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Present Activities of Land Survey Office Within the Maintenance of Geodetic Control
Řezníček, Jan
Activities of the Land Survey Office within the maintenance of geodetic controls are legislatively defined by the legal and technical regulations and further specified by the actual conception of the land surveying, which is based on the actual needs, formed not only on the national level, but also based on the internationals trends, requirements and cooperation (IAG, EuroGeographics, cross-border cooperation, …).
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Accuracy analysis of current GNSS sensors
Jabůrek, Ondřej ; Sláma, Jiří (referee) ; Bureš, Jiří (advisor)
The purpose of this thesis is to test and analyze the accuracy of detemining the position and heights of contemporary GNSS receivers in RTK mode using the network of permanent stations CZEPOS with VRS3 - iMAX - MSM product. The test procedures are intended to provide representative results with potential use in conventional surveying applications. The goal of the thesis is to obtain measured data, analyze this data and evaluate the results. Based on this results we should be able to compare the tested devices. The comparison is intended to carry out an information that will help us to select a more suitable receiver for a particulat application in the common practice of surveyor.
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Testing of the accuracy of the heights determined by GNSS
Kordasová, Klára ; Drápela, Zdeněk (referee) ; Kuruc, Michal (advisor)
The aim of this thesis is to test the accuracy of the heights measured by GNSS RTK with service providers CZEPOS and Trimble VRS Now. The thesis deals with precise of height measurement with the influence of surrounded obstacles, such as multipath, fading with the tall buildings, presence of high-voltage lines, limited shadow horizons at the edge of the forest, and measurement under the ideal conditions. The work also deals with the comparison of the period initialization of these monitored conditions. In the locations mentioned a network of test points was built. For measuring GNSS Leica System 1200 apparatus was used. It was measured always five times in five-second epochs and three times twenty-second epochs for each provider in five locations and thirty points during the mornings and afternoons. For independent height comparison the technical levelling was used. The outcome can be applied in practical use.
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Accuracy of Real Time Kinematic Method in Building of Geodetic Control
Nosek, Jakub ; Kuruc, Michal (referee) ; Bárta, Ladislav (advisor)
The aim of this bachelor thesis was to evaluate the accuracy of the RTK method in the creation of point fields. The RTK-measurement was carried out near the Faculty of Civil Engineering, Technical University in Brno, and near Jedovnice, by using the CZEPOS network and the Trimble VRS Now Czech network. These two locations have made it possible to assess the effect of receivers distance to the reference stations on measurement accuracy. At each point, two continuous coordinate records were executed by the RTK method after 10 seconds during 10 minutes. The graphs were compared to the coordinate differences of the pairs of independent measurements. The results of the RTK method were tested against the reference values determined by the common equalization of the measurement results of the fast static method and the terrestrial measurements by the total station using the LSM. The bachelor thesis also includes a comparison of the results of the transfer of spatial coordinates ETRF2000 to S-JTSK using precise global transformation performed by several transformation programs.
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GNSS-RTK Precise Positioning for Engineering Applications
Grečnár, Jiří ; Talácko,, Milan (referee) ; Bureš, Jiří (advisor)
The thesis deals with precision analysis, process optimization and repeatibility of GNSS-RTK measurements for surveying aplication. Measuring procedure, that enables determination of a spatial position with a permissible deviation less than 10mm, was tested based on previous published findings. The test procedure was tested on two sets of test measurements obtained during 27 h and 26 h observations in connection with CZEPOS. The results were later analyzed. The first set of measurements was measured by the RTK3-GG method (9 m and 60 km vectors) and computed by a network solution VRS3-MAX-GG. Both were in ideal conditions – ideal, not obstructed observational horizon and good availability of differential corrections. The second set was measured by RTK3-GG method (22 km and 62 km vectors) and computed by network solution VRS3-MAX-GG. Both were in adverse conditions - obstructed observational horizon and adverse availability of differential corrections. Precision analysis and design of appropriate filtering method and optimal measurement procedure were done based on the results obtained from the test measurements. Optimal measurement procedure was then tested by measurements in a three point network.
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The Evaluation of RTK method precision
Horák, Aleš ; Volařík, Tomáš (referee) ; Kuruc, Michal (advisor)
The aim of this diploma thesis was to evaluate a precision of spatial position of chosen services from Czepos and TopNET providers. The chosen services were virtual reference station generated by MAC concept from Czepos provider and virtual reference station NVR3 from TopNET provider. Testing measurement was measured by RTK method with GNSS instrument from Leica System 1200. There were measured long-standing observations which lasts 24 hours and short observations which lasts five and twenty seconds. The short observations were measured at five points in area of Brno. Result of the thesis is comparisons of precisions in position and height.
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Aktivity ČR spojené s činností EUREF v období 2006-7. Národní zpráva
Douša, J. ; Filler, V. ; Kostelecký Jr., J. ; Kostelecký, J. ; Palinkáš, V. ; Šimek, J. ; Řezníček, J. ; Schenk, Vladimír ; Mantlík, František ; Schenková, Zdeňka
Implementation of EUREF in the CR, EPN stations in the CR, Czech National Positioning Systém CZEPOS, permanent GNSS networks GEONAS, VESOG and TOPNET, Vertical Reference and Gravity Reference Frames in the CR.
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