Subdaily Earth rotation during the Epoch ‘92 campaign

Freedman, A. P.; Ibañez-Meier, R.; Herring, T. A.; Lichten, S. M.; Dickey, J. O.

doi:10.1029/94gl00420

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…The variations in Earth rotation seen at high frequencies (periods of 1 day and shorter) are mainly the result of changes in the ocean heights and currents due to the tidal potential generated by the Sun and Moon. Apart from these tidal effects of the oceans some atmospheric excitation of PM and UT1 is to be expected at diurnal and semidiurnal frequencies [Freedman et al, 1994; Herring and Dong, So far, papers discussing subdaily Earth rotation parameters derived from GPS data were concentrating on results stemming from intensive campaigns of 1 or 2 weeks (e.g., from GIG'91 [Lichten et al, 1992], Epoch'92 [Freedman et al, 1994], CONT'94 [Weber, 1996], or from other short time intervals [Grejner-Brzezinska and Goad, 1996]). These investigations showed that the high-frequency variations of Earth rotation due to the ocean tides may be measured by GPS.…”

Section: Introductionmentioning

confidence: 99%

High‐frequency variations in Earth rotation from Global Positioning System data

Rothacher¹,

Beutler²,

Weber³

et al. 2001

J. Geophys. Res.

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Abstract. Using the data of the global, dense Global Positioning System (GPS) network established by the International GPS Service a continuous, uninterrupted series of subdaily Earth rotation parameters (ERPs) with a time resolution of 2 hours has been generated at the Center for Orbit Determination in Europe. The series starts in January 1995 and has a length of more than 3 years. Starting from the 2-hour ERP values of this, to our knowledge, unique time series, the high-frequency variations in Universal Time (UT1) and polar motion (PM) due to ocean tides are studied and a set of sine and cosine coefficients is estimated for all the major tidal terms at nearly diurnal and semidiurnal frequencies. The GPS series is not very homogeneous (various processing changes during the 3 years) and still short compared to the length of very long baseline interferometry (VLBI) and satellite laser ranging (SLR) data sets. However, the results derived from this series are already of the same quality as the results from VLBI and SLR. A comparison of the tidal coefficients stemming from all three space-geodetic techniquek shows an agreement on the 1/zs level for UT1 and 10 microarc seconds (/zas) for PM, respectively. The RMS difference between the ocean tide amplitudes estimated from GPS data and from TOPEX/Poseidon altimeter data amounts to 0.7-0.9/zs in UT1 and 9-13/zas in PM. The residual spectrum that remains after the removal of all tidal terms has a noise level of • 5-10/zas in PM and 0.5-1/zs in UT1 and contains nontidal signals (up to 55/zas in PM and 3/zs in UT1) that might be due to the impact of the satellite orbit modeling (12-hour revolution period of the satellites) or, alternatively, due to atmospheric or oceanic normal modes.

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Section: Introductionmentioning

confidence: 99%

High‐frequency variations in Earth rotation from Global Positioning System data

Rothacher¹,

Beutler²,

Weber³

et al. 2001

J. Geophys. Res.

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“…With the planned 512 Mb/s recording and a network with wider geographical coverage, the sub-daily precision is expected to be better than earlier CONT campaigns, thus clarifying even more the deviations from the existing ocean tide model and allowing further testing of other theoretical models [10][11][12][13][14].…”

Section: Discussionmentioning

confidence: 97%

Investigation of stronger diurnal ERP signals in summer derived from the VLBI CONT08 campaign

et al. 2010

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A series of very successful Continuous Very Long Baseline Interferometry Campaigns (CONT) have been carried out at irregular intervals since 1994. One of the goals is to support high-resolution earth rotation studies. The most recent CONT08 campaign was conducted with a network of 11 observatories at an increased recording rate of 512 Mbit per second over a fortnightly time span, from which stronger diurnal variations of the Earth Rotation Parameters (ERP) have been detected. We compared the high-frequency ERP from VLBI and GPS observations during CONT02, CONT05 and CONT08 with the atmospheric angular momentum functions derived from the National Centers for Environmental Prediction/National Center for Atmospheric (NCEP/NCAR) during these periods. We attribute the detected diurnal discrepancies between the theoretical models and the CONT08 observations to atmospheric excitations. VLBI, CONT, OCCAM, earth rotation parameters, ERP Citation:Sun J, Dai C L, Jian N C, et al. Investigation of stronger diurnal ERP signals in summer derived from the VLBI CONT08 campaign.

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“…Since the 1980s, a Kalman filter, the Kalman Earth Orientation Filter (KEOF), has been used at the Jet Propulsion Laboratory (JPL) to combine and predict EOPs in support of interplanetary spacecraft tracking and navigation (Freedman et al, 1994a;Gross et al, 1998). A Kalman filter has many properties that make it an attractive method of combining Earth orientation series.…”

Section: Intertechnique Combinationsmentioning

confidence: 99%

Earth Rotation Variations – Long Period

Gross

2015

Treatise on Geophysics

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Subdaily Earth rotation during the Epoch ‘92 campaign

Cited by 15 publications

References 9 publications

High‐frequency variations in Earth rotation from Global Positioning System data

High‐frequency variations in Earth rotation from Global Positioning System data

Investigation of stronger diurnal ERP signals in summer derived from the VLBI CONT08 campaign

Earth Rotation Variations – Long Period

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