A calibration method for a three-dimensional electronic compass

A technology of electronic compass and calibration method, which is applied in the direction of measuring devices, instruments, etc., can solve problems such as difficult to meet field operations, achieve the effect of eliminating soft and hard magnetic interference, good effect, and wide application prospects

Active Publication Date: 2021-08-31
FUZHOU UNIV
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Problems solved by technology

Difficult to meet the needs of field operations

Method used

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  • A calibration method for a three-dimensional electronic compass
  • A calibration method for a three-dimensional electronic compass
  • A calibration method for a three-dimensional electronic compass

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Embodiment Construction

[0061] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0062]The invention provides a method for calibrating a three-dimensional electronic compass. The electronic compass is moved in a figure-of-eight motion in space, and the data read by the three axes of the magnetic sensor are collected; then the collected data are fitted with an ellipsoid to obtain The spherical equation and the coordinates of the center of the sphere; then project the fitted ellipsoid equation onto the three coordinate axis planes respectively, and obtain the parameters of the ellipse on the three planes: α, b, and major axis rotation angle; finally, according to the obtained Parameter pairs for data calibration. The specific implementation steps of this method are as follows:

[0063] Step S1: Make the electronic compass move in figures of eight in space, so that the electronic compass collects data corresponding to e...

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Abstract

The invention relates to a method for calibrating a three-dimensional electronic compass. Move the electronic compass in a figure-of-eight motion in space to collect the data read by the three axes of the magnetic sensor; then fit the collected data to an ellipsoid to obtain the ellipsoid equation and the coordinates of the center of the sphere; then fit the obtained The ellipsoid equation is projected to the three coordinate axis planes respectively, and the parameters of the ellipse on the three planes are calculated respectively: α, b, and major axis rotation angle; finally, the newly obtained data is calibrated according to the obtained parameters. The method of the invention makes the calibration process of the electronic compass more flexible and more accurate, and meets the requirements of field sports.

Description

technical field [0001] The invention relates to a method for calibrating a three-dimensional electronic compass. Background technique [0002] In recent years, electronic compasses have been widely used in navigation, human body posture measurement and other scenarios. Since the GPS signal is very weak in places such as forests and dense buildings, an electronic compass is usually needed to assist in positioning. [0003] The working principle of the electronic compass is to measure the component strength of the geomagnetism in a certain direction through a magnetic sensor, determine the angle between the sensor and the geomagnetism, and then determine the heading. However, the earth's magnetic field is a weak magnetic field, and the hard magnetic interference and soft magnetic interference brought by the magnetic materials around the electronic compass will cause the measured value of the magnetic sensor to deviate from the true value. In addition, due to the process prob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 魏榕山曾濯渠杨培祥
Owner FUZHOU UNIV
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