Temat: GNSS/CORS - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Research and Development of Real-time High-precision GNSS Receivers: A Feasible Application for Surveying and Mapping in Vietnam
Autorzy:: Pham, Cong Khai
Nguyen, Gia Trong
Nguyen, Van Hai
Tran, Trong Xuan
Powiązania:: https://bibliotekanauki.pl/articles/2020209.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: GNSS/CORS
low-cost high-precision
GNSS receivers
real-time high-precision GNSS receivers
NTRIP
BD970 Trimble
ZED-F9P
GNSS
geodezja
Wietnam
Opis:: In recent years, the Global Navigation Satellite System (GNSS) has been widely applied in surveying and mapping. Currently, in Vietnam, dual-frequency GNSS receivers are quite extensively applied with the real-time kinematic (RTK) measurement technique using a continuously operating reference station network. However, high-accuracy GNSS receivers are often expensive, sometimes not meeting the needs of users for specific applications. This research develops two types of low-cost highprecision GNSS receivers for RTK positioning for different purposes. First, the millimeter precision GNSS receiver used in real-time displacement monitoring is based on Trimble's BD970 mainboard technology and some other modules. These components are interconnected according to a standard design scheme and assembled in an enclosure to form a GNSS receiver. In addition, a GNSS data transmission in the National Marine Electronics Association standard format by Networked Transport of Radio Technical Commission for Maritime Services via Internet Protocol (NTRIP) has been designed and developed. The GNSS receiver after development is loaded with program code written in the C# programming language, using the Arduino programming tool. Second, the GNSS receivers have the centimeter accuracy for RTK positioning used in surveying and mapping based on U-blox's mainboard technology and some other modules. These modules are also connected together according to a standard design scheme and assembled in an enclosure to form a complete GNSS receiver. The evaluation results show that the designed and developed GNSS receivers completely meet the requirements of surveying and mapping in coal mines in Vietnam, such as real-time monitoring of landslides, surveying and topographical mapping and other surveying works to serve the mining process.
Źródło:: Inżynieria Mineralna; 2021, 2; 391--404
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An assessment of seasonal variations in the cref cors at the University of Lagos
Autorzy:: Nwilo, Peter Chigozie
Ayodele, Emmanuel Gbenga
Okolie, Chukwuma John
Orji, Michael Joseph
Marve, Mnguhenen Funmilayo
Oyelade, Esther Abidemi
Daramola, Olagoke Emmanuel
Powiązania:: https://bibliotekanauki.pl/articles/100398.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:: GNSS
CORS
CREF
CSRS-PPP
seasonal variation
Opis:: Continuously Operating Reference Stations (CORS) are reference stations of the Global Navigation Satellite System (GNSS), providing fundamental positioning infrastructure that is accurate and reliable. As such, CORS are designed to meet the needs of a wide range of users requiring high three-dimensional (3D) positional accuracy. The Continuously Operating Reference Station at the Engineering Faculty (CREF), University of Lagos was set up in order to support research applications in Surveying, Mapping and Geodesy. This study evaluates the seasonal variations in the 3D coordinates of CREF using metrics such as coordinate differences, Standard Deviation (SD) and Standard Error (SE). The Canadian Spatial Reference System (CSRS), known as CSRS – Precise Point Positioning (CSRS-PPP) was used to compute the station’s daily coordinates over a three-year period from 2016 to 2018. In the analysis, the daily coordinates were divided into two seasons - the wet and the dry. The results obtained show that the dry and the wet seasons had SDs (5.4 mm, 3.9 mm, and 2.0 mm) and (5.2 mm, 18.6 mm and 14.4 mm) in the x, y and z-directions respectively. Generally, the dry season presents a better result than the wet season as revealed by the accuracy metrics. These results have led to an increased understanding of the seasonal variability inherent in the data acquired by GNSS CORS, and must be taken into consideration: in particular, for GNSS applications such as the weather prediction and water vapour estimation. This study concludes that more needs to be done regarding the maintenance of CREF to ensure data continuity and reliability for geodetic studies.
