Abstract
Considering that diurnal variation interferes with three-component magnetic surveys, which inevitably affects survey accuracy, exploring an interference compensation method of high-precision is particularly desirable. In this paper, a compensation method for diurnal variation is proposed, the procedure of which involves calibrating the magnetometer error and the misalignment error between magnetometer and non-magnetic theodolite. Meanwhile, the theodolite is used to adjust the attitude of the magnetometer to unify the observed diurnal variation into the geographic coordinate system. Thereafter, the feasibility and validity of the proposed method were verified by field experiments. The experimental results show that the average error of each component between the observed value of the proposed method and that of Changchun Geomagnetic station is less than 1.2 nT, which indicates that the proposed method achieves high observation accuracy. The proposed method can make up for the deficiency that traditional methods cannot meet the requirements of high accuracy diurnal variation compensation. With this method, it is possible for us to set up temporary diurnal variation observation station in areas with complex topography and harsh environment to assist aeromagnetic three-component survey.
Highlights
Compared with the scalar magnetic survey, three-component magnetic survey can obtain richer magnetic information, facilitate making quantitative interpretation of magnetic anomaly and enhance the resolution of magnetic target positioning, which plays an important role in geological survey, mineral exploration and earth science research [1,2,3,4,5]
The magnetic survey accuracy is inevitably decreased by diurnal variation, making it of great importance to develop an effective method for interference compensation
Aiming at the reduction of the diurnal variation in three-component magnetic survey, a compensation method is proposed in the paper
Summary
Compared with the scalar magnetic survey, three-component magnetic survey can obtain richer magnetic information, facilitate making quantitative interpretation of magnetic anomaly and enhance the resolution of magnetic target positioning, which plays an important role in geological survey, mineral exploration and earth science research [1,2,3,4,5]. The magnetic survey accuracy is inevitably decreased by diurnal variation, making it of great importance to develop an effective method for interference compensation. The magnetic field measured by tri-axial magnetometer can be modeled as the sum of three components hm = h g + hi + ho. Where hm denotes the measured data, h g denotes the geomagnetic field, hi denotes the magnetic interference field, and ho denotes the diurnal variation interference. In practice of three-component magnetic survey, the first component is considered as a valuable element while the other two components are as magnetic interference.
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