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1
Content available Geodetic and geodynamic studies at Department of Geodesy and Geodetic Astronomy WUT
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.
Reports on Geodesy and Geoinformatics
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2016
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Vol. 100
165--200
EN
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.
2
Content available remote Koncepcja wykorzystania aktywnej sieci geodezyjnej ASGEUPOS w układzie sterowania i nawigacji latającej platformy bezzałogowej
Szpunar R., Rzucidło P.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 12a
154-158
PL
W pracy przedstawiono zagadnienia związane z techniką korekcji pomiarów GNSS w oparciu o AGS-EUPOS. Zaproponowano odpowiednie modyfikacje segmentu naziemnego oraz pokładowego systemu sterowania małym samolotem bezzałogowym, mające na celu wsparcie pomiarów pozycyjnych z aktywnej sieci geodezyjnej. Zastosowanie odbiornika GNSS jako podstawowego źródła informacji dla układu sterowania samolotem podczas podejścia do lądowania wiąże się z pewnymi problemami i ryzykiem. Istotnym czynnikiem jest np. ciągłość podawanej informacji, gdyż nawet kilkusekundowe zaniki sygnału mogą stwarzać zagrożenie dla statku powietrznego, szczególnie tuż przed przyziemieniem. Problem ten wraz z problemem opóźnień występujących w torze pomiarowym został poddany dyskusji w pracy. W końcowej części artykułu przedstawiono wpływ korekcji ASG-EUPOS na jakość automatycznego sterowania samolotem. Omówiono wyniki symulacji lotów samolotu bezzałogowego, wykonywanych na potrzeby skanowania terenu dla potrzeb fotogrametrycznych.
EN
In this paper some issues related to the GNSS measurements correction technique using the ASG-EUPOS network have been presented. Relevant modifications of the on-ground segment and on-board control system of a small unmanned aircraft have been proposed to receive position corrections from the ASG-EUPOS (Precise Satellite Positioning System in Poland). The use of a GNSS receiver as the basic source of information for the aircraft control system while approaching to land involves some problems and risks. A significant factor is e.g. the continuity of information supply because even a few seconds' signal fading may be risky for the aircraft especially just before the touchdown. This problem as well as the problem of signal delays have been discussed in the paper. In the final part of this paper the influence of ASG-EUPOS corrections on the quality of the aircraft autonomous control were presented. The results of UAV flight simulations made with the purpose of terrain scanning for photogrammetric mapping were discussed.
3
Content available remote Analiza pseudoodległości wyznaczonych laboratoryjnie z wykorzystaniem generatora sygnału GSG 54
Szpunar R., Drożdż M., Próchniewicz D.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 9a
230-234
PL
Testowanie odbiorników GNSS należy rozpatrywać jako szereg odpowiednio dobranych procedur, gdzie testy terenowe i laboratoryjne są rozpatrywane komplementarnie. Wiele z nich może być przeprowadzonych z wykorzystaniem specjalnych generatorów konstelacji satelitarnych systemów nawigacyjnych. Niniejszy artykuł przedstawia wynik testów laboratoryjnych odbiorników GNSS wykonanych z wykorzystaniem generatora konstelacji GSG-54 firmy Pendulum. Zaprezentowano procedurę analizy pseudoodległości pozyskanych w statycznym trybie pomiarowym.
EN
Testing of GNSS receivers should be considered as a set of complementary procedures which combines laboratory and real experiments. Most of these procedures can be carried out with the help of satellite signal generators. This article discusses results obtained when providing a few GNSS receivers with the satellite signal generated by the GSG-54 Pendulum signal generator. One of the proposed procedures, which analyses pseudoranges acquired during measurements in static scenario, is presented.
4
Content available remote GNSS receiver zero baseline test using GPS signal generator
Dróżdż M., Szpunar R.
Artificial Satellites : Journal of Planetary Geodesy
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2012
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Vol. 47, No. 1
13--22
EN
Validation of the performance of GPS receivers is crucial for many applications. This paper presents testing GPS receivers with the use of a GPS signal simulator. Unlike live testing, testing with simulators provides full control of simulated satellite signals and simulation environmental conditions. Moreover, generating repeatable signals makes possible to extend typical procedures. It allows to determine the absolute value of the position precision for each receiver without relation to any other one.
5
Content available Geodynamical investigations in the Pieniny Mountain in 1994-2010
Walo J., Pachuta A., Próchniewicz D., Szpunar R., Olszak T., Barlik M.
