Digital magnetic compass on-line demarcating method based on geomagnetic model

Abstract

The invention discloses an online calibrating method for a digital magnetic compass based on a geomagnetic model, which aims to solve the problem that the calibrating requirements in a nonmagnetic environment are difficult to meet. The digital magnetic compass calibration comprises a geomagnetic model flux acquisition unit (11), a magnetic compass to be calibrated flux acquisition unit (21), a carrier magnetic course angle acquisition unit (12), a magnetic course angle to be calibrated acquisition unit (22), a magnetic course comparing unit (1) and an ellipsoid hypothesis compensating unit (2). The method adopts the magnetic course algorithmic method to respectively obtain a carrier magnetic compass magnetic course angle psi geomagnetism, and a magnetic compass to be calibrated magnetic course angle psi to be calibrated, and then adopts the ellipsoid hypothesis compensating method to eliminate the difference value delta psi between magnetic course angles to obtain the calibrated soft magnetism model parameterC1 and hard magnetism model parameterC2, and H geomagnetism= C1.H to be calibrated+C2. The calibrating method can calibrate the digital magnetic compass under the condition ofmagnetic field interference.

Description

technical field The invention relates to a digital magnetic compass calibration, more particularly, an online calibration method for a digital magnetic compass using a geomagnetic model in a magnetic environment (magnetic field interference). The calibration method is not restricted by the calibration environment, and the calibration steps are simple. Background technique Due to its advantages in cost, performance, volume and accuracy, the digital magnetic compass is currently widely used in the magnetic heading measurement system, and it is also used in the integrated navigation combined with the inertial navigation system to correct the calculation of the inertial navigation system. heading error, further improving the heading accuracy of the navigation system. The reference of the digital magnetic compass to measure the heading angle of the carrier is the magnetic meridian (that is, the earth's magnetic longitude). When the digital magnetic compass is installed on the ...

AI Technical Summary

Problems solved by technology

This method can effectively eliminate the influence of hard magnetic materials, but the calibration environment is demanding, and the general experimental environment is difficult to meet, so the calibration experiment is difficult to complete

At the same time, this method cannot eliminate the influence of soft magnetic materials. In actual use, data processing methods are often used to eliminate the influence of soft magnetic materials on the magnetic field.

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