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.

A lawn mowing robot for performing self-driving is provided. The lawn mowing robot includes a body forming an appearance of the lawn mowing robot, a driving wheel configured to move the body, a sensor configured to sense information associated with a posture of the lawn mowing robot, and a controller configured to perform a calibration of the sensor to control the driving wheel to move the body in a predetermined pattern in an operating area of the lawn mowing robot, for setting a parameter associated with the sensor.

An approach is provided for generating trace data corresponding to one or more mobile devices detected within a premises, where the trace data specifies movement of the mobile device(s) within the premises. A map customizing platform utilizes the user traces to determine accessibility information about areas within the premises using connecting elements of the premises.

Systems and methods are provided that comprise calibration techniques and associated systems that identify the two-dimensional position, or other alignment or positioning, of sample wells or other calibration objects located in a sample well plate, or other surface or area of interest. In some embodiments, calibration of the plate and/or positioning and/or alignment with respect to detection optics can be performed in multiple stages for two or more dimensions.

A method for filtering the signals arising from a sensor assembly (EC) comprising at least one measurement sensor for measuring a vector physical field which is substantially constant over time and in space in a reference frame, said sensor assembly (EC) being tied in motion to a moving frame, moving in the reference frame, the method comprising the steps consisting in: applying a first transformation (T1) to the measurements of a measurement sensor of the sensor assembly (EC) which are provided in the moving frame, to a pseudo reference frame, with the aid of a first change-of-frame operator (R(t)) by rotation between the moving frame and the pseudo reference frame; and applying a filtering (FILT) to the measurements thus transformed in the pseudo reference frame; and applying a second transformation (T2), the inverse of said first transformation, to the measurements filtered by said filtering (FILT), from the reference frame to the moving frame, with the aid of a second change-of-frame operator (R.sup.−1(t)) by rotation between the pseudo reference frame and the moving frame, the inverse of said first operator (R(t)).

Method and device for precision adjustment of the beam direction of the light source of a device for aligning two objects relative to one another, the beam direction being moved by a motor via input elements of the computer of the alignment device.

An electronic device may have electrical components mounted in alignment with an electronic device housing. A compass in the electronic device housing may potentially be misaligned with respect to the electrical components and the electronic device housing. Reference devices having compasses may be used to gather compass data while one or more electrical components in the reference devices are controlled to generate magnetic fields that are detected by the compasses. An electronic device may be calibrated in a factory or in the field using calibration data produced by comparing compass readings gathered from the compass in the device while controlling electrical components in the device to compass data from the reference devices. Calibration data may be applied to compass readings in real time to correct for misalignment between the compass and the electronic device housing.

An electronic device may have electrical components mounted in alignment with an electronic device housing. A compass in the electronic device housing may potentially be misaligned with respect to the electrical components and the electronic device housing. Reference devices having compasses may be used to gather compass data while one or more electrical components in the reference devices are controlled to generate magnetic fields that are detected by the compasses. An electronic device may be calibrated in a factory or in the field using calibration data produced by comparing compass readings gathered from the compass in the device while controlling electrical components in the device to compass data from the reference devices. Calibration data may be applied to compass readings in real time to correct for misalignment between the compass and the electronic device housing.

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.

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.