A method and device for magnetometer calibration evaluation
A technology of magnetometer and magnetometer data, applied in the field of magnetometer, can solve the problems of poor experience effect, no feedback of good or bad calibration, etc., to achieve the effect of good user experience
Active Publication Date: 2020-09-11
GEER TECH CO LTD
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Problems solved by technology
The traditional "8" figure calibration is like a black box for the user. During the process of drawing the figure 8 dancing magnetometer in the air, the customer does not know what the calibration result is at this time, and there is no feedback on whether the calibration is good or bad. The experience is poor.
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[0056] The technical concept of the present invention is: on the basis of the existing magnetometer initial calibration technology, the inventor of the present invention has found through a large number of experiments that the method of fitting the major and minor axis errors of the ellipse can be used to provide a magnetometer evaluation standard, with It overcomes the problems in the prior art that the user cannot know whether the calibration result of the magnetometer is good or not, and the user experience effect is poor.
[0057] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0058] When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described ...
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The invention discloses a method and device for evaluating magnetometer calibration. The method comprises a step of performing multiple calibration on a magnetometer according to magnetometer data collected in real time by the magnetometer, obtaining a fitting ellipse for each time of calibration; a step of calculating long and short axis error values for two fitting ellipses obtained in two adjacent calibration in order, and a step of outputting a calibration evaluation result of the magnetometer according to the long and short axis error values calculated in multiple times, and determining whether the magnetometer is continuously calibrated according to the calibration evaluation result. The problem that a user cannot know the magnetometer calibration result in the prior art is overcome,the user selects whether to continue the calibration according to the evaluation result and the willingness of the user, the method and the device are user-friendly, and a user experience is good.
Description
technical field [0001] The invention relates to the field of magnetometers, in particular to a method and device for calibrating and evaluating magnetometers. Background technique [0002] The magnetometer is the most susceptible to interference among the nine-axis sensors, and the calibration of the magnetometer is an important factor in calculating the heading angle, so the calibration of the magnetometer is particularly important. In the initial calibration of the magnetometer, the fitting ellipse is obtained through a series of algorithms. After the ellipse fitting is completed, it will be processed by rotation, translation, scaling, etc., and the inclined ellipse whose center is not at the origin of the coordinates is transformed into a center at the origin of the coordinates through geometric transformation. , so as to achieve geomagnetic calibration that removes soft and hard magnetic interference. The traditional "8" calibration is like a black box for the user. Dur...
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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 陈维亮
Owner GEER TECH CO LTD