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Geomagnetism vector system non-alignment correction method based on axis rotating method

A calibration method and non-alignment technology, applied in the field of magnetic measurement, which can solve problems such as high requirements for operating experience, affecting calibration accuracy, and complex equipment and operations.

Active Publication Date: 2015-03-25
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] All in all, the correction methods for the misalignment angle error of the above-mentioned geomagnetic vector system all have shortcomings such as complex equipment and operation, and require high operating experience for experimental equipment and researchers, or need to provide accurate attitude information, which affects the correction accuracy

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  • Geomagnetism vector system non-alignment correction method based on axis rotating method
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  • Geomagnetism vector system non-alignment correction method based on axis rotating method

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Embodiment Construction

[0048] In order to better understand the technical scheme of the present invention, its principle and calculation formula are now described in detail as follows:

[0049] The misalignment error correction method used in the geomagnetic vector measurement system of the present invention is as follows: the magnetic sensor 5 and the accelerometer 6 are packaged in a non-magnetic regular hexahedron 4, and the coordinate system relationship of the two sensors is indirectly transformed into the non-magnetic regular hexahedron The relationship of the coordinate system 9 ; the non-magnetic regular hexahedron 4 is placed on the non-magnetic turntable table 3 . When the non-magnetic regular hexahedron 4 is rotated, the magnetic field vector rotation axis projection 7 can be analytically expressed by the measured value of the magnetic sensor 5 and the misalignment angle during the rotation process. The misalignment error angle is an unknown parameter, and the non-linear equations are est...

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Abstract

The invention belongs to the technical field of magnetic measurement and particularly provides a geomagnetism vector system non-alignment correction method based on an axis rotating method. The method comprises the following steps that 1, a non-magnetic rotating table is arranged; 2, a magnetic sensor and an acceleration meter in a geomagnetism vector system are packaged into a non-magnetic regular hexahedron; 3, the non-magnetic regular hexahedron is arranged on a table board of the non-magnetic rotating table to ensure that the X-axis direction of the non-magnetic regular hexahedron is identical with the direction of a rotating shaft, and the rotating shaft rotates around the X-axis for N1 times to obtain N1 sets of measurement values of the magnetic sensor and the acceleration meter; 4, the Z-axis direction of the non-magnetic regular hexahedron is kept to be identical with the direction of the rotating shaft, and the rotating shaft rotates around the Z-axis for N2 times to obtain N2 sets of measurement values of the magnetic sensor and the acceleration meter; 5, the non-alignment angle from the magnetic sensor to the non-magnetic regular hexahedron and the non-alignment angle from the acceleration meter to the non-magnetic regular hexahedron are calculated respectively; 6, correction is finished by determining the coordinate converting relation between the magnetic sensor and the acceleration meter.

Description

technical field [0001] The invention belongs to the technical field of magnetic measurement, and in particular relates to a non-alignment error correction method for a geomagnetic vector measurement system. Background technique [0002] The three-axis magnetic sensor is widely used because it can provide component information, and its measurement value is the projection size of the geomagnetic field on the three sensitive axes of the magnetic sensor. If the Euler angle relationship between the rectangular coordinate system formed by the three sensitive axes of the magnetic sensor and the geographic coordinate system is known, the geomagnetic components in the geographic coordinate system can be calculated: the geomagnetic field northward component, eastward component, and vertical component. How to effectively obtain the geomagnetic component in the geographic coordinate system is the problem of geomagnetic vector measurement, and the geomagnetic vector measurement is comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V13/00G01C25/00
Inventor 庞鸿锋张琦万成彪朱学军潘孟春陈棣湘罗诗途田武刚何赟泽
Owner NAT UNIV OF DEFENSE TECH
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