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1
Content available The adaptation modelling of a GPS signal by means of neural networks
Gil J.
Reports on Geodesy
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2006
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z. 2/77
307-314
EN
Geodetic monitoring carried out in a number of cases in order to determine the dynamics of a particular phenomenon requires, apart from suitable measurement instruments, also suitable methods of processing the results of experimental data. While formulating a particular technical problem in the form of an objective function it is possible to obtain its solution by applying an optimising neural network. One of the possible uses of this kind of network is its application in adaptation modeling. The article presents two aspects of modeling: interfering noise elimination and identifying an object in the form of measurement results of dynamic GPS signals (Szpunar et al., 2003) carried out in real time. A computer simulation of the problem has been implemented by the author himself.
2
Content available Metric and qualitative evaluation of quickbird orthoimages for a large scale geodatabase creation
Barbarella M., Zanni M.
Reports on Geodesy
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2006
|
z. 2/77
255-262
3
Content available Kinematic GPS batch processing, improving ambiguity fixing performances
Roggero M.
Reports on Geodesy
|
2006
|
z. 2/77
227-234
EN
In kinematic observation processing the equivalence between the state space approach (Kalman filtering plus smmothing) and the last squares approach including dynamic has been shown (Albertellat al. 2006). we have specialized the proposed batch solution (least squares including dynamic), considering the case of discrete-time linear systems with constant biases, applying the algorithm to estimate the float ambiguities and their variance-covariance matrix in GPS observations (Roggero, 2006). The improvements in ambiguity fixing performances will be shown, through the ADOP, the dimension of the search space and the success rate.
4
Content available Kinematic GPS batch processing, a constrained solution applied to antenna array
Roggero M., Roggero M.
Reports on Geodesy
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2006
|
z. 2/77
235-240
EN
Kinematic GPS observation processing requires robustness, especially in noisy environments. Ambiguity resolution robustness can be improved with multi base approach and parameters constraining. We consider a discrete-time linear systems with known dynamics, produced by a GPS antenna array mounted on a vehicle. Simulated and real data examples are given, where both system dynamics and geometric constraints strengthen ambiguities fixing. The developed algorithm works in a multi-base approach with the simplifying hypothesis of short baselines.
5
Content available Geokinematics of Central Europe from GPS data
Caporali A., Śledziński J.
Reports on Geodesy
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2006
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z. 2/77
17-28
EN
In several seismic or potentially seismic areas deformation processes at moderate depth generate deformation at the surface and measurement of such surface deformation is an important boundary condition to models of the evolution of interacting blocks before, during and after earthquakes. the network of some 160 permanent GPS stations disseminated in Europe under the European Permanent Network of EUREF and the CERGOP 2 Project of the European Union, with additional local densification stations, provides a valuable contribution to the estimate of the average surface strain rate. The expected strain rate is of the order of 20-40 nanostrian per year, corresponding to a velocity change of a few mm/year over distances of some hundreds of km. Consequently, we require accuracies in the velocities of fractions of mm/year and full control of systematic errors which may mask tectonic signals. Based on our systematic processing of GPS data from permanent European GPS stations covering nearly a decade (1995-2005) we present the large scale velocity flow across most of continental Europe and the associated horizontal gradient or strain rate field.
6
Content available First test and application of GPS permanent station installed by Pisa University
Caroti G., Piemonte A.
Reports on Geodesy
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2006
|
z. 2/77
103-108
7
Content available ATR Track III: the real-time GPS for public security
Kwiecień J., Malinowski M., Bujnowski S., Bujarkiewicz A.
Reports on Geodesy
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2006
|
z. 2/77
179-185
EN
In the project a system was developed, that visualizes real time GPS navigation data over the public security system. Vehicles equipped with GPS/GSM unit can connect to the city security system (tel. 112) via Internet and multiple viewer users can track their motion in real-time. A client-server system passes GPS position data from the vehicles on the GIS editor and vector/raster MultiViewer application.
