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Dynamic coordinate system polyhedron subdivision gravity Bouguer correction method

A correction method and coordinate system technology, applied in the direction of measuring the gravitational field, measuring devices, instruments, etc., can solve the problem of complex terrain influence, achieve the effect of improving accuracy and reducing approximate calculation

Active Publication Date: 2020-04-07
NORTHWEST UNIV
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  • Application Information

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Problems solved by technology

The effects of instrument, time, altitude, and latitude are relatively simple to deal with, while the effects of terrain are more complicated

Method used

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  • Dynamic coordinate system polyhedron subdivision gravity Bouguer correction method
  • Dynamic coordinate system polyhedron subdivision gravity Bouguer correction method
  • Dynamic coordinate system polyhedron subdivision gravity Bouguer correction method

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specific Embodiment approach

[0034] The specific embodiment of the present invention is: a dynamic coordinate system polyhedron subdivision gravity Bouguer correction method, comprising:

[0035] 1. Transformation of the coordinate system: such as figure 1 As shown, the mass body above the geoid is transformed into a dynamic rectangular coordinate system with the calibration point as the origin, the east direction as the x direction, the north direction as the y direction, and the direction away from the center of the earth as the z direction. The change of the point, so the Cartesian coordinates are dynamically changed, and the origin of the coordinates is also different with the difference of the correction point;

[0036] The equation for transforming coordinates of the mass body is:

[0037]

[0038] Among them, θ is the longitude of the calibration point, is the latitude of the correction point, R is the radius of the earth, h is the elevation of the correction point, B is the mass body above t...

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Abstract

The invention provides a dynamic coordinate system polyhedron subdivision gravity Bouguer correction method. The method comprises the steps: coordinate system conversion, wherein a mass body above thegeodetic level is converted into a dynamic rectangular coordinate system with a correction point as the original point, the east direction as the x direction, the north direction as the y direction and the direction deviating from the geocentric as the z direction; mass polyhedron subdivision, wherein the mass body converted in the first step is cut into a plurality of small mass bodies through rectangular grids, according to the elevation characteristics of four-point nodes cut by each grid, the mass body can be divided into six conditions, and secondary division is conducted on the six conditions to divide the mass body into a plurality of tetrahedrons; polyhedral gravity value correction value calculation: firstly, determining the outer normal direction of an integral plane, and then calculating a polyhedral gravity value by utilizing a Gaussian principle coordinate transformation formula or a vector calculation formula; and verification and instance: adopting the simulation data and the actual data for verification, and determining the correctness of the Bouguer gravity anomaly correction. According to the invention, the Bouguer correction precision is improved.

Description

technical field [0001] The invention belongs to the technical field of gravity Bouguer anomaly correction, and in particular relates to a gravity Bouguer correction method for dynamic coordinate system polyhedron subdivision. Background technique [0002] Bouguer gravity anomalies are important data for delineating energy minerals, determining fracture systems, determining density interface fluctuations, inverting three-dimensional density structures, etc., analyzing structural geometry characteristics, and then discussing kinematics, dynamics, and structural evolution. The gravity anomaly is extremely small compared to the normal gravity field value. In order to ensure the accuracy and reliability of the geological information obtained from the gravity data, it is particularly important to ensure the accuracy of the Bouguer gravity data. Try to improve the precision of each step of processing. [0003] The measured gravity value in the field is affected by the zero drift o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V13/00G01V7/00G06F17/11
CPCG01V7/00G01V13/00G06F17/11
Inventor 王兆国刘池阳王建强
Owner NORTHWEST UNIV
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