Combination procedure for length-of-day time series according to the noise frequency behavior |
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| Authors: | L I Fernández D Gambis E F Arias |
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| Institution: | (1) Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, B1900 FWA Paseo del Bosque S/N. La Plata, Buenos Aires, Argentina, e-mail: lauraf@fcaglp.unlp.edu.ar, AR;(2) International Earth Rotation Service, UMR 8630, Observatoire de Paris, 61 Avenue de l' Observatoire, 75014 Paris, France, FR;(3) Bureau International des Poids et Mesures, Sèvres, France, FR;(4) Astronome Associé au Departement de'Astronomie Fondamentale (DANOF), Observatoire de Paris, 61 Avenue de l'Observatoire, 75014 Paris, France, FR |
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| Abstract: | Length-of-day (LOD) estimates from seven Global Positioning System (GPS) and three satellite laser ranging (SLR) analysis
centers were combined into an even-spaced time series for a 27-month period (1996–1998). This time series was compared to
the multi-technique Earth-orientation-parameter (EOP) combined solution (C04) derived at the Central Bureau of the International
Earth Rotation Service (IERS/CB). Due to inhomogeneities in the different series derived from the various techniques (time,
length, quality, and spatial resolution), the concept of a combined solution is justified. The noise behavior in LOD for different
techniques varies with frequency; the data series were divided into frequency windows after removing both biases and trends.
Different weight factors were assigned in each window, discriminating by technique, and produced one-technique combined solutions.
Finally, these one-technique combined solutions were combined to obtain the final multi-technique solution. The LOD combined
time series obtained by the present method based on the frequency windows combined series (FWCS) is very close to the IERS
C04 solution. It could be useful to generate a new LOD reference time series to be used in the study of high-frequency variations
of Earth rotation.
Received: 28 March 2000 / Accepted: 15 February 2001 |
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| Keywords: | : Earth rotation – Length of day – Combination – Filtering |
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