Bionic polarized light compass and micro-inertial assisted three-axis magnetometer calibration method and device

Through the bionic polarized light compass and micro-inertial sensor-assisted three-axis magnetometer calibration method, the problem of degradation of geomagnetic heading accuracy in the prior art is solved, and the high-precision calibration of the three-axis magnetometer and the overall accuracy of the navigation system are improved.

CN119469209BActive Publication Date: 2025-03-18NAT UNIV OF DEFENSE TECH
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Patent Information

Application Number
CN202510065032.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-15
Publication Date
2025-03-18
Estimated Expiration
2045-01-15

AI Technical Summary

Technical Problem

When obtaining the heading information of the carrier, the prior art has the problem of decreasing orientation accuracy, especially when the electromagnetic environment changes, the accuracy of the heading direction of the geomagnetic will significantly decrease, and magnetometer calibration is required, but the commonly used elliptical calibration methods require high maneuverability of large carriers.

Method used

The calibration method of bionic polarized light compass and micro-inertial sensor assists the three-axis magnetometer. The heading angle information provided by the bionic polarized light compass assists the micro-inertial sensor to complete the initial alignment. The attitude change and acceleration obtained by the micro-inertial sensor are used to solve the horizontal attitude angle, and the horizontal attitude information is provided for the bionic polarized light compass and three-axis magnetometers. A model of polarized light heading assisted three-axis magnetometer calibration is established, and the compensation coefficient is determined based on the polarized light heading and the measured value of the three-axis magnetometer to realize the calibration of the three-axis magnetometer.

Benefits of technology

High-precision calibration of three-axis magnetometers is realized, the overall accuracy of the navigation system is improved, the requirements for maneuverability of large platforms are reduced, and the applicability of the combined navigation system is improved in different application environments.

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Abstract

The present invention proposes a calibration method and device for a bionic polarized light compass and a micro-inertial assisted three-axis magnetometer, which uses the heading angle information provided by the bionic polarized light compass to assist the micro-inertial sensor in completing the initial alignment, thereby realizing the rapid acquisition of the initial attitude matrix; the attitude change and acceleration obtained by the micro-inertial sensor that has completed the initial alignment are used to resolve the horizontal attitude angle, thereby providing the bionic polarized light compass and the three-axis magnetometer with horizontal attitude information, thereby ensuring that the bionic polarized light compass and the three-axis magnetometer can be used normally under tilt conditions. A model for the calibration of the three-axis magnetometer assisted by the polarized light heading is established, and the compensation coefficient is determined according to the polarized light heading and the three-axis magnetometer measurement value, and error compensation is performed to realize the calibration of the three-axis magnetometer. The present invention can still realize the geomagnetic heading calibration without performing the elliptical calibration, thereby improving the applicability of the combined navigation system in different application environments.
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Citation Information

Patent Citations

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