The Research And Practice Of GPS Baseline Solution And Network Adjustment

GPS application and promotion in the context of the times that speed thedevelopment of information technology has been a great development, and researchtopics of the corresponding GPS data processing has been unprecedented in-depth study.In this paper, GPS data processing software for research and teaching as a starting pointto solving carrier phase double-difference model GPS baseline vector and the baselinevector network adjustment as the main content of the study, taking into account thecomparison of the GPS data processing method by the result solver GPS baseline vectorand coordinate data with commercial software solutions for comparison, meet expectedaccuracy requirements, ultimately reached based on GPS baseline network adjustment ofGPS Baseline Solution software system developed in VS platform purposes.In this paper is to analyze the current GPS data processing at home and abroad,introduces the basic mode of GPS positioning and measurement error, analyzes apply tothe structure and method of programming the GPS data processing, the basic functionsof the program. The most important are the following:1)Read into the GPS data structure, the use of its structural characteristicsreassembled into more of the physical characteristics of the GPS data and the new datato facilitate computer processing of the mathematical properties. Dual frequency carrierphase observations of cycle slip detection and repair. GPS satellite coordinates iscalculated taking into account the satellite coordinates will appear in the adjacent periodambiguity problem and reduce the operational load of the computer method is used whenthe chevyshev polynomials for fitting the calculated coordinates of the broadcastephemeris.2)Explored the fast solution Ambiguity theory.To verify the feasibility of theobservation time is long enough and the baseline length within40km Rounding.3)Systematic description of the model of the double difference GPS baseline vectorand baseline network adjustment formula, to parse each method can be applied tocomputer programming equation coefficients composition data content;4)Elevation fitting, surface fitting method to analyze the results to identify thepoints that may affect the results of factors 5)With commercial GPS data processing software baseline solver and baselinenetwork adjustment results of the analysis to determine not consider the impact ofcurrent and tropospheric delay error baseline.