An Overview Of The New CGPS Stations Established During The ESEAS-RI Project

Mehmet E. Ayhan(1), Dov S. Rosen(2), Richard Bingley(3), Bojan Cernac(4), Jose M. Davila(5), Maria J. Garcia(6), Athanasios Mavraeidopoulos(7), Halfdan P. Kierulf(8), Nenad Leder(9), Eimuntas Parseliunas(10), Begona Perez(11), Hans-Peter Plag(8), Ryszard Zdunek(12)

(1) General Command of Mapping
Ankara, Turkey
(2) Israel Oceanographic & Limnological Research, National Institute of Oceanography
Tel Shikmona, POB 8030, Haifa, Israel
(3) Institute of Engineering, Surveying and Space Geodesy
University of Nottingham, Nottingham, U.K.
(4) Environmental Agency of the Republic of Slovenia Ljubljana
(5) Universidad Politécnica de Cataluña Barcelona, Spain
(6) Spanish Institute of Oceanography Madrid
(7) Oceanography Division of HNHS Athens
(8) Norwegian Mapping Authority
Honefoss, Norway
(9) Hydrographic Institute of the Republic of Croatia Split
(10) Geodetic Institute of Vilnius Gediminas Technical University
Vilnius, Lithuania
(11) Puertos del Estado Madrid
(12) SRC Space Research Centre, Polish Academy of Science,
Warszawa, Poland


In order to measure absolute sea level changes, providing sea level in the same reference frame as the satellite altimeters, and to differ vertical land movement and sea level change, collocation of a tide gauge station with Continuous GPS(CGPS) is essential. Considering this fact, 10 ESEAS tide gauge stations ( Antalya, Ashdod, Sdot-Yam, Ibiza, Klaipeda, Koper, Lefkas, Puerto de la Luz, Split, Wladyslawowo ) are selected to collocate with new CGPS sites. CGPS hardware, purchased to be installed to the sites by the partners, are: four Trimble 5700 CORS, four Ashtech MicroZ, one Ashtech ICGRS, and one Topcon Legacy E, with mostly choke ring antennas. Presently the collocated CGPS sites are operational except Koper and Lefkas at which installation will be finished at the end of the year 2004. A few operational stations still have problems with online data downloading and uploading which will be solved soon. Furthermore, in order to test dual-CGPS concept for local vertical land motions, a new CGPS site with Trimble 4000 SSI receiver supported by the resident institution is installed at Ceuta tide gauge station.

The presentation will discuss the problems related to the site selection, instrument selection, monumentation, installation, and operation of the CGPS, and their linking to the Tide Gauge Bench Mark (TGBM) at each site.

Conclusions related to the experience gained from these CGPS stations installation and operation will be presented to serve future CGPS installations and linking to TGBMs.