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Magnetic gradiometer correction method based on magnetic gradient invariants

A technology of magnetic gradiometer and calibration method, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve the problems of scale factor error, difficulty in uniform expression, installation error, etc., and achieve the effect of reliable measurement data

Inactive Publication Date: 2017-08-01
JILIN UNIV
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Problems solved by technology

[0008] Second, due to the scale factor error, non-orthogonal error, installation error and zero bias of the magnetic field vector meter used as a reference, it also needs to be strictly calibrated
The errors in the magnetic gradient components obtained by different measurement methods are different, and it is difficult to express them uniformly
Most of the existing technologies are still in the first stage, and there is no easier method for the second stage of correction

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0033] A magnetic gradiometer calibration method based on magnetic gradient invariants, comprising the following steps:

[0034] Step 1, modeling the tensor error in two-dimensional space;

[0035] Step 2, expanding from two-dimensional space to three-dimensional space to model the tensorometer error;

[0036] Step 3, establishing a calibration compensation model;

[0037] Step 4, using the magnetic dipole to first perform rotation correction data;

[0038] Step 5, using the magnetic gradient invariant characteristic to obtain the correction coefficient through the least square method;

[0039] Step 6. Carry out survey line data measurement, assemble the tensor instrument on the aircraft, let the aircraft perform the designed survey line for flight, and the tensor instrument collects the magnetic field data on the survey line;

[0040] Step 7: Calibr...

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Abstract

The invention relates to a magnetic gradiometer correction method based on magnetic gradient invariants. Modeling of scale factor errors, non-orthogonal errors, non-alignment errors, and zero offset errors existing during construction of tensor instrument is carried out. With help of a scaler constraint method during a magnetic vector instrument correction, two independent rotation invariants of the magnetic gradient tensor are used for the constraint, and then an optimal correction parameter is acquired. By starting from the integrated errors of the tensor instrument, the modeling of the errors of the tensor instrument is carried out, and the two independent rotation invariants of the magnetic gradient tensor are used for constraint, and then the optimal correction parameter is acquired. The errors of the tensor instrument are corrected more intensively, and measured data is more reliable. Compared with conventional tedious and complicated tensor instrument error correction methods, the magnetic gradiometer correction method is advantageous in that the result of the measured data is processed directly, and no other data is required, and use is more convenient; and in addition, the magnetic gradiometer correction method can be used in field environment provided with a geomagnetic field without being limited by various magnetic gradient measurement principles, and also can be used in magnetic shielding environment.

Description

[0001] Technical field: [0002] The invention relates to a correction of a magnetic measuring instrument in geophysical prospecting, in particular to a correction method of a magnetic gradiometer based on a magnetic gradient invariant. [0003] Background technique: [0004] The scientific research and production practice related to the magnetic field under the earth's magnetic field has developed from the early measurement of the total magnetic field and magnetic field vector to the current measurement of the magnetic gradient tensor. A magnetic gradiometer is a device used to measure the spatial gradient of a magnetic field [Pedersen L B, Rasmussen T M. The gradient tensor of potential field anomalies: Some implications on data collection and data processing of maps. Geophysics, 1990, 55(12): 1558- 1566.]. The magnetic gradient tensor has the following advantages: there is no problem of extreme sensitivity to the direction of the ambient magnetic field in the magnetic field...

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Application Information

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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 随阳轶刘世斌周志坚王言章程德福
Owner JILIN UNIV
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