Analysis of the time series of station coordinates - a comparison of the network and PPP approach

Based on the example of fourteen selected permanent GNSS stations of the EPN (EUREF Permanent Network) the differences of time variations of coordinates – velocities – resulting from the network and PPP (Precise Point Positioning) solution are studied. In both approaches the coordinates are determinated using the Bernese software version 5.2. The time series analysis is made using the modified Vaníček´s method. The comparison shows that the results provided by the two methods cannot be accepted as statistically consistent.Web of Science12213312

An innovative approach to accuracy of co-seismic surface displacement detection using satellite GNSS technology

This paper discusses a new method for determining co-seismic displacement using the Global Navigation Satellite System (GNSS) for the precise detection of positional changes at permanent stations after an earthquake. Positioning by the Precise Point Positioning (PPP) method is undertaken using data from the GNSS satellites and one designated station. A time series is processed by an anharmonic analysis before and after an earthquake and these one-day solutions increase the accuracy of measurements. The co-seismic static displacement can be precisely detected from the analysed time series before and after the earthquake, which can be used for the verification of seismic models. Reliability of the estimation of the size of the co-seismic offset is given by the mean square error (RMSE) of the shift. In this study, RMSE was determined by two approaches, initially from variances within PPP processing, and secondly when no positional change from the GNSS before or after the earthquake was assumed. The variance of the data in the time series gives a more realistic estimate of RMSE. This dual approach can affect seismological interpretation due to the need for the interpreting geophysicists to determine which case of co-seismic displacement is more probable for any given locality. The second approach has been shown to provide a more realistic co-seismic displacement accuracy in this study.Web of Science116art. no. 280

Optimizing the selection of shelf stacker for metallic warehouse

V práci je řešena realizace výběru regálového zakladače pro sklad hutního materiálu. Na základě vytvoření požadavků na systém byla provedena analýza trhu a došlo k oslovení vybraných firem. Z obdržených projektů byly vytvořeny hodnotící kritéria. Metodou vícekriteriálního rozhodování bylo pomocí hodnotících kritérií a vhodných algoritmů sestaveno pořadí projektů. V závěru práce jsou jednotlivé projekty vyhodnoceny a jsou popsány jejich klady a zápory pro uvažovaný sklad.The main subject of this thesis was to find a convenient shelf stacker for metallic warehouse. The companies were contacted after making analysis of market based on system requirements. The measure criterions were created according to results of received projects. By using the multicriteria analysis and suitable algorithm there was made the order of projects. At the end of the thesis there is an evaluation of all projects and their advantages and disadvantages for the particular store.Katedra technologie a řízení dopravyStudent obhájil diplomovou práci a zodpověděl otázky členů zkušební komise.Dokončená práce s úspěšnou obhajobo

Testing of GNSS multipath in different observational conditions at one stationary station

The aim of this paper is the analysis of temporal changes in multipath propagation errors on the pseudorange GNSS signal used for positioning, and its behavior during the calendar year (the quality of signal depends on e.g. foliage of trees, changes reflectivity surfaces due to rain or snow, etc.). The analysis was performed on data measured on a stationary point at Geodetic Observatory Pecny at Ondrejov, where one day was chosen as a constant time unit. Given the relatively highly unfavorable configuration of the experiment, RMS value of multipath is up to 60 cm on C1 and 40 cm on C2. These values vary with different weather conditions between 10 and 20 cm.Web of Science14442942

Ten Years of GPS Permanent Station at the Pecný Geodetic Observatory

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Aktivity VÚGTK v oblasti gravimetrie a GNSS na stanici Polom

343

S-JTSK/05 - otázky definice a tvorby systému

20121

The Repeated Absolute Gravity Measurements in the Czech Gravity Reference Network

10110

Databáze pro výpočty parametrů tíhového pole Země pro střední Evropu

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