Modelowanie dryftu grawimetrów La Coste & Romberg typ G przy pomiarach podstawowej osnowy grawimetrycznej w Polsce

• Autorzy: Cisak M.

Warianty tytułu

EN

Modelling of drift of La Coste & Romberg type G gravimeters at measurements of the basic gravimetric control network in Poland

• Języki publikacji: PL

Abstrakty

PL

Praca jest próbą ustosunkowania się do zjawiska dryftu. Na podstawie materiału polowego, jak i dostarczyły pomiary polskiej sieci grawimetrycznej w latach 1994 -1996, przeprowadzono analizę, która wykazuje, że tzw. dryft krótkookresowy ma charakter głównie przypadkowy.

EN

Polish gravimetric network was measured between 1994-1996 with the use o f LaCoste & Romberg relative gravimeters. These instrument is presently recognised as one o f the most precise in the world, but while using it so-called drift phenomenon also appears. Drift is the result o f decreasing the resilience force o f the main measuring system and is manifested by change o f readings in time; it is a function o f inner and outer factors. The aim o f this work was to make the detailed analysis o f drifts, which appear during measurement o f segments o f Polish gravimetric network, as it is commonly known, that proper drift elimination increases compatibility o f gravimetric measurements and hence their accuracy. In the course o f measurements the scheme o f observations: A-В, В-A, A-В was applied; it ensured repeatability o f measurements for points at three consecutive surveys. Pairs o f drifts observed on segments o f gravimetric network were the subject o f analysis. 1500 drifts were analysed in total. The charts and graphs presenting all daily drifts o f gravimeters used for measurements from June 1994 till October 1996 were prepared. As a result o f all analyses it was found, that there is no relation between measured values o f difference in acceleration and values o f drifts, which appear on this segment. No relation was observed between values o f drift and observer, but they were influenced by the way o f transporting gravimeters. Analysis o f drifts confirms the initial assumption, that for particular type o f measurements and for small time differences modelling o f drifts by first-order polynomial is sufficient; this procedure can be even omitted due to random character o f drifts.

Słowa kluczowe

PL

dryft; osnowa grawimetryczna; grawimetria; Polska

EN

drift; gravimetry; Poland

• Wydawca: Instytut Geodezji i Kartografii
• Czasopismo: Prace Instytutu Geodezji i Kartografii
• Rocznik: 1998
• Tom: T. 45, z. 96
• Strony: 109--123
• Opis fizyczny: Bibliogr. 4 poz., rys., wykr.

Twórcy

autor

Cisak M.

Bibliografia

• [1] Barlik М., Pachuta A .: Kaskadowy model eliminacji dryftu z wyników pomiarow grawimetrami LaCoste, Romberg Model G i Autograv Scintrex CG-3. Prz. Geod. 1996 nr 5
• [2] Stang van Hees G.L.: Adiustment and Quality Control of Gravity Network. Delf University o f Technology report (prywatna korespondencja), 1995
• [3] Torge W.: Grawimetry. Walter de Guyter, Berlin, New York 1989
• [4] Wenzel H.: The Vertical Gravimeter Calibration Line at Karlsruhe.Bulletin D’information 1996 nr 78