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8 Reports on Geodesy

8 2001

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Contribution of the University of Padova to the EPN project on geokinematics

100%

Caporali A. , Baccini S.

tom z. 3/58

101-120

Time series of coordinates of permanent GPS stations are expected to exhibit a steady, linear trend in response to tectonic forces. This trend is, in fact, observed, but it is accompanied by variety of signatures, so that the overall spectral properties of the detrended, zero-mean time series differ from that of a random signal, especially in the medium (~~fraction of a year) to long (several years) period.The time series of the coordinates of 30 permanent GPS stations in the Alpine Mediterranean area with time spans from one to five years are presented.

On accuracy of IPWV determined from GPS networks

100%

Kruczyk M. , Rogowski J. , Liwosz T.

tom z. 3/58

139-142

Possibilities of imptoving the velocity estimates from CERGOP campaigns

100%

Hefty J.

tom z. 2/57

71-81

We introduce the complex model enabling to estimate from epoch GPS networks the site coordinates, velocities and also additional parameters like site eccentricities and antenna phase centre corrections. The model is applied to the Central European Geodynamic Project (CERGOP) observations performed from 1994 to 1999.

The latest geodynamical measurements in Krsko Valley

100%

Vodopivec F. , Kogoj D.

tom z. 2/57

43-49

On the basis of triangular measurements done in 1954 and GPS measurements done in 1994 the neotectonic shifts along Orliśki fault were determinated. These measurements were used by Gelogogists who have determined the stabile points for the future measurements. Measurement points have been stabilised on the new way. Ali directions and distances in the net have been determined. Up to now three measuremts were completed. On the basis of the adjustmet the new coordinates have been obtained and by those the shifts along the Orliśki fault have been determined. The GPS geodynamic net was also stabilised and observed. This net covers the whole environment of the Krsko valley. Unfortunatelly, only the zero measurement was observed so far.

Long-term monitoring of recent crustal movements in the Eastern Alps (GPS-project "Alpentraverse")

100%

Schmitt G. , Lemp D.

tom z. 2/57

21-28

For monitoring recent crustal movements in the eastern AIps, a GPS-network of 43 benchmarks has been observed in 1991, 1992, 1994 and 1999. The traverse is reaching from Munchen (Germany) to Trieste (Italy) as a regional network with a mean point distance of about 20 km. The 1999 campaign has been measured with 23 Leica GPS-receivers (System 9500, System 300 and System 200) during one week from 30.8.99 until 5.9.99. Four points have been observed 7 hours all days as permanent stations, the other points have been observed at least two times during the campaign for 5 hours. The results of the campaigns 1994 and 1999 have been processed with the Bernese software 4.2 and the comparison with the final results of 1991/1992 shows significant deformations of about 4mm/year. During the processing 3 different types of baseline strategies have been compared. The availability of at least 6 satellites during all sessions, long observation times and short baselines enabled a detection of significant movements in a 2D-deformation analysis. The paper explains the strategies of building baselines, the estimation of final coordinates and the results of the deformation analysis. It gives furtheron an outlook on possible future activities concerning 3D-deformation-analysis.

Analysis of WADGPS (Wide Area Differential GPS) kinametic data by means of ESTB (EGNOS System Test Bed) signal

88%

Cefalo R. , Gatti M.

tom z. 2/57

91-100

Detailed geoidal profile on the territory of Czech Republic and its interpretation

75%

Kostelecký J. , Pešek I. , Švabenský O. , Weigel J. , Zeman A.

tom z. 2/57

51-55

Activity of WG SNS in the field of satellite positioning and navigation report on darc in Trieste and of Pilgrim

75%

Manzoni G. , Oszczak S.

tom z. 2/57

57-69

The WG on Satellite Navigation Systems continues the activity in defining the most cheap and reliable Real Time DGPS and RTK facility for the CEI area. After having experimented several existing data radio-diffusion methods for DGPS, the DARC one, used in Austria, has been installed also in Trieste. This installation has allowed also to test in the Trieste urban environment a new vehicle positioned with DGPS and RTK integrated with an Applanix triaxial Inertial sensor. Finally a new rescue service project for mountainous environment has been initiated in Trieste based on GPS/GSM in co-operation with VIASAT and the National Mountain Research Institute. The Chair of Satellite Geodesy and Navigation, University of Warmia and Mazury in cooperation with Air Force Academy in Dęblin (Poland) performed in 2000 the experiments on trajectory determination of the AN-2 aircraft with RTK GPS on-board receiver. The flight experiments cover the en-route, approaching and landing parts of the aircraft trajectory determined using precise On-the-Fly (OTF ) satellite positioning with centimeter accuracy. The latest version of elaborated software application for monitoring of plane landing path in the horizontal and vertical planes is described and discussed. The accuracy characteristics of aircraft trajectories for all survey sessions are given and conclusions for utilization of satellite positioning in critical safety application, such as approaching and landing phase of flight are presented.