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1
Stanowisko do pomiaru strzałki ugięcia konstrukcji mostowych z wykorzystaniem metod bezpośrednich i pośrednich
Bartnicki A.
Logistyka
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2011
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nr 6
PL
W referacie dokonano przeglądu wybranych metod monitorowania pracy konstrukcji mostowych w warunkach laboratoryjnych, na stanowiskach badawczych i w warunkach rzeczywistych, obiektów budowanych i eksploatowanych. Zaproponowano rozwiązanie konstrukcyjne stanowiska do testów zintegrowanego systemu monitorowania stałych i tymczasowych przepraw mostowych.
EN
This paper contains analysis of selected monitoring methods of bridge structure in laboratory conditions (on test stations) and in reality (on bridges being under construction and in use). Moreover, authors present their own construction of station for testing integrated monitoring system of permanent and temporary bridges.
2
Content available The transmission of GNSS data in the distart network for real kinematic positioning
Barbarella M., Bedin A., Gandolfi S.
Reports on Geodesy
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2006
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z. 2/77
241-247
EN
The GNSS RTK-Networks have been aroused a great interest for the advantages in the surveying of the territory in comparison to the traditional RTK methodology. The DISTART in the last year has improved a Network for RTK positioning. At present the net is composed by 8 permanent stations. The control centre is nearby the Department of DISTART of Bologna University. This network is fundamental to investigate all aspects concerning the networks for real time applications. Particularly, not only the topographic feature is investigated, but a very important aspect concerning the data transmission infrastructure is analyzed. In fact the first experimentations demonstrated that the performance of the topographic network depends on the guarantee of a correct data transmission from the GNSS permanent stations to the Control Centre. To investigate on this field we built a network composed by mixed physical data transmission infrastructure between control centre and the permanent stations on the territory (topographic baselines about 70-80 Km) using university Italian network (GARR) and commercial networks. We studied the time of latency of data transmitted, that is an important aspect of the network, because to solve ambiguities every software for real time network solution needs that the GNSS permanent station observations arrives with a latency not too much greater than a second. Parallely we studied other important aspects of the data transmission in the network like the NAPs (Network Access Protocols), the velocities, the data formats (RTCM 2.X, RTCM 3.0). In this work we want to give the direction to characterize a procedure step by step of a network installation, wit h the purpose to define a standard, possibly certified, about procedures, materials, softwares to use to install a network of GNSS permanent stations for RTK positioning.
3
Content available remote Precise orbit determination using a LEO-GPS satellite to satellite tracking approach
Caporali A., Dalla Torre A., Facchinetti C.
Reports on Geodesy
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2003
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z. 2/65
221-233
EN
The tracking requirements for a Low Earth Orbit (LEO) satellite are defined by the overall accuracy of the results each mission is designed for. Examples of satellites asking for Precise Orbit Determination are remote sensing satellite and geodetic satellites. The paper addresses some basic considerations for the design of a GPS data processing technique for the high-precision position determination of a GPS/GLONASS receiver. Once the position of the receiver is known, this information can be used to determine the orbit of Low Earth Orbit (LEO) satellites. The precision requirements to be fulfilled have to be compatible with the definition of Precise Orbit Determination (POD): in most of applications the accuracy for post processed data is required to be meter or even sub decimetre in the radial direction, particularly in those cases where a radar altimeter is on board typically for oceanographic applications, or for Intefferometric SAR. The use of GNSS receiver on board and the support of a ground station network with a set of appropriate postprocessing tools allows to fulfil also the more stringent requirements for the Precise Orbit Determination. Two are the major class of teehniques that have been historically used: the Geometric and the Dynamic approaches. Each of these concepts had advantages and disadvantages. The most important advantage of the geometric approach relies on its simplicity and that it has the potential to work in the presence of forces which were absent from the dynamic model. Now that the IGS products have become fairly standardised, and very precise predictions are going to be available in the next future with a very short delay time, and space 'ali in view receivers' are capable of tracking all the visible satellites, and possibly also the GLONASS satellites, the geometric solution has to be reconsidered. The technique chosen to perform these solutions is then the simple geometric point positioning approaeh using, for every epoch, pseudoranges measurements smoothed using phase data. The navigation satellite orbits are taken from the International GPS Service (IGS) products. To test the GPS POD sensor, the data provided by some in-orbit satellites with on board GPS receivers (es: CHAMP and SAC-C) can be used.
4
Content available remote GNSS monitoring of air pollution due to thin powder experimental results
Piemonte A., Anapoli K.
Reports on Geodesy
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2003
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z. 2/65
89-93
5
Content available remote Effects of the orbital uncertainties on atmosphere profiles retrieved with the GNSS radio occultation technique
Benedetto C., Gatti M., Vespe F.
Reports on Geodesy
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2003
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z. 2/65
203-211
EN
In the last decade the use of GPS radio occultation technique (GPS RO) bas been deeply and widely investigated for retrieving physical and chemical parameters of Earth atmosphere. The technique proved to be particularly precise in retrieving temperature profiles with an high vertical resolution (1 km) and accuracy (1st1K). The use of such technique for numerical weather prediction is the most challenging application. In fact a good knowledge of the orbits, in turn of the LEO satellite with the GPS receivers and the GPS satellites, is needed. Another severe requirement is that such orbits must be provided in Near-Real-Time (1 hour). Such severe requirement limits dramatically the precision of the estimated- predicted orbits. We will investigate in the present work the sensitiveness of the atmosphere profiles, namely pressure, temperature and humidity, to the LEO and GPS satellites orbital uncertainties. In the second part we will discuss about the requirements and specs to be fulfilled by the estimates of the orbits to assure a meteorological service based on the GNSS radio occultation technique.
6
Content available remote Real time GNSS in aviation
Andonov S.
Reports on Geodesy
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2002
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z. 3/63
75-85
7
Content available remote Real time GNSS application to air pollution monitoring
Piemonte A.
Reports on Geodesy
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2002
|
z. 3/63
111-116
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