Evaluation of comparisons of absolute gravimeters using correlated quantities: reprocessing and analyses of recent comparisons

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F21%3AN0000002" target="_blank" >RIV/00177016:_____/21:N0000002 - isvavai.cz</a>

Alternative codes found

RIV/00025615:_____/21:N0000003 RIV/00177016:_____/21:N0000082

Result on the web

<a href="https://link.springer.com/article/10.1007/s00190-020-01435-y" target="_blank" >https://link.springer.com/article/10.1007/s00190-020-01435-y</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Evaluation of comparisons of absolute gravimeters using correlated quantities: reprocessing and analyses of recent comparisons

Original language description

Due to the lack of a natural reference for the absolute acceleration of free-fall and gravity, absolute gravimeters are compared at international comparisons, where the gravity reference is realized based on a set of precise absolute measurements and the functional model for their processing. The main estimates of comparisons, specifically, the reference values, deviations of gravimeters (biases) and associated uncertainty estimates are obtained by the method of constrained least squares. In this paper, based on data from 6 comparisons, we demonstrate and discuss the importance of several aspects that significantly influence the estimated parameters, such as the type of the constraint, the weighting schemes, the correlations between measurements or outlier detection. Following the state-of-the-art key comparisons in metrology, we are applying correlations between measurements of a particular gravimeter for the first time, showing the ability to obtain appropriate uncertainty estimates, strictly applying the law of error propagation. The processing of comparisons by the method of least squares is described step-by-step to provide a background for analyses of absolute gravimeter comparisons in the future, reflecting all specifics of these comparisons. Estimated parameters from uniformly elaborated comparisons represent an interesting statistical data set that has been used to analyse the significance of differences between FG5, FG5X and other types of gravimeters. We believe that the described method of processing, as well as the published results, will be especially useful in the realization of the International Gravity Reference System.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10505 - Geology

Project

<a href="/en/project/LTT19008" target="_blank" >LTT19008: Research related with International Gravity Reference System</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of geodesy

ISSN

0949-7714

e-ISSN

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Volume of the periodical

95

Issue of the periodical within the volume

leden

Country of publishing house

DE - GERMANY

Number of pages

23

Pages from-to

21

UT code for WoS article

000616394800004

EID of the result in the Scopus database

2-s2.0-85100205446