On the determination of vertical gravity gradients by corner-cube absolute gravimeters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F19%3AN0000010" target="_blank" >RIV/00177016:_____/19:N0000010 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025615:_____/19:N0000046

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1681-7575/ab32fb" target="_blank" >https://iopscience.iop.org/article/10.1088/1681-7575/ab32fb</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1681-7575/ab32fb" target="_blank" >10.1088/1681-7575/ab32fb</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the determination of vertical gravity gradients by corner-cube absolute gravimeters

Popis výsledku v původním jazyce

This paper describes a new approach for the determination of vertical gravity gradients (VGGs) from the measurements of corner-cube absolute gravimeters based on laser interferometry. The new approach has been obtained by the modification of the equation for linear least squares solution used in the determination of the g-values. It enables one to establish a clear mathematical relation between the gravity residuals and the VGG estimates. As it is shown, in the determination of gradients with an accuracy approaching 10 µGal/m (1 µGal = 1 x 10-8 m s-2), it is necessary to correct directly the measured quantities (time and distance pairs) for "known", or sufficiently well modelled, perturbations as e.g. self-attraction or cable effects. Generally, if the gradients are determined from the data of absolute gravimeters, systematic low frequency perturbation in the residuals have to be analysed carefully. In this way, hidden perturbations in the residuals can be identified, which might be important also for the correct estimation of the g values and associated uncertainties. This is shown on the example of a parasitic wave detected in the residuals of the FG5X-251 gravimeter, reaching a period of about 0.13 m and amplitudes up to 40 pm. Finally, we compare the gravity gradients determined by the new approach with a more accurate method using relative gravimeters. This comparison shows that the gradient estimates from the FG5X-251 absolute gravimeter are biased by about 10 µGal/m and reach reproducibility of 14 µGal/m. The effort to determine VGGs from absolute gravimeters enhanced the analyses of the measured data, identified still existing artefacts in the gravity residuals, the explanation of which should lead to improvements in the measurement model in order to obtain more accurate estimates of the g-values, VGGs and their uncertainties.

Název v anglickém jazyce

On the determination of vertical gravity gradients by corner-cube absolute gravimeters

Popis výsledku anglicky

This paper describes a new approach for the determination of vertical gravity gradients (VGGs) from the measurements of corner-cube absolute gravimeters based on laser interferometry. The new approach has been obtained by the modification of the equation for linear least squares solution used in the determination of the g-values. It enables one to establish a clear mathematical relation between the gravity residuals and the VGG estimates. As it is shown, in the determination of gradients with an accuracy approaching 10 µGal/m (1 µGal = 1 x 10-8 m s-2), it is necessary to correct directly the measured quantities (time and distance pairs) for "known", or sufficiently well modelled, perturbations as e.g. self-attraction or cable effects. Generally, if the gradients are determined from the data of absolute gravimeters, systematic low frequency perturbation in the residuals have to be analysed carefully. In this way, hidden perturbations in the residuals can be identified, which might be important also for the correct estimation of the g values and associated uncertainties. This is shown on the example of a parasitic wave detected in the residuals of the FG5X-251 gravimeter, reaching a period of about 0.13 m and amplitudes up to 40 pm. Finally, we compare the gravity gradients determined by the new approach with a more accurate method using relative gravimeters. This comparison shows that the gradient estimates from the FG5X-251 absolute gravimeter are biased by about 10 µGal/m and reach reproducibility of 14 µGal/m. The effort to determine VGGs from absolute gravimeters enhanced the analyses of the measured data, identified still existing artefacts in the gravity residuals, the explanation of which should lead to improvements in the measurement model in order to obtain more accurate estimates of the g-values, VGGs and their uncertainties.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Metrologia

ISSN

0026-1394

e-ISSN

—

Svazek periodika

56

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000480384900003

EID výsledku v databázi Scopus

2-s2.0-85074749788