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Wyświetlanie 1-10 z 10
Tytuł:
Tropospheric delay in GNSS and meteorological ZTD and IPW data sources
Autorzy:
Kruczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/225151.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GNSS
sieci geodezyjne
meteorologia
geodetic networks
meteorology
Źródło:
Reports on Geodesy; 2008, z. 2/85; 125-137
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long series of GNSS Integrated Precipitable Water as a climate change indicator
Autorzy:
Kruczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/106733.pdf
Data publikacji:
2015
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
water vapour
GPS
IPW
IWV
tropospheric delay
climate change
climatological time series
para wodna
opóźnienia troposferyczne
zmiana klimatu
szereg czasowy
klimatologia
Opis:
This paper investigates information potential contained in tropospheric delay product for selected International GNSS Service (IGS) stations in climatologic research. Long time series of daily averaged Integrated Precipitable Water (IPW) can serve as climate indicator. The seasonal model of IPW change has been adjusted to the multi-year series (by the least square method). Author applied two modes: sinusoidal and composite (two or more oscillations). Even simple sinusoidal seasonal model (of daily IPW values series) clearly represents diversity of world climates. Residuals in periods from 10 up to 17 years are searched for some long-term IPW trend – self-evident climate change indicator. Results are ambiguous: for some stations or periods IPW trends are quite clear, the following years (or the other station) not visible. Method of fitting linear trend to IPW series does not influence considerably the value of linear trend. The results are mostly influenced by series length, completeness and data (e.g. meteorological) quality. The longer and more homogenous IPW series, the better chance to estimate the magnitude of climatologic IPW changes.
Źródło:
Reports on Geodesy and Geoinformatics; 2015, 99; 1-18
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated Precipitable Water Vapour measurements at Polish Polar Station Hornsund from GPS observations verified by aerological techniques
Autorzy:
Kruczyk, M.
Liwosz, T.
Powiązania:
https://bibliotekanauki.pl/articles/106765.pdf
Data publikacji:
2015
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
water vapour
GPS
IPW
IWV
tropospheric delay
radiosoundings
polar research
para wodna
opóźnienia troposferyczne
troposfera
badania polarne
Opis:
We present results of the comparison of integrated precipitable water measurements from GPS solution and aerological techniques: CIMEL-318 sun-photometer and radiosoundings (RAOB). Integrated Precipitable Water (IPW) - important meteorological parameter is derived from GPS tropospheric solutions by known procedure for GPS station at Polish Polar Station, Hornsund (Svalbard). The relation between 2 m temperature and the mean temperature of atmosphere above, used to convert from wet part of tropospheric delay (ZWD) to IPW, has been derived using local radiosonde data at Ny Alesund. Sunphotometer data have been provided by AERONET. Quality of dedicated tropospheric solutions has been verified by comparison with EPN tropospheric combined product. Several IPW comparisons and analyses lead to determination of systematic difference between techniques: GPS IPW and sunphotometer data (not present in case of RAOBs). IPW measured by CIMEL is on average 5% bigger (0.5 mm) than IPW from GPS. This bias changes seasonally and is a function of atmospheric temperature what signals some systematic deficiencies in solar photometry as IPW retrieval technique. CIMEL IPW show some temperature dependent bias also in relation to radiosoundings.
Źródło:
Reports on Geodesy and Geoinformatics; 2015, 98; 1-17
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tropospheric delay from EPN reprocessing by WUT LAC as valuable data source - in comparison to operational EPN products and aerological data
Autorzy:
Kruczyk, M.
Liwosz, T.
Powiązania:
https://bibliotekanauki.pl/articles/225806.pdf
Data publikacji:
2012
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
tropospheric delay
IPW
water vapour
sun photometer
opóźnienie w troposferze
para wodna
fotometr słoneczny
Opis:
Standard EPN tropospheric products still show some discrepancies, prominent especially before GPS week 1400. It was one of the motives of massive reprocessing projects organised in the frame of both IGS and EPN. WUT LAC is one of Analysis Centers actively participating in EPN Reprocessing Campaign. Both operational tropospheric products and reprocessing campaign were manifold analysed. Properties of information carried in ZTD estimates were investigated both in ZTD solutions and in the form of IPW (Integrated Precipitable Water). Independent aerological data sources - radiosounding and CIMEL-318 sunphotometer were used for external verification. Authors demonstrate some results convincingly demonstrating value of reprocessed tropospheric product. Tropospheric solutions from reprocessing compared to meteorological data demonstrate better conformity. Most important application of long series ZTD’s of uniform quality is climatology. Search for climate change signal in IPW series is possible only with a reliable tropospheric solution. Reprocessing campaign results meet this requirement.
Źródło:
Reports on Geodesy; 2012, z. 1/92; 109-122
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated precipitable water from GPS observations and CIMEL sunphotometer measurements at CGO Belsk
Autorzy:
Kruczyk, M.
Liwosz, T.
Pietruczuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/106713.pdf
Data publikacji:
2017
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
water vapour
GPS
IPW
tropospheric delay
sunphotometer
para wodna
opóźnienia troposferyczne
fotometr słońca
Opis:
This paper describes results of integrated precipitable water co-located measurements from two techniques: GPS solution and CIMEL-318 sun-photometer. Integrated Precipitable Water (IPW) is an important meteorological parameter and is derived from GPS tropospheric solutions for GPS station at Central Geophysical Observatory (CGO), Polish Academy of Sciences (PAS), Belsk and compared with sunphotometer (CIMEL-318 device by Cimel Electronique) data provided by Aerosol Robotic Network (AERONET). Two dedicated and independent GPS solutions: network solution in the sub-network of European Permanent Network (EPN) and precise point positioning solution have been made to obtain tropospheric delays. The quality of dedicated tropospheric solutions has been verified by comparison with EPN tropospheric combined product. Several IPW comparisons and analyses revealed systematic difference between techniques (difference RMS is over 1 mm). IPW bias changes with season: annual close to 1 mm IPW (and semi-annual term also present). IPW bias is a function of atmospheric temperature. Probable cause of this systematic deficiency in solar photometry as IPW retrieval technique is a change of optical filter characteristics in CIMEL.
Źródło:
Reports on Geodesy and Geoinformatics; 2017, 103; 46-65
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic system for GPS tropospheric delay estimation, on-line GPS processing user service and analysis of the results
Autorzy:
Kruczyk, M.
Liwosz, T.
Rogowski, J. B.
Powiązania:
https://bibliotekanauki.pl/articles/224483.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
system pozycjonowania obiektów
GPS
geodezja satelitarna
troposfera
Global Positioning System
satellite geodesy
tropospheric delay
Opis:
This paper describes automatic system for GPS tropospheric delay estimation developed at the Institute of Geodesy and Geodetic Astronomy of the Warsaw University (WUT) LAC. The system is based on BPE (Bernese Processing Engine) and utilizes UltraRapid orbits and EUREF weekly coordinates. We describe processing strategies used in this application and report various experiences leading to start of NRT tropospheric service. We have made many statistical quality analysis of the resulting solutions. Accurate comparisons with ZTD combined product (EPN and IGS) and radiosounding data has been made. The poster presents also other research areas on the GPS data processing performed especially the Internet based service for an on-line GPS processing of the users data. Finally we present some other ideas of our interest how to use tropospheric delay in meteorology and climatology.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 139-151
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current activities of the astro-geodetic observatory in Jozefosław
Autorzy:
Rogowski, J.
Bogusz, J.
Figurski, M.
Liwosz, T.
Kruczyk,, M.
Kujawa, L.
Kłęk, M.
Powiązania:
https://bibliotekanauki.pl/articles/224776.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geodezja
geodezja satelitarna
obserwatorium
geodesy
satellite geodesy
observatory
Źródło:
Reports on Geodesy; 2006, z. 2/77; 39-46
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activities of Józefosław Astro-Geodetic Observatory in the last five decades
Autorzy:
Rogowski, J.B.
Barlik, M.
Litwosz, T.
Kruczyk, M.
Kujawa, L.
Rajner, M.
Olszak, T.
Kurka, W.
Powiązania:
https://bibliotekanauki.pl/articles/225082.pdf
Data publikacji:
2010
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
Obserwatorium Astronomiczno–Geodezyjne w Józefosław
historia
Astronomical-Geodetic Observatory in Józefosław
history
Opis:
Astro-Geodetic Observatory in Józefosław, witch belongs to the Departament of Geodesy and Geodetic Astronomy of the Warsaw University of Technology, started to permanent observations in 1958. First of them was time service started in February 1958, coordinated by BIH. From 1959 astrometrial latitude measurements have been done with aim to determine the parameters of the Earth rotation. In 1991 the Observatory was joned to the International GPS Service for Geodynamics (IGS) and started to operate as a permanent one in 1993. There have been performed many observations and scientific researches, such as: GPS in the frame of IGS/IGLOS/EUREF; tidal observations; absolute gravity measurements; changes of the vertical, based on the gravimetric measurements; astrometric observations and metrology. Moreover studies on RTK and DGPS measurements using mobile phone for data transmision are performed since 1998. WUT EUREF Lokal Analysis Centre, one of the 17 Lokal Analysis Centres acting in Europe, is a very important part of the Observatory. The Centre makes continuous service of one-week and daily aolution in the farme of EPN network, processes national and international GPS campaigns (CEGRN, EXTENDED SAGET etc.), models ionosphere and troposphere parameters, compute tidal components and changes of the vertical according to astrometric and gravimetric measurenents. This paper present history and current state of the art of the Observatory's activites.
Źródło:
Reports on Geodesy; 2010, z. 2/89; 31-52
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geodetic and geodynamic studies at Department of Geodesy and Geodetic Astronomy WUT
Autorzy:
Brzeziński, A.
Barlik, M.
Andrasik, E.
Izdebski, W.
Kruczyk, M.
Liwosz, T.
Olszak, T.
Pachuta, A.
Pieniak, M.
Próchniewicz, D.
Rajner, M.
Szpunar, R.
Tercjak, M.
Walo, J.
Powiązania:
https://bibliotekanauki.pl/articles/106807.pdf
Data publikacji:
2016
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
physical geodesy
satellite measurement techniques
GNSS meteorology
geodynamic studies
geodezja fizyczna
technika pomiarów satelitarnych
meteorologia GNSS
badania geodynamiczne
Opis:
The article presents current issues and research work conducted in the Department of Geodesy and Geodetic Astronomy at the Faculty of Geodesy and Cartography at Warsaw University of Technology. It contains the most important directions of research in the fields of physical geodesy, satellite measurement techniques, GNSS meteorology, geodynamic studies, electronic measurement techniques and terrain information systems.
Źródło:
Reports on Geodesy and Geoinformatics; 2016, 100; 165-200
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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