Automatic calibration method for use in electronic compass

An electronic compass and azimuth technology, applied to compass, measuring device, surveying and navigation, etc., can solve the problem of not being able to update calibration data
CN1624425AInactive Publication Date: 2005-06-08SAMSUNG ELECTRO MECHANICS CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SAMSUNG ELECTRO MECHANICS CO LTD
Publication Date
2005-06-08
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

An automatic calibration method used in an electronic compass. Using this automatic calibration method, the electronic compass automatically calculates and corrects the offset and scale values ​​of the geomagnetic signal by detecting one rotation of the geomagnetic axis during a predetermined period. The electronic compass calculates the azimuth when it receives the geomagnetic data from the geomagnetic sensor and uses the received geomagnetic data to find the maximum and minimum values ​​of the sensor signals of the individual axes of the geomagnetic sensor so that it can correct or calibrate the deviation of the azimuth . When the time taken for calibration is equal to or shorter than the maximum calibration valid time, the electronic compass determines whether the current state of the detected input signal indicates a predetermined steady state flow. If the current state represents a steady state flow, while a signal representing one revolution of the geomagnetic sensor is received, and the calibration takes longer than the predetermined minimum calibration valid time, the electronic compass uses the maximum and minimum values ​​to calculate the offset and scale values ​​and store the calculated offset and scale values.
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Description

technical field

[0001] The present invention relates to an automatic calibration method for use in an electronic compass, and more particularly to an automatic calculation and correction of an offset of a geomagnetic signal for use in an electronic compass by detecting one rotation of the geomagnetic axis during a predetermined period using a timer and scale values, performing automatic calibration capable of calculating the offset and scale values ​​of the geomagnetic signal without receiving additional input data from the user, and an automatic calibration method that quickly responds to environmental changes. Background technique

[0002] Recently, small and low-priced geomagnetic sensor modules and electronic compasses have been developed. With the increasing development of MEMS (Micro Electro Mechanical System) technology, chip-sized geomagnetic sensor modules have been newly developed and used for various applications. There is a need for a geomagnetic sensor that con...

Claims

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