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A Gravity Bouguer Correction Method of Polyhedron Subdivision in Dynamic Coordinate System

A calibration method and coordinate system technology, which can be used in the measurement of gravitational fields, instruments, complex mathematical operations, etc. It can solve the problems of complex terrain effects, and achieve the effect of improving accuracy and reducing approximate calculations.

Active Publication Date: 2021-08-10
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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  • A Gravity Bouguer Correction Method of Polyhedron Subdivision in Dynamic Coordinate System
  • A Gravity Bouguer Correction Method of Polyhedron Subdivision in Dynamic Coordinate System
  • A Gravity Bouguer Correction Method of Polyhedron Subdivision in Dynamic Coordinate System

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Embodiment Construction

[0035] The present invention will be clearly and completely described below in conjunction with the accompanying drawings, so that those skilled in the art can fully implement the present invention without creative work.

[0036] The specific embodiment of the present invention is: a dynamic coordinate system polyhedron subdivision gravity Bouguer correction method, comprising:

[0037] 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;

[0038] The equation for transforming coordinates of the mass body is...

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Abstract

The invention provides a dynamic coordinate system polyhedron subdivision gravity Bouguer correction method, including: coordinate system conversion: transforming the mass body above the geoid to the correction point as the origin, the east direction as the x direction, and the north direction is the y direction, in the dynamic Cartesian coordinate system with the direction away from the center of the earth as the z direction; mass polyhedron subdivision: the mass body converted in step 1 is cut into multiple fine mass bodies with a rectangular grid, and according to each mesh The elevation characteristics of the 4-point nodes cut by the grid can be divided into six situations, and the six situations are subdivided into multiple tetrahedrons; the calculation of the polyhedron gravity value correction amount: first determine the outer normal direction of the integration plane , and then use the Gaussian principle coordinate conversion formula or vector calculation formula to calculate the polyhedral gravity value; verification and examples: use simulated data and actual data for verification to determine the correctness of Bouguer gravity anomaly correction. The invention improves the accuracy of Bouguer correction.

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 polyhedron subdivision in a dynamic coordinate system. 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 dr...

Claims

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Application Information

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Patent Type & Authority Patents(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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