Gravity level surface and global position system (GPS) level difference decomposition and fusion method

Abstract

The invention discloses a gravity level surface and global position system (GPS) level difference decomposition and fusion method and belongs to the technical field of geodesy and surveying engineering. The gravity level surface has high resolution ratio and system deviation, the GPS has high level precision and low resolution ratio, and the gravity level surface and GPS have to be fused during application. Because the ground level surface is irregular in shape and is complex, while ruled surfaces are obtained in the conventional domestic and international polynomial, spherical harmonic and function fitting methods, and the precision and resolution are difficultly improved. The method comprises the following steps of: removing the system deviation of the gravity level surface and the GPS level, moving and interpolating a residual error part through a magnifying glass principle by employing a minimum curvature Green primary function spline, forming a residual error grid with the same resolution ratio as the gravity level surface, superposing the residual error grid, the system deviation and the gravity level surface grid, and forming a final GPS level and gravity ground level surface. The method has the advantages that the method is high in precision, is not constrained by the resolution ratio, can process various ground level surfaces with optional size and complex shape, and can be widely applied to a ground level surface modeling.

Description

technical field [0001] The invention is a new method for decomposing and integrating the difference between the gravity geoid and the GPS level, and belongs to the technical field of "physical geodesy" in the subject of "geodesy and surveying engineering". Background technique [0002] With the development of modern geodetic technology and the continuous expansion of its application in geophysics, oceanography and other disciplines, it is an urgent task to solve modern surveying and mapping production and geoscience scientific research experiments to establish high-precision and high-resolution geoid models. In order to meet the high requirements of geoscientific applications, the geoid resolution and accuracy need to be continuously improved. The regional geoid modeling process is based on the global earth's gravity field, combined with various gravity observation data and high-resolution digital terrain models, through rigorous calculation to form a gravity geoid, and t...

AI Technical Summary

Problems solved by technology

[0003] Gravity geoid has high resolution but has systematic deviation and low precision. GPS level has high precision but low resolution. In practice, the two must be fused

The shape of the difference between the gravity geoid and the GPS level is irregular and very complicated. At present, polynomial functions, spherical harmonic functions and other fitting methods are used at home and abroad, but the obtained is a regular surface, so the model has a regular approximation

There are theoretical and methodological shortcomings in using regular functions to construct an irregular surface, and it is facing great difficulties to further improve the resolution and model accuracy

Images