Epoch Reference Frames as Short-Term Realizations of the ITRS

Bloßfeld, M; Seitz, Matthias; Angermann, D

doi:10.1007/1345_2015_91

Cited by 3 publications

(2 citation statements)

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“…Our approach is based on the concepts developed by Bloßfeld et al (2014Bloßfeld et al ( , 2015, whereby the epoch-wise independently realized geodetic datum parameters shall be stabilized by an appropriate filtering. As all combination steps are performed at the NEQ level, we implement an information filtering approach, a transfer of the Kalman filter (Kalman, 1960) approach from the solution level to the NEQ level (e.g., Assimakis et al, 2012;Chin, 2001).…”

Section: Filteringmentioning

confidence: 99%

“…A major issue of geodetic datum parameters realized from SLR and VLBI for short observation periods is that they suffer from an inhomogeneous station distribution and permanently changing observation network geometries, the so‐called “network effect” (Collilieux et al., 2009). Based on DGFI‐TUM's approach to realize the datum of geodetic reference frames by combining the space‐geodetic techniques at the normal equation level (e.g., Angermann et al., 2004; M. Seitz et al., 2012, 2022) comparisons between previous DTRF multi‐year reference frames and epoch‐wise independent realizations of the ITRS from short observation periods revealed that a sophisticated treatment of the network effect is required to realize reliable non‐linear station displacement time series (Bloßfeld et al., 2014), whereby the reliability of the resulting datum parameters and the temporal resolution of the epoch‐wise solutions are in an inverse relationship (Bloßfeld et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

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Combination Strategy for the Geocentric Realization of Regional Epoch Reference Frames

et al. 2022

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For high‐resolution regional geodetic applications, the International Terrestrial Reference Frame (ITRF) is complemented by regional densifications. These are realized either as multi‐year solutions related to a tectonic plate (e.g., EUREF for Europe) or as epoch reference frames (ERFs) to capture nonlinear geophysical station motions caused by, for example, earthquakes or non‐tidal loading (e.g., SIRGAS for Latin America). These Global Navigation Satellite Systems (GNSS)‐only based regional reference frames have in common that their geodetic datum is aligned with the ITRF datum at a specific epoch. The consequence is that their origin represents the Earth's center of figure and does not coincide with the instantaneous center of mass. Here, we present studies on a direct geocentric realization of regional ERFs. We propose to realize the geodetic datum for each epoch by combining global GNSS, Satellite Laser Ranging, and Very Long Baseline Interferometry networks via measured local ties at co‐located sites. A uniformly distributed global GNSS network is used to realize the orientation via a no‐net‐rotation constraint with respect to the ITRF and is densified by the stations of the regional subnetwork. The developed combination and filtering strategy aims to guarantee a stable datum realization for each epoch‐wise solution. Validating our results against global reference frames and geophysical loading models relating to the Earth's centers of mass and figure, we show that the realized displacement time series are geocentric and reflect seasonal geophysical processes. As the approach does not need to rely on co‐location sites in the region of interest, it is conceptually transferable to other regions on the globe.

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