Reports on Geodesy
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2011
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z. 2/91
29-36
EN
Geodynamical investigation in the Pieniny Mountain (south of Poland) were carried out since the 1960s. They contained levelling, gravimetric measurements and distance observations in horizontal network. The results reveled vertical and horizontal movements of the crust and periodic changes in gravity. In 1994-1995 horizontal network was adapted to perform GPS observations and they were carried out with leveling, gravimetric and EDM observations. In 1990s, the Dunajec river dam and the water resorvoirs in Czorsztyn and Sromowce Wyżne have been built. This has a new aspect in investigations releted to the effect of tectonic movements on the dam. Taking that into account, the study was revived, after six year break, in 2001. The investigations, which contain GPS, gravimetric and leveling observations, have been carried out every year. In this paper the result of horizontal displacement obtained from GPS measurement as well as gravity changes in 1994-2010 period are presented and yields linear trend in north-east direction less than 1 mm/year.
6
Content available remote Kryteria doboru rur okładzinowych i wydobywczych jako funkcje wytrzymałości i wytężenia materiału oraz rodzaju i typu połączenia gwintowego - RURY HC „High Collapse”
Budak P., Szpunar R., Witek W.
Wiadomości Naftowe i Gazownicze
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2010
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R. 13, Nr 5 (145)
4-7
7
Content available Unified gravimetric reference frame for Polish IGS/EPN stations and geodynamic test fields
Walo J., Olszak T., Pachuta A., Próchniewicz D., Szpunar R.
Reports on Geodesy
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2010
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z. 1/88
105-113
8
Content available Utilization of the ASG - EUPOS system NAVGEO service in monitoring displacement
Próchniewicz D., Szpunar R., Walo J., Patucha A.
Reports on Geodesy
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2009
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z. 2/87
337-342
9
Content available Determining the mutual location of mobile objects using the ASG-EUPOSS system
Szpunar R., Próchniewicz D., Walo J.
Reports on Geodesy
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2009
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z. 2/87
391-396
10
Content available Recursive multipath effect mitigation in kinematic satellite observations
Szpunar R.
Reports on Geodesy
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2008
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z. 1/84
73-77
EN
The satellite kinematic observations are currently used in many precise point positioning applications. Unfortunately the multipath is the limiting error source for high precision measurcment. This is important problem in the real time GPS monitoring applications. The paper presents, recursive multipath effect mitigation in kinematic satellite observations, for one-day GPS observation series in geodetic control networks.
11
Content available Multipath effect analysis on selected points in control network "Wióry"
Szpunar R., Walo J., Próchniewicz D., Woźniak M.
Reports on Geodesy
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2008
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z. 1/84
87-92
EN
Geodetic networks are a basic constructions periodically measured on engineering constructions. They usually joint two objects: control objects and reference objects. Physical points and geodetic observations realize it. Moreover, the reference points and control points have to be checked for their stability and measuring technique (visibility between reference and control points for terrestrial observations, multipath effect for satellite obseryations). Multipath effect analysis on selected points in control network "Wióry" is presented in the paper.
12
Content available Application of the autoregression algorithm for moving objects' track prediction
Szafranek K., Szpunar R.
Reports on Geodesy
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2008
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z. 2/85
139-150
13
Content available Jednolity system grawimetrycznego odniesienia polskich stacji permanentnych GNSS i poligonów geodynamicznych - część dolnośląska
Olszak T., Pachuta A., Próchniewicz D., Szpunar R., Trojanowicz M., Walo J.
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum
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2008
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Vol. 7, nr 4
45-66
PL
W latach 2006–2007 założono na obszarze Polski sieć punktów bezwzględnych pomiarów grawimetrycznych stanowiącą system grawimetrycznego odniesienia polskich stacji permanentnych GNSS i poligonów geodynamicznych. Dolnośląska część tego systemu składa się z pięciu punktów położonych w miejscowościach: Wrocław, Kłodzko, Janowice Wielkie, Lubiąż i Świebodzice. W niniejszej pracy szczegółowo omówiono położenie punktów Wrocław, Kłodzko, Janowice i Lubiąż, sposób ich stabilizacji oraz wyniki pierwszych pomiarów zrealizowanych na tych punktach.
EN
In years 2006–2007, at the area of Poland there were established a network of the absolute gravity measurements points for definition gravity reference system of the Polish Permanent GNSS network and geodynamic networks. Lower Silesian part of the system consist of five points situated in places: Wroc"aw, K"odzko, Janowice Wielkie, Lubi#$ i &wiebodzice. The paper contain detailed description of location of the points Wroc"aw, K"odzko, Janowice and Lubi#$, methods of monumentation and first results of measurements made at the points.
14
Content available The feasibility of applying automatic target recognition in trigonometric levelling
Próchniewicz D., Szpunar R., Walo J., Pachuta A.
