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Wyświetlanie 1-15 z 17
Tytuł:
Differences in mathematical models of GPS and pseudolite observation equations
Autorzy:
Rzepecka, Z.
Wasilewski, A.
Cellmer, Sł.
Rapiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/225048.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
satelita GPS
pseudosatelita
system pozycjonowania obiektów
pomiary geodezyjne
GPS satellite
pseudo-satellite
Global Positioning System
engineering surveying
Opis:
Some error sources in GPS surveys, such as linearization error and orbital bias, are well known and do not require further investigation. The impact of these errors in GPS + pseudolite observations can be different and must be considered separately. This paper presents influence of orbital bias and linearization error on single differenced pseudolite observations.
Źródło:
Reports on Geodesy; 2007, z. 1/82; 295-301
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ASI activities in CEGROP II framework: Discussion of the results
Autorzy:
Vespe, F.
Garramone, L.
Marzo, C.
Rutigliano, P.
Pacione, R.
Powiązania:
https://bibliotekanauki.pl/articles/224452.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
osuwiska
GPS
system pozycjonowania obiektów
CERGOP
landslides
Global Positioning System
Opis:
ASI/CGS contribution to CERGOP II project covered the following topics: landslide monitoring, production and quality check of zenith total delays estimated for a global as well as regional GPS networks devoted to meteorology applications, RTK and navigation tests, critical analysis of GPS long time series helpful for geodynamic as well atmospheric investigations. For what concern the landslides monitoring the two sites under investigation: Aliano and Avigliano are located in Basilicata region, (South of Italy). These sites are affected by a dramatic creep of the ground which in the past was the cause of severe damages to the buildings and roads in the areas. We will show the state of art of the activities comparing GPS with Perrnanent Scatter IN-SAR technique For what concern the routine production of ZTD we will show a critical comparisons of our solutions with radio balloon observations and a discussion about the assessment of their reliability. Finally the results of a navigation experiment by using differential correction provided by EUREF-NTRIP service will be shown.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 201-215
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elaboration of geodetic control network at construction of bridge over Vistula River in Pulawy
Autorzy:
Rzepecka, Z.
Wasilewski, A.
Cellmer, Sł.
Rapiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/225050.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
satelita GPS
system pozycjonowania obiektów
most
Puławy
Wisła
pomiary geodezyjne
GPS satellite
Global Positioning System
bridge
Pulawy
Vistula river
engineering surveying
Opis:
In this paper the method of geodetic control network elaboration is presented. That network consists of GPS vectors and distances measured classically. The method of reduction of GPS vectors from WGS84 to local coordinate system was described. Common adjustment of GPS vectors and distances in a local coordinate system was performed. The observations set was obtained from measurements of geodetic control network at the construction site of bridge over Vistula River in Pulawy.
Źródło:
Reports on Geodesy; 2007, z. 1/82; 305-308
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of short-terms height changes of the Hans Glacier using quasi-continuous GPS observations
Autorzy:
Walo, J.
Adamek, A.
Puczko, D.
Powiązania:
https://bibliotekanauki.pl/articles/225003.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
satelita GPS
system pozycjonowania obiektów
lodowiec Hans
wysokośc lodowca
pomiary geodezyjne
GPS satellite
Global Positioning System
Hans Glacier
glacier height
engineering surveying
Opis:
The analysis of the measurement results exemplifies very valuable information about the glacier behavior which glaciologists need to understand phenomena occurring on the glacier in different seasons. Beside the experiences collected during this experiment it will be the background to design similar investigations from survey technology and methodology point of view. Basing on these results and experiment analysis we can draw some conclusions: - In the period of the experiment the glacier surface felt down as much as 2 meters. This is the natural tendency and consequences of flowing down the glacier to the fiord and his ablation. - In the figures we could notice wavy nature of the phenomenon of the glacier surface which probably is connected with topography of the fiord bottom, ocean tides affected on the glacier front and some processes connected with the ablation water delivery to the glacier bed. This problem requires a detailed study based on environmental data. - The results of determined heights were periodically disrupted by atmospheric conditions (snowing, wind). - The GPS data used to follow the vertical velocity of the glacier surface let us to monitor the glacier with height accuracy. Also the automation of the survey and post-processing is possible. - There are some disadvantages of using this monitoring technology in surveys: one point of observations, influence of atmospheric conditions on the results of surveys, periodically hard access to equipment and not good enough way of installation of the satellite antenna on the glacier (ablation pole).
Źródło:
Reports on Geodesy; 2007, z. 1/82; 367-373
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of Precise Point Positioning (PPP) accuracy using online services
Autorzy:
Malinowski, M.
Kwiecień, J.
