal, of controllable frequency over a range that includes microwave resonance frequencies of paramagnetic defects oriented along all four axes; c) a light source that illuminates the paramagnetic defects with light that causes fluorescent emission from the paramagnetic defects; d) a light detector that measures the fluorescent emission; and e) a controller configured to: 1) measure the fluorescent emission at different microwave frequencies within the range, to obtain a spectrum of the paramagnetic defect ensemble; 2) calculate a variance property of the spectrum; and 3) calculate the magnitude of the ambient magnetic field from the variance property.

A magnetometer that finds a magnitude of an ambient magnetic field, comprising: a) a diamond cubic structure crystal, with an ensemble of paramagnetic defects oriented along each of the crystal's four tetrahedral axes; b) a microwave source that produces a microwave field at the crystal, of controllable frequency over a range that includes microwave resonance frequencies of paramagnetic defects oriented along all four axes; c) a light source that illuminates the paramagnetic defects with light that causes fluorescent emission from the paramagnetic defects; d) a light detector that measures the fluorescent emission; and e) a controller configured to: 1) measure the fluorescent emission at different microwave frequencies within the range, to obtain a spectrum of the paramagnetic defect ensemble; 2) calculate a variance property of the spectrum; and 3) calculate the magnitude of the ambient magnetic field from the variance property.

Provided is an information processing apparatus including: a calculation unit that calculates a terminal coordinate system magnetic vector on the basis of a spatial coordinate system magnetic vector and a posture of a communication terminal; and a notification unit that notifies the communication terminal of the terminal coordinate system magnetic vector by non-contact communication.

There is disclosed a meteorological observation device for observing weather in an Atmospheric Boundary Layer or a Planetary Boundary Layer, comprising: a basic observation unit and one or more additional observation units which are connected directly or indirectly to the basic observation unit; a storage box whose inner space is compartmentalized to form a plurality of grids, wherein the grids include 1-st type cells, each of which holds the basic observation unit and each of the one or more additional observation units and 2-nd type cells, each of which forms 1-st sub space for holding a basic wire and 2-nd sub space for holding each of additional wires, wherein a size of each of the 2-nd type cells is determined as a size of each of the 1-st type cells.

A high precision magnetic compass based on a Hall probe. The probe is oriented at an angle of 90 degrees to the rotation axis of the device. An oscillating component of the signal from the probe, synchronized with the device rotation, is transferred to the non-rotation frame and is used to align the axis of rotation to be parallel to the magnetic field. The device does not require prior calibration. It is insensitive to drift of the probe parameters and can provide an angle with precision equal to or better than a 0.05 degree.

A high precision magnetic compass based on a Hall probe. The probe is oriented at an angle of 90 degrees to the rotation axis of the device. An oscillating component of the signal from the probe, synchronized with the device rotation, is transferred to the non-rotation frame and is used to align the axis of rotation to be parallel to the magnetic field. The device does not require prior calibration. It is insensitive to drift of the probe parameters and can provide an angle with precision equal to or better than a 0.05 degree.

This electronic compass has a magnetic sensor for detecting two predetermined axis components out of the three geomagnetic axis components in a location and generating biaxial magnetic detection data corresponding to the magnitudes of the components, an acceleration sensor for detecting three axis components of the acceleration thereof and generating triaxial acceleration detection data corresponding to the three axis components, and an azimuth angle detection unit for calculating assumed magnetic detection data corresponding to the one remaining undetected axis component of the three geomagnetic axis components from the biaxial magnetic detection data, the triaxial acceleration detection data, and the magnitude and the magnetic dip of the geomagnetic field and detecting an azimuth angle by determining the component of the geomagnetic field parallel to the surface of the earth using the assumed magnetic detection data.

This electronic compass has a magnetic sensor for detecting two predetermined axis components out of the three geomagnetic axis components in a location and generating biaxial magnetic detection data corresponding to the magnitudes of the components, an acceleration sensor for detecting three axis components of the acceleration thereof and generating triaxial acceleration detection data corresponding to the three axis components, and an azimuth angle detection unit for calculating assumed magnetic detection data corresponding to the one remaining undetected axis component of the three geomagnetic axis components from the biaxial magnetic detection data, the triaxial acceleration detection data, and the magnitude and the magnetic dip of the geomagnetic field and detecting an azimuth angle by determining the component of the geomagnetic field parallel to the surface of the earth using the assumed magnetic detection data.