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1
Content available Initial evaluation of usefulness of geodetic coordinates obtained with the use of RTK-GPS corrections generated by Malopolski Satellite Positioning System
Siejka Z.
Reports on Geodesy
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2007
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z. 1/82
309-315
EN
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.
2
Content available Elaboration of geodetic control network at construction of bridge over Vistula River in Pulawy
Rzepecka Z., Wasilewski A., Cellmer Sł., Rapiński J.
Reports on Geodesy
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2007
|
z. 1/82
305-308
EN
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.
3
Content available Differences in mathematical models of GPS and pseudolite observation equations
Rzepecka Z., Wasilewski A., Cellmer Sł., Rapiński J.
Reports on Geodesy
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2007
|
z. 1/82
295-301
EN
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.
4
Content available Comparison of pseudolite observations and EDM survey influence on GPS vector estimation
Rapiński J., Zapert M.
Reports on Geodesy
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2007
|
z. 1/82
287-293
5
Content available Analysis of short-terms height changes of the Hans Glacier using quasi-continuous GPS observations
Walo J., Adamek A., Puczko D.
Reports on Geodesy
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2007
|
z. 1/82
367-373
EN
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).
6
Content available The geometrical factors of a navigational systems
Banachowicz A., Banachowicz G., Wolski A.
Reports on Geodesy
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2006
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z. 1/76
261-267
EN
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.
7
Content available The Earth crust surface movements in SW Poland from GPS and leveling data
Bosy J., Kontny B., Cacon S.
Reports on Geodesy
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2006
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z. 1/76
301-311
EN
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.
8
Content available The accuracy of the DGPS system after annulment of selective availability (S/A)
Bober R., Szewczuk T., Wolski A.
Reports on Geodesy
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2006
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z. 1/76
269-273
EN
This articIe presents the results of an assessment of position determination accuracy of a DGPS system. Correction signals were transmitted from Dzwinow and Hammerodde reference stations. The research, incIuding six locations in the vicinity of Zalew Szczecinski (Lake Szczecin), aimed at the determination of how the elimination of selective availability affects position accuracy in a DGPS system.
9
Content available Methodical fundamentals of creation of permanent GPS networks
Uchytel I. L., Jaroshenko V. N., Kapochkin B. B.
Reports on Geodesy
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2006
|
z. 1/76
293-300
10
Content available Local improvement of the transformation parameters of coordinates
Savchuk S., Tymoshenko O.
Reports on Geodesy
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2006
|
z. 1/76
227-231
11
Content available Local geodynamic network in the Pieniny Klippen Belt. Results of seven GPS measurement epochs
Walo J., Czarnecki K., Olszak T., Pachuta A., Szpunar R.
Reports on Geodesy
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2006
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z. 1/76
169-172
EN
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.
12
Content available GPS antenna calibration at the Geodetic Observatory Pecny, Czech Republic
Filler V., Kostelecky J.
Reports on Geodesy
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2006
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z. 1/76
233-244
13
Content available Geodesy, tectonics and geodynamics of Dinnarides
Medak D., Pribicevic B., Prelogovic E.
Reports on Geodesy
|
2006
|
z. 1/76
85-90
EN
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.
14
Content available Five years of EUREF-permanent GPS-stations in Croatia
Medak D., Pribicevic B., Dapo A., Medved I.
Reports on Geodesy
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2006
|
z. 1/76
91-97
EN
In October 2000, the Faculty of Geodesy, University of Zagreb, with the support o German Federal Agency for Cartography and Geodesy (BKG) and Croatian State Geodetic Administration, established two permanent GPS-stations: one in Dubrovnik and another one in Osijek. The stations became the part of large global network International GPS Service for Geodynamics (IGS), ie. the part of EUREF/Permanent project. This paper describes the background for the choice of locations, stabilization and precise measurements of local GPS-networks that connected the stations with EUREF/CROREF points nearby. The problems in the maintenance of the stations have been described as welI. A view on the perspective of permanent GPS-services in Croatia is given, too.
15
Content available Final Report on research activities within the project CERGOP2/Environment in Croatia
Medak D., Pribicevic B., Prelogovic E., Dapo A., Medved I.
Reports on Geodesy
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2006
|
z. 1/76
81-84
EN
Researchers from the Faculty of Geodesy, University of Zagreb, organized and performed various research activities within the project CERGOP2/Environment. The participation in both CEGRN campaigns was ensured with two epoch stations: Brusnik and Hvar. Activities related to the working package 10.4: International geodynamic test area Plitvice Lakes included several hydrographic measurements with the combination of GPS positioning and echosounder bathymetry. Repeated measurements with two frequencies yielded new insight about the sediments on the lake bottom. A structural map of the Lakes has been prepared, too. Geodynamic measurements has been performed on several special points. The foundation for future permanent station in the area of the Plitvice Lakes has been prepared.
16
Content available Experiences of RTK positioning in hard observational conditions during Nysa Kłodzka river project
Bakuła M., Oszczak S.
Reports on Geodesy
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2006
|
z. 1/76
71-79
EN
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.
17
Content available CERGOP-2 Project activities of Bulgaria
Milev G., Vassileva K., Becker M.
Reports on Geodesy
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2006
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z. 1/76
111-118
EN
This paper summarizes the recent works with respect to the CERGOP-2 project tasks. The main activity was the implementation of the Working Package "Geodynamics of Balkan Peninsula". Major efforts were taken to the maintenance of the operation of two permanent GPS stations in Bulgaria and to arrange for the data transmission to the CERGOP Data Centre in Graz. The CEGRN GPS campaigns of 2003 and 2005 were analyzed together with additional Balkan Peninsula stations. New results on coordinates and velocities for this Balkan Peninsula subnet of CEGRN are computed and will be presented and discussed. The accomplished works on the monograph "Geodynamics of Balkan Peninsula" with the preparation of the manuscripts and the main content of the findings will be outlined.
18
Content available Automatic system for GPS tropospheric delay estimation, on-line GPS processing user service and analysis of the results
Kruczyk M., Liwosz T., Rogowski J. B.
Reports on Geodesy
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2006
|
z. 1/76
139-151
EN
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.
19
Content available ASI activities in CEGROP II framework: Discussion of the results
Vespe F., Garramone L., Marzo C., Rutigliano P., Pacione R.
Reports on Geodesy
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2006
|
z. 1/76
201-215
EN
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.
20
Content available Annual Report CEGROP-2/Environment WP2. Station qality assessment and upgrade. Period: April 2005 - March 2006
Virag G.
Reports on Geodesy
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2006
|
z. 1/76
65-70
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