Research On High-Precision GPS Data Processing And Integer Ambiguity Search Algorithm

With the development and improvement of GPS positional techniques, the application areas of high-precision GPS measurements are increasingly wide. It include both the crustal deformation monitoring or geocentric reference frame establishing scaled up to dozens or even thousands of kilometers, and the field of precision engineering which baseline length only several kilometers or even several dozens to hundreds meters. The research of this paper using high-precision data processing GAMIT/GLOBK package as the main tool and the GPS data which from several sites of SZCORS and the United States continuously operating reference station system, LAMBDA (least squares decomposition method associated reduction) algorithm is better In the current application,we analysis the key points of LAMBDA which is the Ambiguity decorrelation. the main research contents of this paper are as follows:(1) The reference frame, ephemeris, accuracy analysis methods, data processing models are introduced detailedly when processing high-precision GPS network data. the latest developments of the current international GPS data processing and its impact on the positioning results are analyzed.(2) According to the characteristics of the small regional high-density and continuous observation of the SZCORS network, and through a large number of the practical calculations, the optimization of the initial coordinates of the unknown point, the choice of the IGS stations using GAMIT, the choice of the base stations using GLOBK are discussed and researched. and,a more reasonable calculation scheme is introduced.(3) We described the basic principle for solving integer Ambiguity, and analysis the basic principles of the present better efficiency way in solving the integer Ambiguity LAMBDA (least squares decomposition method associated reduction),then,analysis the key points of LAMBDA which is the Ambiguity decorrelation.(4) Using the whitening filter as the basis, we associated the permutation matrix to the whitening filter decorrelation algorithm—sort whitening filter decorrelation algorithm, and with the help of MATLAB programming language, by the specific experimental calculate,comparing theways of sort whitening filter decorrelation algorithm algorithm;integer gaussian decorrelation algorithm; correlation decorrelation algorithm and whitening filter decorrelation algorithm,the results show that the sort whitening filter decorrelation algorithm has better applicability and effectiveness compare with others.