Powiązania:
https://bibliotekanauki.pl/articles/106719.pdf
Data publikacji:
2016
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
Precise Point Positioning
PPP
GPS
APPS
CSRS-PPP
GAPS
magicGNSS
System Precyzyjnego Pozycjonowania
Opis:
Precise Point Positioning (PPP) is a technique used to determine the position of receiver antenna without communication with the reference station. It may be an alternative solution to differential measurements, where maintaining a connection with a single RTK station or a regional network of reference stations RTN is necessary. This situation is especially common in areas with poorly developed infrastructure of ground stations. A lot of research conducted so far on the use of the PPP technique has been concerned about the development of entire day observation sessions. However, this paper presents the results of a comparative analysis of accuracy of absolute determination of position from observations which last between 1 to 7 hours with the use of four permanent services which execute calculations with PPP technique such as: Automatic Precise Positioning Service (APPS), Canadian Spatial Reference System Precise Point Positioning (CSRS-PPP), GNSS Analysis and Positioning Software (GAPS) and magicPPP - Precise Point Positioning Solution (magicGNSS). On the basis of acquired results of measurements, it can be concluded that at least two-hour long measurements allow acquiring an absolute position with an accuracy of 2-4 cm. An evaluation of the impact on the accuracy of simultaneous positioning of three points test network on the change of the horizontal distance and the relative height difference between measured triangle vertices was also conducted. Distances and relative height differences between points of the triangular test network measured with a laser station Leica TDRA6000 were adopted as references. The analyses of results show that at least two hours long measurement sessions can be used to determine the horizontal distance or the difference in height with an accuracy of 1-2 cm. Rapid products employed in calculations conducted with PPP technique reached the accuracy of determining coordinates on a close level as in elaborations which employ Final products.
Źródło:
Reports on Geodesy and Geoinformatics; 2016, 102; 15-31
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experiences of RTK positioning in hard observational conditions during Nysa Kłodzka river project
Autorzy:
Bakuła, M.
Oszczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/224504.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
RTK
pozycjonowanie satelitarne
geodezja satelitarna
GPS
system pozycjonowania obiektów
satellite positioning
satellite geodesy
Opis:
The paper presents the application of RTK technology for measuring the horizontal and vertical cross-sections of the Nysa Kłodzka River located in the southern part of Poland. GPS measurements were performed by the staff of Chair of Satellite Geodesy and Navigation of University of Warmia and Mazury in Olsztyn in cooperation with the team of the OPeGieKa Wroclaw company. The measurements had been done for 30 days during August and September 2004. Three GPS receivers were used such as two Ashtech Z-Xtreme and one Ashtech Z-Surveyor. The radiomodems Satelline of SATEL company were used for transmitting RTK corrections from a reference station to rovers. RTK measurements were being performed in very difticult observational conditions Iike in heavy shrubbery or under trees. It was excellent occasion to test reliability and accuracy of RTK positioning in practice. In general, the use of RTK technology in woodlands and rural terrain extremely improved efficiency of works, but gross errors were being occurred from time to time in very severe conditions of GPS observations due to the lack of good satellite geometry and availability.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 71-79
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The geometrical factors of a navigational systems
Autorzy:
Banachowicz, A.
Banachowicz, G.
Wolski, A.
Powiązania:
https://bibliotekanauki.pl/articles/224416.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
systemy nawigacyjne
pozycjonowanie satelitarne
GPS
system pozycjonowania obiektów
DGPS
nawigajca morska
navigational systems
satellite positioning
Global Positioning System
maritime navigation
Opis:
Vessels engaged in coastal navigation must have their position determined with high accuracy. This can be ensured only by satellite systems such as GPS and GLONASS. The paper presents generalized concepts of geometrical factors of a navigational system. Such factors are used in the analysis of the accuracy of various radionavigational systems aimed at selecting the best system for a given area. The modern process of navigation is described in a four-dimensional space - three geometric dimensions and time. For this reason both the description and analysis of navigational systems should be performed in the same space. The traditional geometric factor of the land-based radionavigational system was generalised to include the factors GDOP, PDOP, HDOP, VDOP and TDOP for the needs of the accuracy analysis of a GPS system. These terms are related to the so-called geometry of navigational system - through mutually related positions of gradients of navigational functions determining position Iines (hyperplanes). They are connected with non-Iinear regression through a probabilistic relation between the measured navigational parameters. Consequently, the concept of geometric factors in the process of navigational parameters estimation can be also extended to include a larger number of dimensions appropriate for the state vector.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 261-267
0867-3179
Pojawia się w:
Reports on Geodesy
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:
Comparison of pseudolite observations and EDM survey influence on GPS vector estimation
Autorzy:
Rapiński, J.
Zapert, M.
Powiązania:
https://bibliotekanauki.pl/articles/225060.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
system pozycjonowania obiektów
EDM
pomiary geodezyjne
electronic distance meter
GPS
Global Positioning System
engineering surveying
Źródło:
Reports on Geodesy; 2007, z. 1/82; 287-293
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial evaluation of usefulness of geodetic coordinates obtained with the use of RTK-GPS corrections generated by Malopolski Satellite Positioning System
Autorzy:
Siejka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/225052.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
satelita GPS
system pozycjonowania obiektów
RTK GPS
pomiary GPS-RTK
Małopolski System Pozycjonowania Satelitarnego
technika RTK
pomiary geodezyjne
GPS satellite
Global Positioning System
real-time measurements
real time kinematic
Małopolski Satellite Positionning System
engineering surveying
Opis:
The paper presents attempt to find the answer to the question, if the experimentally functioning in Matopolska and Silesia system of reference stations is useful to determine geodetic coordinates, using real time technology when the final result of the measurement is known immediately. To obtain the aim multiple measurements were performed using the RTK-GPS technology on selected points of the POLFER network using corrections generated by the System. On a basis of empirical results of measurements, the evaluation of the usefulness of the system for geodetic applications was performed. Reference stations network of the system ASG-PL which was tested, is one of the so called terrestrial differential systems aiding measurements GPS-RTK (real time kinematic). Networks of the type are very often build in different countries and have national or even continental character.
