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A self-calibrating electronic compass and its calibrating method

An electronic compass and correction method technology, applied in the field of inertial navigation, can solve the problem of low precision, achieve the effect of fast convergence speed and improve the accuracy of heading calculation

Active Publication Date: 2020-07-10
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still needs to rotate the electronic compass to compensate for the interference magnetic field to obtain accurate heading information, and the calibration accuracy is not high

Method used

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  • A self-calibrating electronic compass and its calibrating method
  • A self-calibrating electronic compass and its calibrating method
  • A self-calibrating electronic compass and its calibrating method

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Embodiment Construction

[0060] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings, so as to make the technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein.

[0061] In the drawings, components with the same structure are denoted by the same numerals, and components with similar structures or functions are denoted by similar numerals. The size and thickness of each component shown in the drawings are shown arbitrarily, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of parts is appropriately exaggerated in some places in the drawings.

[0062] The electronic compass based on multi-magnetometer mainly includes the following modules according to functions: power suppl...

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Abstract

The invention discloses a self-correcting electronic compass and a method for correcting the same, and relates to the field of inertial navigation. The method comprises the following steps: 1. acquiring magnetic field data; 2. performing Levenberg-Marquardt optimization on the acquired magnetic field data to obtain a soft and hard magnetic correction matrix; 3. completing the calculation of a heading angle based on calculation results of the soft and hard magnetic correction matrix. The invention also discloses the self-correcting electronic compass, which comprises a data acquisition module and a calculation module, wherein the acquisition module is used for acquiring the magnetic field data, and the calculation module is used for performing Levenberg-Marquardt optimization on the acquired magnetic field data to obtain the soft and hard magnetic correction matrix, and completing the calculation of the heading angle based on the calculation results of the soft and hard magnetic correction matrix. According to the self-correcting electronic compass and the method for correcting the same provided by the invention, readings of a magnetometer set are directly compensated and correctedby an L-M optimization theory-based magnetic compass correction algorithm, the convergence speed is fast, and the accuracy of heading calculation of a magnetic field sensor is improved.

Description

technical field [0001] The invention relates to the field of inertial navigation, in particular to a self-correcting electronic compass and a correction method thereof. Background technique [0002] Magnetometers are commonly used sensors in the field of navigation. The Earth's magnetic field varies with latitude, longitude and altitude. As a commonly used magnetic field measuring instrument, the magnetometer calculates the magnetic field strength and heading angle by measuring the component of the surrounding magnetic field in the axial direction of the three-axis magnetometer. like figure 1 As shown, if the horizontal component h of the earth's magnetic field is known x and h y , and the local declination D, then the heading can be represented by the following formula: [0003] [0004] Since the earth's magnetic field is very weak between 50-60μT, although the magnetometer works well in an environment with less magnetic field interference, in actual use, the mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C17/38G01C17/32
CPCG01C17/32G01C17/38
Inventor 赵忠华曹一文鲁兴龙赵新晏懿琳
Owner SHANGHAI JIAOTONG UNIV
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