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Assesment of Galileo High Accuracy Service
Nosek, Jakub ; Douša, Jan ; Václavovic, Pavel ; Kala, Michael
The paper deals with the testing of the Galileo High Accuracy Service (HAS), which will be officially launched in January 2023 as part of the HAS Initial Service phase. The results of the HAS comparison with the precise GNSS product showed a high accuracy of the HAS corrections and the fulfillment of the declared accuracy. Data processing at 3 selected stations of the EUREF Permanent Network showed that the officially declared HAS accuracy (horizontal accuracy 20 cm, vertical accuracy 40 cm) is achievable, but with a longer required convergence time (kinematic processing 22 min, static processing 8 min) than the required convergence time (5 min).
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Testing of Precise Point Positioning Method
Nosek, Jakub ; Kratochvíl, Radim (referee) ; Machotka, Radovan (advisor)
This diploma thesis deals with the Precise Point Positioning (PPP) method in various variants. The thesis describes the theoretical foundations of the PPP method and the most important systematic errors that affect accuracy. The accuracy of the PPP method was evaluated using data from the permanent GNSS station CADM, which is part of the AdMaS research center. Data of the period 2018 – 2019 were processed. The results of combinations of different GNSS and the results of different observation periods were compared. Finally, the accuracy was verified at 299 IGS GNSS stations.
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Aspects of GNSS Processing
Puchrik, Lukáš ; Kostelecký,, Jan (referee) ; Kratochvíl,, Vlastimil (referee) ; Hefty,, Ján (referee) ; Švábenský, Otakar (advisor)
The thesis deals with processing of epoch-wise GNSS measurements from local geodynamic network Sněžník. Its aim is to evaluate the geodynamics in the area of Králický Sněžník Massif and to assess the capabilities of epoch-wise GNSS measurements to detect the geodynamic movements. Within the thesis the comprehensive processing of all the GNSS measurements observed between years 1997 and 2011 is realized using the reprocessed products of first IGS reprocessing Repro1. Bernese GPS software version 5.0 is used for all the processing.
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Precise Real-Time GNSS Positioning Using Different Correction Representation
Nosek, Jakub ; Václavovic, Pavel
The paper deals with the comparison of the Real Time Kinematic (RTK) method and the Precise Point Positioning (PPP) method with fast ambiguity resolution (PPP-RTK). Both methods use different correction models that affect their results. Data from 6 permanent GNSS stations from 28th August 2022 to 30th August 2022 were processed. The results show that the RTK method provides increasingly accurate results (standard deviations of the NEU coordinate components sN = 0.003 m, sE = 0.002 m, sU = 0.006 m). The PPP-RTK method provides slightly worse results (sN = 0.011 m, sE = 0.009 m, sU = 0.028 m). On the other hand, it is more independent of current problems in the network of reference stations.
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Precise Point Positioning with integer ambiguity resolution
Orviská, Terézia ; Václavovic,, Pavel (referee) ; Nosek, Jakub (advisor)
The aim of this diploma thesis is to compare the accuracy and time of convegence of the Precise Point Positioning (PPP) method and PPP with an integer ambiguity resolution and to asses the applicability of the PPP method in estimating earthquake magnitudes. The thesis describes the theoretical foundations of GNSS method PPP, important systematic errors and methods for their elimination. Subsequently, the solution to the practical part is presented. The data are processed from the period of 2020 using 14 selected permanent IGS stations. The PPP computation was preceded by a quality control. In the results, the PPP method with integer ambiguity resolution using uncombined observation exhibited the most consistent and accurate results with the fastest convergence. For magnitude estimation, three earthquakes from the Alaska region during the period of 2020-2021 were selected, and four combinations of methods were examined, with the best results once again provided by the PPP method with integer ambiguity resolution using uncombined observations.
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Testing of Precise Point Positioning Method
Nosek, Jakub ; Kratochvíl, Radim (referee) ; Machotka, Radovan (advisor)
This diploma thesis deals with the Precise Point Positioning (PPP) method in various variants. The thesis describes the theoretical foundations of the PPP method and the most important systematic errors that affect accuracy. The accuracy of the PPP method was evaluated using data from the permanent GNSS station CADM, which is part of the AdMaS research center. Data of the period 2018 – 2019 were processed. The results of combinations of different GNSS and the results of different observation periods were compared. Finally, the accuracy was verified at 299 IGS GNSS stations.
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Aspects of GNSS Processing
Puchrik, Lukáš ; Kostelecký,, Jan (referee) ; Kratochvíl,, Vlastimil (referee) ; Hefty,, Ján (referee) ; Švábenský, Otakar (advisor)
The thesis deals with processing of epoch-wise GNSS measurements from local geodynamic network Sněžník. Its aim is to evaluate the geodynamics in the area of Králický Sněžník Massif and to assess the capabilities of epoch-wise GNSS measurements to detect the geodynamic movements. Within the thesis the comprehensive processing of all the GNSS measurements observed between years 1997 and 2011 is realized using the reprocessed products of first IGS reprocessing Repro1. Bernese GPS software version 5.0 is used for all the processing.
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