engleski

Status of the Croatian First Order Gravity Network

Since Croatian Geodetic Institute (CGI) started to work in December 2001 preliminary work considering measurements of the Croatian First Order Gravity Network has been carried out. The network will be connected to the Croatian Zero Order Gravity Network. For measurements of the Croatian First Order Gravity Network two Scintrex CG-3M gravimeters are prepared: HGI-1 and HGI-2. Their behavior and capabilities are systematically analyzed: drift, temperature compensation, tilt sensor zero adjustment, tilt sensor sensitivity adjustment, tilt sensor cross coupling, battery check and gravimeter clock drift. In this period drifts of the both gravimeters become more linear, and that is improvement of the main gravimeter characteristic. To analyze structure of a gravimeter signal in detail, stability of the HGI-2 gravimeter is analyzed using wavelet multiresolution technique. To verify gravimeters in the fieldwork, test measurements were done. Design of the test gravity network contains two absolute gravimetric points. That is giving opportunity for reliable verification of the gravimeters. Gravimeters analysis is showing that they can be used in measurements of the Croatian First Order Gravity Network.

gravity network; relative gravimeters; status report for Croatia

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