Magnet second-order Euler inversion method and scalar magnetometer array

Abstract

The invention provides a magnet second-order Euler inversion method and a scalar magnetometer array. 13 scalar magnetometers form a scalar magnetometer array, and a GPS or a high-precision inertial navigation system is installed; a search region of a magnet is determined, and the position coordinates of the magnet, estimated values of structural indexes and a mean value of total estimation valuesare calculated, and then a nearest neighbor integer value of the mean value is calculated to obtain an inversion value of the structural indexes of the magnet; solution center calculation and iterative screening are carried out on the position coordinate estimation values of the magnet on an updated Kth track section, so as to obtain an inversion value of the position coordinates of the magnet. According to the method, magnetometer array assembling and plane unit replacement are facilitated, and the position coordinates and the structural indexes of the magnet are simultaneously inverted by afirst-order magnetic gradient value and a second-order magnetic gradient value at a plurality of measuring points, the influence of a gross measurement error of the magnetic gradient on the inversionprecision is reduced, and subjective experience selection of the structural indexes and centralization processing of the gradient measurement data are avoided.

Description

technical field [0001] The invention belongs to the field of magnetic target inversion and geological exploration, and in particular relates to a second-order Euler inversion method of a magnet and a scalar magnetometer array. Background technique [0002] The detection and location of magnetic anomalies and their gradients play an important role in geological surveys, mineral surveys, earth science research, identification and location of unexploded explosives and military targets. The emergence of high-precision magnetometers has promoted the innovation of magnetic detection technology, and magnet positioning technology has also developed from traditional deep positioning such as curve matching and matched filtering to spatial positioning such as Euler deconvolution and signal analysis. [0003] The Euler deconvolution method is an important method for processing and interpreting magnetic survey data. D.T.Thompson proposed to use the Euler method, that is, to locate the d...

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Problems solved by technology

[0004] The typical Euler deconvolution method is easy to cause severe divergence of the solution because it does not consider the influence of the geomagnetic background field. The common method to overcome this problem is to treat the background field in the moving window as a constant and solve the nonlinear equations. Given the exact construction of exponential linearization equations

The selection of structure index mostly depends on subjective experience. When the survey area contains multiple types of magnets, the structure index of magnets in each window is not easy to be given in advance; and the wrong structure index or the dynamic change of structure index will also lead to the divergence of the solution. , especially the depth calculation results are more affected by its

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