Źródło:
Reports on Geodesy; 2007, z. 1/82; 309-315
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local geodynamic network in the Pieniny Klippen Belt. Results of seven GPS measurement epochs
Autorzy:
Walo, J.
Czarnecki, K.
Olszak, T.
Pachuta, A.
Szpunar, R.
Powiązania:
https://bibliotekanauki.pl/articles/224450.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
Pieniny
badania geodynamiczne
geodynamika
GPS
system pozycjonowania obiektów
Pieniny Klippen Belt
geodynamic investigations
geodynamics
Global Positioning System
Opis:
The results or seven GPS observational campaigns have demonstrated mutual approaching trend or the Magura Nappe and the Podhale Flysh. Such a trend was disturbed during the period or 1995-2001 when the dam on the Dunajec-river was constructed and artificial lake was created. A hypothesis saying that the filling or the lake resulted in temporarily driving apart the Magura Nappe and Podhale Flysh has been presumed. After 2001 the tectonic structures "started to approach each other". The control points within the Iimits or the Pieniny Klippen Belt have demonstrated oscillatory changes or coordinates in the range of ±15 mm. The results or the last observation epoch show a disturbance or above mentioned trend. It would be due to earthquake in November 2004 that happened near the test field. This hypothesis should be verified next years by the following observational campaigns.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 169-172
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Earth crust surface movements in SW Poland from GPS and leveling data
Autorzy:
Bosy, J.
Kontny, B.
Cacon, S.
Powiązania:
https://bibliotekanauki.pl/articles/224401.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
global positioning system
geodezja satelitarna
sieć geodezyjna
niwelacja
system pozycjonowania obiektów
satellite geodesy
geodetic network
levelling
Opis:
Permanent and periodic satellite GPS observations in SW Poland are realized since 1996. The results of these observations are used for the earth crust surface movements determination. Values of the movement velocities are significant for horizontal as well as vertical components. The vertical movements determined by GPS were compared with the vertical movements obtained by repeated leveling measurements, performed in the 50'ties, 70'ties and 90'ties of the 20th Century. The calculated movements are discussed in relation to tectonics in the paper.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 301-311
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local improvement of the transformation parameters of coordinates
Autorzy:
Savchuk, S.
Tymoshenko, O.
Powiązania:
https://bibliotekanauki.pl/articles/224446.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
współrzędne
parametry przekształceń
przekształcenie współrzędnych
GPS
system pozycjonowania obiektów
coordinates
transformation parameters
coordinate transformation
Global Positioning System
Źródło:
Reports on Geodesy; 2006, z. 1/76; 227-231
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodical fundamentals of creation of permanent GPS networks
Autorzy:
Uchytel, I. L.
Jaroshenko, V. N.
Kapochkin, B. B.
Powiązania:
https://bibliotekanauki.pl/articles/224403.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
systemy nawigacyjne
geodezja satelitarna
nawigacja satelitarna
GPS
system pozycjonowania obiektów
pozycjonowanie satelitarne
sieć geodezyjna
navigational systems
satellite geodesy
satellite navigation
Global Positioning System
satellite positioning
geodetic network
Źródło:
Reports on Geodesy; 2006, z. 1/76; 293-300
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geodesy, tectonics and geodynamics of Dinnarides
Autorzy:
Medak, D.
Pribicevic, B.
Prelogovic, E.
Powiązania:
https://bibliotekanauki.pl/articles/224512.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geodynamika
tektonika
pozycjonowanie satelitarne
GPS
system pozycjonowania obiektów
pomiary geodezyjne
CEGRN
Chorwacja
geodynamics
tectonics
satellite positioning
geodetic measurements
Croatia
Opis:
This paper summarises recent aetivities on merging the geodetic, geologic and neotectonic evidence of geodynamics in Croatian part of Dinnarides. The area of the City of Zagreb, which is the boundary zone of Eastern Alps, Dinnarides and Pannonian Basin is incIuded as well. It is shown here that the evidence for fractures of Eastern Adriatic differs from the previous hypotheses. This concIusion is derived from the results of various geodetic measurements: satellite positioning (GPS), astro-geodetic measurements of detlections of the vertical. These results are combined with geologic measurements and results of seismic activity studies in order to give more detailed and more accurate picture of the current situation in the tectonically very active region of Dinnarides. Several GPS-campaigns performed in the City of Zagreb area are examined as well. Due to the proximity of Croatian capitol, special attention has been paid to the effects of possible hazard on construction code.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 85-90
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
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