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Single Frequency And Single Epoch GPS Positioning Algorithm With Baseline Constraint

Posted on:2015-06-30Degree:MasterType:Thesis
Country:ChinaCandidate:T F WuFull Text:PDF
GTID:2180330422485922Subject:Surveying and mapping engineering
Abstract/Summary:PDF Full Text Request
Nowadays, GPS precise dynamic positioning accuracy to meet the user s requirements,compared to GPS precise static positioning, which can provide users with real-time accurateinformation such as velocity, location, stance and so on. When using single-frequency GPSreceiver measurements and positioning, its hardware cost is relatively low, and also getaccurate positioning and measurement results. Therefore, the study belong to the scope of theGPS precise dynamic positioning GPS single frequency single epoch positioning algorithmhas important theoretical and practical significance. For single-frequency GPS dynamicpositioning problems, this paper focuses on the baseline constraint with single epoch singlefrequency GPS positioning algorithm. In this paper, the main research work commenced andthe results obtained are as follows:(1) This paper introduces the basic theory of GPS data processing, discusses thepseudorange and carrier, and other important observation, simply introduces the SD、 DDand TD operation, and the observation equations linearization.(2) For rapid positioning, the gross error in the measurement data, and the normalequations ill conditioned, robust estimation TIKHONOV method is applied to the GPS singlefrequency single epoch positioning algorithms, numerical results show that this method notonly can decrease data that exist in the gross error influence on parameter calculating results,but also can improve the normal matrix ill-posed, improve the reliability of the results.(3) For GPS single epoch single frequency positioning ambiguity success rate problemfixed quickly, based on the LAMBDA algorithm proposed GPS single frequency single epochalgorithm with additional known baseline. The algorithm baseline after additional constraintinformation, no longer use the traditional method of ratio values tested, using the three-stepsearch method, twice expanded integer ambiguity candidate set, final confirmation integerambiguity and improve the integer ambiguity fixing the success rate.(4) Preliminary developed with baseline constraint of GPS single frequency single epochpositioning program, the calculation results show that the positioning result is smooth,positioning accuracy can reach levels cm or mm, can meet the needs of general engineeringapplications.
Keywords/Search Tags:GPS, Single frequency, Single epoch algorithm, Baseline constraint, LAMBDA algorithm
PDF Full Text Request
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