Three-axial magnetometer correcting method and three-axial magnetic gradient correcting method

Abstract

The invention relates to a magnetometer correcting method and a magnetic gradiometer correcting method, in particular to a three axis magnetometer correcting method and a three axis magnetic gradiometer correcting method. Under the conditions of no standard three-axis coil, no standard magnetic field and no normalized three-axis magnetometer, the invention corrects the error and carrier magnetic interference generated due to the inconsistent nonorthogonality, interaxial coupling and sensitivity of the three axis magnetometer and the three axis magnetic gradiometer. The invention adopts an ordinary three-axis coil, a scalar quantity magnetometer and a high precision current source to form a correcting device which has the correcting precision at the same order of magnitude as the single axis test precision of a corrected three axis magnetometer. The invention does not need to turn a corrected three axis magnetometer and a corrected three axis magnetic gradiometer during correcting, thereby having a simple operation process and high correcting precision and improving the test precision of magnetic field vector by the three axis magnetometer and the three axis magnetic gradiometer.

Description

technical field [0001] The invention relates to a magnetometer calibration method and a magnetic gradiometer calibration method, in particular to a three-axis magnetometer calibration method and a three-axis magnetic gradiometer calibration method. Background technique [0002] Due to the machining and assembly errors of the three-axis magnetometer and the three-axis magnetic gradiometer probe, the coil winding error, the asymmetric error of the magnetic core, etc., the three magnetic axes are not orthogonal and have mutual coupling effects, and the three-axis sensitivity also exists. The slight difference, which will seriously affect the vector test accuracy of the three-axis magnetometer and three-axis magnetic gradiometer, must be corrected. The correction methods currently used mainly include: [0003] 1. Operate the magnetometer to rotate in all directions in the geomagnetic field to make it "experience in all directions" as much as possible, and form an equation with ...

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Problems solved by technology

[0007] Another purpose of the present invention is to solve the technical problems existing in the prior art that the operating time is long, the site area is too large, the background magnetic field may change and cause errors, and the turntable requires non-magnetic and precise rotation requires too high equipment requirements. ; Provide a three-axis magnetometer calibration method and a three-axis magnetic gradiometer calibration method with short operation time, small site area requirements, and low equipment requirements

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