Complex demodulation in monitoring Earth rotation by VLBI: testing the algorithm by analysis of long periodic EOP components

• Autorzy: Wielgosz A. , Brzeziński A. , Böhm S.

Identyfikatory

DOI

10.1515/arsa-2016-0012

• Języki publikacji: EN

Abstrakty

EN

The complex demodulation (CD) algorithm is an efficient tool for extracting the diurnal and subdiurnal components of Earth rotation from the routine VLBI observations (Brzeziński, 2012). This algorithm was implemented by Böhm et al (2012b) into a dedicated version of the VLBI analysis software VieVs. The authors processed around 3700 geodetic 24-hour observing sessions in 1984.0-2010.5 and estimated simultaneously the time series of the long period components as well as diurnal, semidiurnal, terdiurnal and quarterdiurnal components of polar motion (PM) and universal time UT1. This paper describes the tests of the CD algorithm by checking consistency of the low frequency components of PM and UT1 estimated by VieVS CD and those from the IERS and IVS combined solutions. Moreover, the retrograde diurnal component of PM demodulated from VLBI observations has been compared to the celestial pole offsets series included in the IERS and IVS solutions. We found for all three components a good agreement of the results based on the CD approach and those based on the standard parameterization recommended by the IERS Conventions (IERS, 2010) and applied by the IERS and IVS. We conclude that an application of the CD parameterization in VLBI data analysis does not change those components of EOP which are included in the standard adjustment, while enabling simultaneous estimation of the high frequency components from the routine VLBI observations. Moreover, we deem that the CD algorithm can also be implemented in analysis of other space geodetic observations, like GNSS or SLR, enabling retrieval of subdiurnal signals in EOP from the past data.

Słowa kluczowe

EN

Earth orientation parameters; Earth rotation; very long baseline interferometry; complex demodulation

• Wydawca: Centrum Badań Kosmicznych PAN ; De Gruyter
• Czasopismo: Artificial Satellites : Journal of Planetary Geodesy
• Rocznik: 2016
• Tom: Vol. 51, No. 4
• Strony: 135--147
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Wielgosz A.

• Space Research Centre, Polish Academy of Sciences, Warsaw, Poland

autor

Brzeziński A.

• Space Research Centre, Polish Academy of Sciences, Warsaw, Poland
• Inst. of Geodesy and Geodetic Astronomy, Warsaw University of Technology, Warsaw, Poland

autor

Böhm S.

• Department of Geodesy and Geoinformation, Vienna University of Technology, Vienna, Austria

Bibliografia

• Artz, T., Tesmernée Böckmann, S., Nothnagel, A. (2011) Assessment of periodic subdiurnal Earth rotation variations at tidal frequencies through transformation of VLBI normal equation systems, Journal of Geodesy , Vol. 86(9), 565-584.
• Böhm J., Böhm S., Nilsson T., Pany A., Plank L., Spicakova H., Teke, K., Schuh, H. (2012a) The new Vienna VLBI Software VieVS, Proc. of IAG Scientific Assembly 2009, International Association of Geodesy Symposia Series , Vol. 136, 1007-1011.
• Böhm S., Brzeziński A., Schuh H. (2012b) Complex demodulation in VLBI estimation of high frequency Earth rotation components, Journal of Geodynamics, Vol. 62, 56-68.
• Brzeziński A. (2012) On estimation of high frequency geophysical signals in Earth rotation by complex demodulation, Journal of Geodynamics, Vol. 62, 74-82.
• Brzeziński A., Bizouard Ch., Petrov S. (2002) Influence of the atmosphere on Earth rotation: what new can be earned from the recent atmospheric angular momentum estimates, Surveys in Geophysics, Vol. 23, 33-69.
• Brzeziński A., Böhm S. (2012) Analysis of the high frequency components of Earth rotation demodulated from VLBI data, Proc. Journées Systémes de Référence SpatioTemporels 2011, Schuh, H., Böhm, S., Nilsson, T. and Capitaine, N. (eds.), 132-135.
• Brzeziński A., Dobslaw H., Dill R., Thomas M. (2012) Geophysical Excitation of the Chandler Wobble Revisited, Geodesy for Planet Earth, International Association of Geodesy Symposia, Kenyon, S., Pacino, M.Ch., Marti, U. (eds.), Vol. 136, 499-505.
• Brzeziński A., Dobslaw H., and Thomas M. (2014). Atmospheric and Oceanic Excitation of the Free Core Nutation Estimated from Recent Geophysical Models, Proc. IAG 2011 Scientific Assembly ”Earth on the Edge: Science for a Sustainable Planet”, Rizos, C. and Willis, P. (eds.), IAG Symposia, Springer-Verlag Berlin Heidelberg, Vol. 139, 461466.
• Brzeziński A., Ponte R. M., Ali A. H. (2004) Non-tidal oceanic excitation of nutation and diurnal/semidiurnal polar motion revisited, Journal of Geophysical Research - Solid Earth, Vol. 109(B11).
• Brzeziński A., Wielgosz A., Böhm S. (2015) On application of the complex demodulation procedure for monitoring Earth rotation: analysis of the nutation and long periodic UT1 data estimated by VieVS CD, Proc. Journées Syst´emes de Référence SpatioTemporels 2014, Malkin, Z. and Capitaine, N. (eds.), 171-174.
• Chapanov Y., Vondrak J., Ron C. (2008) Decadal Oscillations of The Earth Rotation, Exploring The Solar System and The Universe. Proc. AIP Conference, Bucharest (Romania) 2008, Mioc, V., Dumitrache, C. and Popescu, N.A. (eds). 197-200.
• Gross R. (2007) Earth rotation variations - long period, in Physical Geodesy, eds. by Herring T. A., Treatise on Geophysics, Oxford, Vol. 3, 239-294.
• Herring, T.A., Mathews, P.M., Buffett, B. A. (2002) Modeling of nutation-precession: Very long baseline interferometry results, Journal of Geophysical Research, Vol. 107(B4), 1-12.
• Höpfner, J. (1999) Interannual variations in length of day and atmospheric angular momentum with respect to ENSO cycles, Scientific Technical Report, No. STR99/07, Birmingham 1999.
• IERS (2013) International Earth Rotation and Reference Systems Service, http://www.iers.org
• IVS (2015) International VLBI Service for Geodesy and Astrometry, http://ivscc.gsfc.nasa.gov
• Lambeck, K. (1980) The Earth’s Variable Rotation: Geophysical Causes and Consequences, Cambrige University Press, Cambridge.
• Petit, G., Luzum, B. (eds.) (2010). IERS Conventions (2010). IERS Technical Note 36, Verlag des Bundesamts f¨ur Kartographie und Geod¨asie, Frankfurt am Main, Germany.
• Ray, R. D., Ponte, R. M. (2003) Barometric tides from ECMWF operational analyses Annales Geophysicae Vol. 21, 1897-1910.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).