TITLE

Is the instrumental drift of superconducting gravimeters a linear or exponential function of time?

AUTHOR(S)
Michel Van Camp; Olivier Francis
PUB. DATE
May 2007
SOURCE
Journal of Geodesy;May2007, Vol. 81 Issue 5, p337
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Abstract  The instrumental drift of the superconducting gravimeter in Membach, Belgium, is estimated using 9 years of co-located and episodic absolute gravity measurements. We show that the best model of the long-term drift of the SG-C021 is an exponential. The thermal levelers used to compensate tilts are unlikely to induce the observed drift. Rather, the capacitance bridge, magnetic variations, gas adsorption on the levitating sphere, or helium gas pressure variations around it are most likely the possible combined causes of the observed instrumental drift. In practice, either linear or exponential drift models are equivalent as long as the record duration does not exceed 10 years. For longer records, this study demonstrates that an exponential models the drift better than a simple linear trend.
ACCESSION #
25016268

 

Related Articles

  • Modeling errors in upward continuation for INS gravity compensation. Christopher Jekeli; Jong-Ki Lee; Jay Kwon // Journal of Geodesy;May2007, Vol. 81 Issue 5, p297 

    Abstract  Accurate upward continuation of gravity anomalies supports future precision, free-inertial navigation systems, since the latter cannot by themselves sense the gravitational field and thus require appropriate gravity compensation. This compensation is in the form of...

  • Systematic Analyses of Raw Gravity Data for the Determination of Free-Air Gravity Anomaly of Mid-Continental Type. Okiwelu, A. A.; Okwueze, E. E. // European Journal of Scientific Research;Jun2010, Vol. 43 Issue 2, p212 

    Raw gravity data of mid-continental type were systematically subjected to analyses to produce the first free-air gravity anomaly map of Calabar Flank. The raw data were at first instance corrected for the effect of temperature/humidity and converted to milligal. The data were further corrected...

  • ACCURATE GRAVITY ANOMALY INTERPOLATION: A CASE-STUDY IN CAMEROON, CENTRAL AFRICA. Kamguia, J.; Tabod, C. T.; Tadjou, J. M.; Manguelle-Dicoum, E.; Nouayou, R.; Kande, L. H. // Earth Sciences Research Journal;Dec2007, Vol. 11 Issue 2, p108 

    Many treatments in geodesy and geophysics require regularly gridded gravity anomalies. The gridding of gravity data needs interpolation. For the predicted data to be accurate, the smoothest type of gravity anomaly should be used along with the most indicated prediction method. This paper...

  • BOUGER REDUCTIONIN KONYA BASIN EXAMPLE FOR GRAVITY DATAS AND INTERPOLATION OF GRAVITY ANOMALIES. Tongur, Vahit; Tongur, Evren Cankaya; Turgut, Bayram // Proceedings of the International Multidisciplinary Scientific Ge;2011, Vol. 2, p223 

    Gravity which is the basic potantial, can be used in geodesy, geology and other field of engineering. In order to portray earth surface, geoid is needed which is the shape of globe and tranquil sea surface lands are believed to keep on under them. In order to determine the geoid, gravity should...

  • A comparison of GPS, VLBI and model estimates of ocean tide loading displacements. Ian Thomas; Matt King; Peter Clarke // Journal of Geodesy;May2007, Vol. 81 Issue 5, p359 

    Abstract  In recent years, ocean tide loading displacements (OTLD) have been measured using the Global Positioning System (GPS) and Very Long Baseline Interferometry (VLBI). This study assesses the accuracy of GPS measurements of OTLD by comparison with VLBI measurements and...

  • GPS sidereal filtering: coordinate- and carrier-phase-level strategies. A. Ragheb; P. Clarke; S. Edwards // Journal of Geodesy;May2007, Vol. 81 Issue 5, p325 

    Abstract  Multipath error is considered one of the major errors affecting GPS observations. One can benefit from the repetition of satellite geometry approximately every sidereal day, and apply filtering to help minimize this error. For GPS data at 1 s interval processed...

  • Optimal regularization for geopotential model GOCO02S by Monte Carlo methods and multi-scale representation of density anomalies. Koch, Karl-Rudolf; Brockmann, Jan; Schuh, Wolf-Dieter // Journal of Geodesy;Aug2012, Vol. 86 Issue 8, p647 

    GOCO02S is a combined satellite-only geopotential model, regularized from degrees 180 to 250 of the expansion into spherical harmonics. To investigate the start of the regularization, the normal equations of GOCO02S have been used to compute additional geopotential models by regularizations...

  • A surface spherical harmonic expansion of gravity anomalies on the ellipsoid. Claessens, S.; Hirt, C. // Journal of Geodesy;Oct2015, Vol. 89 Issue 10, p1035 

    A surface spherical harmonic expansion of gravity anomalies with respect to a geodetic reference ellipsoid can be used to model the global gravity field and reveal its spectral properties. In this paper, a direct and rigorous transformation between solid spherical harmonic coefficients of the...

  • Towards unification of terrestrial gravity data sets in Estonia. Ellmann, Artu; All, Tarmo; Oja, Tõnis // Estonian Journal of Earth Sciences;Dec2009, Vol. 58 Issue 4, p229 

    Gravity data in Estonia have been collected by different institutions over many decades. This study assesses the suitability of available gravity data for ensuring a 1 cm geoid modelling accuracy over Estonia and in the Baltic Sea region in general. The main focus of this study is on the...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics