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Key Technologies Research on GPS Leveling Application

Author: ZhangXueFen
Tutor: LiBin
School: Chang'an University
Course: Geodesy and Survey Engineering
Keywords: GPS leveling Height anomaly Geodetic height Normal Robust Estimation MATLAB
CLC: P228.4
Type: Master's thesis
Year: 2007
Downloads: 123
Quote: 0
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Abstract


GPS (Global Positioning System-GPS) is a U.S. military deployment in the 1990s built a global satellite navigation and positioning system, with no need of sight between the observation point , high positioning accuracy , the observation time is short, providing three-dimensional coordinates , easy to operate and weather operations , etc., have been widely used in construction projects in various fields , and gradually replace some of the traditional methods of measurement. As an efficient real-time , global coverage of satellite positioning technology, GPS positioning accuracy plane and altitude is not enough balance. In large areas , the plane positioning accuracy is difficult to compare with conventional measurement techniques , and in the elevation positioning , GPS can provide us with high-precision geodetic height , rather than engineering applications used in normal height . This makes the GPS technology in engineering applications , especially with the elevation on the application of practical challenges encountered . To improve the positioning accuracy of GPS height and make it meet the engineering application requirements , we need to further study the high and normal GPS geodetic transformation between , the study of the problem and GPS elevation height anomaly appropriate , simple and effective ways and means to achieve engineering applications . In this paper, to learn, to grasp the development of GPS and GPS geodetic height , normal height and high concepts and their relationships are based on an overview of GPS Elevation Fitting principles and common methods ; MATLAB-based platform , focusing on the use of numerical approximation method typical of several fitting methods ( polynomial fitting , multi-faceted function fitting , fitting and moving weighted average surface fitting ) , the measured data of a survey area were fitted calculations ; fitting models in its calculations on a comprehensive comparison and analysis based on the evaluation of the accuracy of the model fitting , and gives specific conclusions and recommendations. GPS height conversion for data outliers and possible fitting model chosen parameters of the problem , the paper model was also robust estimation and parameter optimization , and through examples demonstrate robust estimation and model parameters preferred method applicability and effectiveness . Finally, to the practical needs of engineering applications , the paper also tried a MATLAB-based environment for GPS Leveling Fitting functional integration and application interface development , implementation and provides a reliable calculation software based on professional and convenient GPS leveling fitting problem overall solution .

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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