Źródło:: Geomatics, Landmanagement and Landscape; 2020, 1; 63-77
2300-1496
Pojawia się w:: Geomatics, Landmanagement and Landscape
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: General Geometric Model of GNSS Position Time Series for Crustal Deformation Studies – A Case Study of CORS Stations in Vietnam
Autorzy:: Tran, Dinh Trong
Nguyen, Quoc Long
Nguyen, Dinh Huy
Powiązania:: https://bibliotekanauki.pl/articles/2019404.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: geometric model
GNSS position time series
crustal deformation
CORS stations
Vietnam
model geometryczny
GNSS
Wietnam
Opis:: In processing of position time series of crustal deformation monitoring stations by continuous GNSS station, it is very important to determine the motion model to accurately determine the displacement velocity and other movements in the time series. This paper proposes (1) the general geometric model for analyzing GNSS position time series, including common phenomena such as linear trend, seasonal term, jumps, and post-seismic deformation; and (2) the approach for directly estimating time decay of postseismic deformations from GNSS position time series, which normally is determined based on seismic models or the physical process seismicity, etc. This model and approach are tested by synthetic position time series, of which the calculation results show that the estimated parameters are equal to the given parameters. In addition they were also used to process the real data which is GNSS position time series of 4 CORS stations in Vietnam, then the estimated velocity of these stations: DANA (n, e, u = -9.5, 31.5, 1.5 mm/year), HCMC (n, e, u = -9.5, 26.2, 1.9 mm/year), NADI (n, e, u = -10.6, 31.5, -13.4 mm/year), and NAVI (n, e, u = -13.9, 32.8, -1.1 mm/year) is similar to previous studies.
Źródło:: Inżynieria Mineralna; 2021, 2; 183--197
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Prospect of development of the VRSNET reference stations network
Autorzy:: Kudas, Dawid
Wnęk, Agnieszka
Savchyn, Ihor
Powiązania:: https://bibliotekanauki.pl/articles/100470.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:: VRSNET
active geodesic network design
RTK
GNSS
Voronoi/Thiessen polygons
CORS
projektowanie aktywnej sieci geodezyjnej
poligony Voronoi/Thiessen
Opis:: VRSNET jest komercyjną aktywną siecią geodezyjną składającą się ze stacji referencyjnych znajdujących się na terytorium Polski oraz na terytorium państw sąsiednich. W pracy przedstawiono analizę przestrzenną lokalizacji stacji permanentnych VRSNET, których anteny i odbiorniki satelitarne w sposób ciągły odbierają i rejestrują sygnały transmitowane przez GNSS (Global Navigation Satellite Systems). Rozważania skupiły się na delimitacji obszaru Polski pod względem potencjalnego zasięgu średniego poszczególnych stacji. W badaniach wykorzystano analizy przestrzenne m.in. diagram Voronoi/Thiessen (tesselacje Dirichleta) oraz bufory przestrzenne. W pracy oceniono geometrię sieci VRSNET dla potrzeb wykonywania pomiarów techniką Real Time Kinematic (RTK) z wykorzystaniem wektorów bazowych opartych wyłącznie na analizowanych stacjach. Podjęto także dyskusję dotyczącą możliwego rozwoju sieci VRSNET poprzez uruchomienie nowych stacji referencyjnych. W wyniku przeprowadzonych analiz przestrzennych wskazano lokalizację i zasięg obszarów wymagających zagęszczenia sieci VRSNET. W obszarach określonych w toku delimitacji powierzchni Polski wskazano lokalizacje 16 nowych stacji referencyjnych. W celu walidacji zagęszczoną o nowoprojektowane stacje sieć VRSNET poddano ponownej ocenie z użyciem diagramu Voronoi/Thiessena oraz buforów przestrzennych. Otrzymane wyniki porównano z parametrami dotyczącymi państwowej sieci ASG-EUPOS (Active Geodetic Network – European Position Determination System). Wykazano wynikającą z zaproponowanego scenariusza rozbudowy sieci VRSNET poprawę parametrów pomiarów techniką RTK. Zagęszczenie sieci może także wpływać pozytywnie na wyniki pomiarów techniką Network Real Time Kinematic (RTN).
The VRSNET is a commercial active geodetic network of reference stations deployed on Polish territory and in neighbouring countries. The paper presents a spatial analysis of locations of VRSNET permanent stations whose antennas and satellite receivers continuously record signals transmitted by Global Navigation Satellite Systems (GNSS). The study focused on delimiting the potential average range of individual stations in Poland. Spatial analyses, including Voronoi/Thiessen diagram (Dirichlet tessellations) and spatial buffers were used in the research. The study evaluated the geometry of the VRSNET network for the Real Time Kinematic (RTK) measurements that use base vectors solely from the analysed stations. Possible development of the VRSNET network through launching new reference stations was elaborated, too. The spatial analyses indicated the localisation and range of areas with an insufficient density of the VRSNET network. The locations of 16 new reference stations have been delimited on Polish territory. The VRSNET network with newly designed stations was reassessed for validation using the Voronoi/Thiessen diagram and spatial buffers. The results were compared with the parameters for the Active Geodetic Network – European Position Determination System (ASG-EUPOS). Improved RTK measurement geometric parameters resulting from the proposed scenario of the VRSNET network development have been demonstrated. Network density can also have a positive impact on the measurement results of the Network Real Time Kinematic (NRTK).
Źródło:: Geomatics, Landmanagement and Landscape; 2020, 2; 51-64
2300-1496
Pojawia się w:: Geomatics, Landmanagement and Landscape
Dostawca treści:: Biblioteka Nauki

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