Digital magnetic compass demarcating method in magnetic field
A calibration method and magnetic compass technology, applied in compass, measuring device, surveying and navigation, etc., can solve the problems of difficult calibration experiments, harsh calibration environment requirements, and inability to eliminate the influence of soft magnetic materials, etc., to achieve fast calculation speed, Easy to operate and eliminate the effect of magnetic heading angle error
Inactive Publication Date: 2010-06-30
BEIHANG UNIV
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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.
Method used
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Embodiment
[0077] The digital magnetic compass calibrated by the present invention is installed on an aircraft, if the aircraft flies at an altitude of 1000m and at a speed of 300km / h, the magnetic flux measurement is carried out at twenty-two positions in space successively, and the flight conditions are as follows: image 3 As shown, it is obtained from the analysis of the flight situation that the digital magnetic compass calibrated by the present invention makes the positioning accuracy of the flight course of the aircraft within the range of -4 to +5 degrees.
[0078] The coordinates of the twenty-two positions in the space indicated by the present invention are briefly shown as figure 2 As shown, the description for each position is as follows:
[0079] first position
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The invention discloses a calibrating method for a digital magnetic compass in a magnetic environment, and aims to solve the problem that the calibrating requirements in a nonmagnetic environment are difficult to meet. The digital magnetic compass calibration comprises a reference magnetic compass flux acquisition unit (11), a magnetic compass to be calibrated flux acquisition unit (21), a reference 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 reference magnetic compass magnetic course angle psi reference, 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 reference = C1.H to be calibrated+C2. The calibrating method can calibrate the digital magnetic compass under the condition of magnetic field interference.
Description
technical field [0001] The present invention relates to a calibration method for a digital magnetic compass, more particularly, a calibration method for a digital magnetic compass 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 [0002] 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. [0003] 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 instal...
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IPC IPC(8): G01C17/38
Inventor 富立李娟王玲玲
Owner BEIHANG UNIV