8
Content available Analyses of different methods used for creation of digital terrain model (DTM)
Pająk K., Ciećko A., Oszczak S.
Reports on Geodesy
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2006
|
z. 2/77
211-217
EN
It is possible to conect data for creation of DTM using different measurment technologies. The paper describes different technologies used for collection of data for creation of DTM. First the precise GPS RTK method with the use of GSM/GPRS transmission of corrections is presented. Precise RTK method is used for real time determination of horizontal and vertical coordinates of the points used in the model. This method is very precise and effective. Second method in our research was the photogrammetric method using photogrammetric digital station. Photogrammetric technology using measurements on stereo model from aerial photograph is an interesting alternative for RTK method. Finnaly classical tachimetric method of measurement is presented. This method is considered as the most reliable but also the most time consuming. All presented methods were used for DTM creation of the same test area. The comparisons of the methods and analyses are given in the paper. Conclusions and plans for the future work are presented.
9
Content available remote Two new permanent GPS observatories in the Czech Republic - Snezka and Biskupska Kupa
Schenk V., Kottnauer P., Schenkova Z., Rucky A., Psenicka J., Rehak J.
Reports on Geodesy
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2002
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z. 1/61
65-66
10
Content available remote The GPS geodynamic network East Sudeten
Schenk V., Cacoń S., Bosy J., Kontny B., Kottnauer P., Schenkova Z.
Reports on Geodesy
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2002
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z. 1/61
69-72
11
Content available remote Real time positioning and data transmition for rescue services
Cefalo R., Degrassi F., Manzoni G., Moro A., Martinolli S., Pagurut R., Piemonte A., Sluga T.
Reports on Geodesy
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2002
|
z. 1/61
265-269
12
Content available remote Problems of comparative plotting of the ship`s position
Stateczny A.
Reports on Geodesy
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2002
|
z. 1/61
227-233
EN
In recent years the the problem of position plotting in navigation has been dominated by satellite systems, the GPS in particular. These system are used both at sea (maritime navigation) and in the air (aerial navigation) as well as on land (terrestrial navifgation).With the application of satellite systems the position can be plotted within very short spaces of time, in the range of a few or a dozen seconds. Reluing exclusively on satellite systems, however, exposes to the danger of losing information in case of average, intentional switch-off disturbance and possible enconding of information reaching the user. This results in the necessity of having yet another, autonomous system at one`s disposal (independent of external information sources) making possible the plotting of position in an autonomous way. The article presents solutions of basic problems of computer ship position plotting means of comparative methods.
13
Content available remote Polish maritime DGPS reference stations coverage after the implementation of new frequency net - preliminary results
Specht C.
Reports on Geodesy
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2002
|
z. 1/61
208-216
EN
According to IALA recommendations and ITU-R approval, a new frequency plan for DGPS reference stations in The European Maritime Area was initiated on 19th of September 2001. Radio broadcasting systems of two Polish DGPS reference stations: Rozewie and Dziwnow has been returned to new assigned frequencies. In result it caused a necessity to modify their signal coverages based on former measuring campaigns followed after the transmitting antennas were modernized (Rozewie in 1998 and Dziwnow in 2001). The article presents some results of DGPS signal strength simulation and actual measurements, as well as resulted, common DGPS RS coverage of both stations. Presented calculations were done on a base of the specialization software. For signal attenuation determination, a South Baltic Sea vector chart of the conductivity data was used. In result, the new values for Effective Radiated Power and nominal ranges were established.
14
Content available remote Permanent GPS Station Sulp: problems and preliminary results
Abrikosov O., Zablotskyj F., Savchuk S.
Reports on Geodesy
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2002
|
z. 1/61
77-81
15
Content available remote On determination of GPS antenna phase centres at the geodetic observatory Pecny
Kostelecky J.