Reports on Geodesy
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2007
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z. 1/82
267-273
EN
The obtained results of the field experiments fully confirmed the feasibility of applying ATR systems in trigonometric levelling. In the tested span experiment at Józefosław, the value difference of height differences obtained with precise geometric levelling and the mean value of all measurements differed by a mere 2.7 mm, and for midnight measurements - it did not exceed 1 mm. The measurements made in the Pieniny Range were also successful in the case of observation compatibility and limiting the impact of atmospheric refraction on measurement results. Unfortunately, the comparison of the obtained height differences with those of 5 years ago showed considerable discrepancies stemming from benchmark subsiding rather than technological accuracy of trigonometric levelling. To verify this thesis it is planned to repeat trigonometric measurements on the testing ground in the Pieniny and to carry out control measurements by means of precise geometric levelling. Summing up, one can note that the use of tacheometers along with ATR enables to automate measurements and related quasi-continuous observations. These traits enable moreover: - to increase the number of observations, and what follows, increase accuracy and reliability of the zenithal length determined, - to average measurements made over a long period, which enables to undermine the influence of atmospheric refraction on the value of height difference measured, - to make observations in different atmospheric conditions, including nighttime when the atmosphere is stable, - to eliminate personal errors of the observer, - to analyze conducted observations in real time.
15
Content available Displacement monitoring of engineering objects using GPS-RTK technique
Szpunar R., Walo J.
Reports on Geodesy
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2007
|
z. 2/83
83-87
EN
Determination of the geometrical characteristic of engineering objects is necessary to thier safa exploitation. Modern terrestrial and satellite measuring techniques make possible the permanent monitoring of the objects. The techniques make also possible Poster presents a concepr how to take advantage of kinematics satellite GPS-RTK measurements and FIR filtres to determine of few millimetres displacement.
16
Content available Control network analysis of the dam "Wióry"
Walo J., Szpunar R., Woźniak M.
Reports on Geodesy
|
2007
|
z. 1/82
376-380
EN
The obtained results of the test measurements in the control network of the dam Wióry show that combined usage of length measurements and GPS observations enables to obtain high accuracy and reliability in defining point coordinates. The real determination accuracy of checkpoint displacements in this type of networks is at the level of (plus minus) 2-3mm. However, it should be added that in small networks covering an area up to 1 km in radius, classical measurements (most of all, length measurements) enable to obtain higher accuracies in determining point coordinates, obviously on condition that the net structure is well-designed and length measurement is possible. Having analyzed the obtained results, one can also formulate the following conclusions: - the assumed structure of a modified test network shows effective accuracy both for EDM measurements and GPS observations, - satellite measurements enable combined and direct observation of points between which there is no sight line. It is especially important in the case of reference points which are usually located around the monitored object, and it is rarely possible to link them by means of classical measurements; - GPS measurements make it possible to check the monitored network independently, at least limiting the incidence of major and systematic errors in processing the results and defining displacement values; so GPS observations may, in the case of small control networks, be treated as control measurements made periodically (e.g. every year); - accuracy assessment made for TDA5005 tachymeter observations even in the case of considerable target inclinations, made by means of standard reflectors, attested reflexive foil and CCR fulfills monitoring requirements of specific point (targets), enabling to obtain an accuracy of the (plus minus) 0.5 mm range in relation to reference points; - linear measurements in the test network of Wiory, made by means of a TDA5005 tachymeter and high precision reflectors can be accomplished within 2-3 days.
17
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
|
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.
18
Content available remote Analysis of the permanent GPS observations applied for tracking the periodical changes of engineering objects
Szpunar R., Walo J., Szelachowski W.
Reports on Geodesy
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2004
|
nr 2/69
329--334
EN
Tracking of the changes of geometry of engineering objects is an essential part of the control system of the object construction. Identification of the changes character, their duration and size allow us to select proper measuring instrumentation and technology. Applying permanent satellite observations as well as terrestrial methods make possible studying and modelling the object motion. The paper presents an analysis of the one day GPS observation series executed at the upper reservoir of the "Zarnowiec" water power station. The analysis is oriented at recognising the character of geometrical changes of the object.
19
Content available remote Satellite and gravimetric methods for monitoring changes in hydrotechnical earth built structures
Pachuta A., Barlik M., Olszak T., Szpunar R., Walo J.
Reports on Geodesy
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2003
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z. 4/67
7-14
20
Content available remote Movements of the control-points after filling the artificial water reservoir in Pieniny Mts.
Walo J., Pachuta A., Szpunar R., Olszak T.
Reports on Geodesy
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2003
|
z. 1/64
103-109
EN
Geodynamic Test-field in Pieniny Klippen Belt near to Czorsztyn was established in the seventies last century. Periodical geodetic and geophysical studies of the control network were executed yearly. After construction of the dam on Dunajec river and filling the artificial lake the measurements have been resumed in 2000-2001. Preliminary results displaying movements of the controInetwork stations resulting from precise leveling, GPS and EDM measurements are presented in the paper.
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