Method for acquiring horizontal component of gravity field
A horizontal component and acquisition method technology, applied in the direction of measuring gravitational field, measuring device, geophysical measurement, etc., can solve the problems of low calculation efficiency, low calculation accuracy of wave number domain method, and inability to guarantee calculation efficiency and calculation accuracy at the same time, to achieve The effect of ensuring stability and improving calculation accuracy
Active Publication Date: 2019-01-29
GUILIN UNIVERSITY OF TECHNOLOGY
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However, due to the singularity of the wavenumber domain conversion operator at the zero wavenumber point, the calculation accuracy of the wavenumber domain method is low
Different from the wavenumber domain method, the literature (Bingzhu Wang, Edward S. Krebes, Dhananjay Ravat. High-precision potential-field and gradient-component transformations and derivative computations using cubic B-splines. Geophysics, 2008, 73(5): I35-I42. ) discloses a gravity field component conversion method of cubic B-spline function in space domain, which effectively improves the calculation accuracy of gravity field component conversion, but the calculation efficiency is low
[0004] The biggest problem existing in the existing methods for obtaining the horizontal component of the gravity field is that they cannot guarantee the calculation efficiency and calculation accuracy at the same time, and cannot meet the requirements of fast and high-precision gravity field component conversion in the case of large-scale data.
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[0067] The method in the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0068] refer to figure 1 , the present invention provides a method for obtaining a horizontal component of a gravitational field, comprising the following steps:
[0069] Step 1: Set the application scenario
[0070] refer to figure 2 , to establish a Cartesian coordinate system, and the z-axis is positive vertically downward;
[0071] Given a regular grid gravity vertical component graph, the regular grid gravity vertical component graph has M grid nodes equally spaced in the x direction, and N grid nodes equally spaced in the y direction, so that the regular grid gravity There are M×N grid nodes on the vertical component graph, and M×N grid nodes correspond to M×N gravity vertical component data.
[0072] The gravity vertical component data corresponding to M×N grid nodes on the regular grid gravity vertical component graph is recorded as...
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To solve the problem that the wave number domain method based on the fast Fourier transform algorithm has low computational precision due to the singularity of the wave number domain operator in a zero wave number, the present invention discloses a method for acquiring a horizontal component of a gravity field. The method realizes the fast and high-precision calculation of the vertical component to the horizontal component of the gravity field by setting an application scenario, the weighting coefficient calculation, and a two-dimensional discrete convolution fast algorithm, and realizes unification of the computational efficiency and the computational accuracy of the component conversion under the condition of large-scale gravity measurement data. The method solves the problem that the traditional wave number domain method has low accuracy of horizontal component calculation due to the singularity of the wave number domain conversion operator in the zero wave number, and provides a method support for satisfying large-scale gravity data processing, inversion and interpretation.
Description
technical field [0001] The invention relates to a method for obtaining a gravitational field component applied in the field of gravity exploration, in particular to a method for obtaining a horizontal component of a gravitational field. Background technique [0002] A gravimeter, commonly used in gravity exploration, measures the vertical component of the gravitational field. The gravity vertical component data has a strong resolution ability for the deep information of geological anomalies. Restricted by the level of instruments, gravimeters for measuring the horizontal component of the gravitational field are not widely used at present. The horizontal component of the gravity field has a good ability to distinguish the horizontal boundary of the abnormal body. Comprehensive utilization of the three-component information of the gravity field can improve the interpretation effect of gravity exploration data. [0003] According to the classical potential field theory, ther...
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IPC IPC(8): G01V7/00
CPCG01V7/00
Inventor 陈龙伟陈欣张钱江熊彬刁云云
Owner GUILIN UNIVERSITY OF TECHNOLOGY