Reports on Geodesy
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2002
|
z. 1/61
145-152
EN
Higher accuracy requirements for results of GPS measurements (mainly for geodynamic purposes) introduce a problem of determination of phase centres of used GPS antennas. The method of field calibration with rotation of the antenna is a suitable compromise between financial requirements and accuracy of results. This method was applied to antennas used in the GPS permanent service at the GOPE station, Czech Republic. Results were used to explain some phenomena in time series of the station coordinates. Jumps in horizontal components of the time series were explained by differences in phase centres` positions. An introduces milimetre differences in phase centres` positions and the snow induces centimetre changes in the vertical component of phase centres` positions.
16
Content available remote New tidal gravimetric laboratory in Jozefoslaw
Bogusz J.
Reports on Geodesy
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2002
|
z. 1/61
153-159
EN
Since the middle of 2001 the Astro-Geodetic Obserwatory in Jozefoslaw has been equipped with new ET-26 LaCosteand Romberg gravimeter. This instrument is strictly dedicated to the Earth tides measurements. It has double lever system, double oven heating system and electrostating nulling which provide greater reliability and accuracy. This paper is aimed at describing the actions that had to be done before the recording started in the tidal laboratory in new building of the Jozefoslaw Observatory. These activities for instance were: electronic levels adjustment, instrumental phase lag determination as well as correctness of the voltmeter constant evaluation checking. The presentation contains the preliminary results of measurements at the tidal parameters (amplitude factors and phase shifts) derived from adjustment of first 5-months data. The concept of the synchronized tidal measurements made by two LC&R gravimeters (ET-26 and D-196) working in almost identical conditions in the same laboratory in Jozefoslaw is also presented.
17
Content available remote GPS derived integrated precipitable water-some remarks and proposed applications
Kruczyk M., Rogowski J.
Reports on Geodesy
|
2002
|
z. 1/61
183-195
18
Content available remote Establishment of a new permanent station in the area of a Plitvice Lakes
Medak D., Pribicevic B.
Reports on Geodesy
|
2002
|
z. 1/61
37-45
EN
Two GPS-permanent stations in the Republic of Croatia that were established in 2000, Dubrovnik and Osijek, became the part of two international networks designed for monitoring Earth`s crustal movements: EUREF-Permanent and International GPS-service for Geodynamics. Two another permanet stations, in Zagreb and Pula, are operating for long time and their inclusion in international projects has been recently considered. Within the working group dealing with the international geodynamic test-area Plitvice Lakes part of CEI programme CERGOP-2 a very important task would be to establish a new permanent station in this area. In this paper we review the basic tectonic pattern of the east Adriatic coast, the background of the IGS and EUREF Permanent projects, current situation of permanent stations in Croatia with a proposal for development of a Croatian GPS-permanent stations network. Such a network could be used for both numerous scientific investigations and practical real-time navigation on the land, at the sea and in air. The station in the area of Plitvice Lakes will be indispensable aid in all activities related to observation of geodynamic and hydrogeologic activity of the lakes.
19
Content available remote Dynamic vision for motion determination of Mobile Mapping System
Crocetto N., Guarnieri A., Vettore A.
Reports on Geodesy
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2002
|
z. 1/61
261-264
EN
One of the main components of a Mobile Mapping System is represented by the Intertial Navigation Unit (INS) which along with an on-board GPS receiver allows the retreval of the van trajectory. Drifts are the main drawback of INS, affecting the overall positioning precision of the van. In order to improve its performance two solutions have been approached: 1) processing and adjustment of GPS and INS errors by Kalman filtering 2) employing of expensive INS, which leads, unfortunately , to considerable increase of the final cost of the whole system. An MMS is also tipically provided with at least two CCD cameras (color or B/N). by which the possitioning information of interesting land features can be acquired. This operation relies upon algorithms, such as camera calibration, space resection, image processing, developed for Digital Photogrammetry and Computer Vision. Given this background, in this work we propose to investigate the feasability of a dynamic model to retrieve the van motion via monocular vision, avoiding the use of INS.
20
Content available remote Analysis of GPS measurement campaigns in Tatra Mountains
Czarnecki K., Mojzes M., Papco J.
Reports on Geodesy
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2002
|
z. 1/61
73-76
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