Browsing by Author "Kuzmicz-Cieslak, Magda"
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Item GEOCON: Geodetic System Ties Using a CubeSat Constellation(Copernicus Publications) Pavlis, Erricos C.; Merkowitz, Stephen M.; Beaudoin, Christopher J.; Kuzmicz-Cieslak, Magda; Rowlands, Dave D.; Lemoine, Frank G.The accuracy of the Terrestrial Reference Frame (TRF), the foundation for geolocating all Earth Observations, is currently limited by systematic errors in tying together the contributions from the different geodetic techniques. Site ties using local surveys are currently limited by uncertainties in the relative position of the physical survey points and the typically inaccessible measurement reference points of the instruments. We are investigating the development of a new measurement concept using one or more space-based reference points (satellites) to significantly reduce the errors in the site ties between co-located geodetic ground stations. The proposed concept uses a novel idea of upconverting the Global Navigation Satellite System (GNSS) signal received at the satellite and transponding it to a Very Long Baseline Interferometry (VLBI) antenna ground station. This approach does not require the satellite to be in view of more than one VLBI station at a time, allowing the use of Low Earth Orbits.Item Implementation of ITRF2020 in the ILRS Operational Products(EGU, 2023-04-03) Luceri, Vincenza; Basoni, Antonio; Sarrocco, David; Pavlis, Erricos C.; Kuzmicz-Cieslak, Magda; Evans, Keith; Bloßfeld, Mathis; Bianco, GiuseppeThe ILRS contributed to the development of ITRF2020 via the combined products submitted to ITRS. The combined products were the result of the combination of individual AC contributions where a new approach in handling systematic errors at the stations was implemented. A set of a priori estimated mean biases was considered for the main period 1993-2020 that includes data from LAGEOS, LAGEOS-2 and the Etalons, whereas an adjusted 15-day average bias at each station for the 1983-1993 period was considered to accommodate systematic and target signature errors, if a priori mean biases were missing. The implementation of ITRF2020/SLRF2020 in SLR operational products required an extended version of the SSEM model, SSEM-X, which led to the finalization of a new DH file. Considering this updated set of long-term mean biases, all ACs produced a solution set based on models used for REPRO2020 and SLRF2020 as input to a combined product intended for the IERS RS/PC at USNO. These EOP series will be used for the calibration of EOP biases prior to the release the final version of the new Bulletin A. The new bias model SSEM-X will be publicly available and maintained current over the coming years.Item Improved Atmospheric Refraction Modeling for Satellite Laser Ranging: Horizontal Refractivity Gradient Effects at Optical Wavelengths(2006-05) Hulley, Glynn; Pavlis, Erricos C.; Kuzmicz-Cieslak, MagdaItem Incorporating LARES-2 SLR Data in ILRS Products for ITRF Development(EGU, 2023-04-03) Pavlis, Erricos C.; Kuzmicz-Cieslak, Magda; Evans, KeithGeodetic network infrastructure has evolved with increasing pace the past decade with remarkable additions of modern hardware, replacing aging, ‘80s vintage equipment throughout the globe. SLR needs however more than updating the network to deliver the accuracy required today. New and improved design “targets” must also be used that support the required “1-mm accuracy”. LAGEOS was conceived and built in the early ‘70s with a ~5 mm accuracy in mind [Pearlman et al., 2019]. This limitation forced analysts to develop approaches of data analysis to ensure that even with such data one can reach the required 1-mm accuracy [Luceri et al., 2019]. Along with the network updates a parallel effort was thus initiated to modernize the space segment as well. Initially with the design and launch of LARES in 2012 [Pavlis et al., 2015] and following that, the design of LARES-2 [Ciufolini et al., 2017, Paolozzi et al., 2019], which was successfully launched on July 13, 2022 [https://www.nature.com/articles/d41586-022-02034-x]. The new mm-accurate target was quickly acquired first by the Italian station at Matera, only three days after launch and although very early in the mission, the data were of remarkably high quality and insignificant bias. This prompted a quick evaluation and a test inclusion of this target in the limited list of SLR targets supporting the ITRF development. With an orbit nearly identical to LAGEOS (with supplementary inclination), taking full advantage of all the appropriate models designed and applied to LAGEOS, we achieved 7-day orbital fits of 3-5 mm even without a tuned target signature correction. Using the approach described in [Kuzmicz-Cieslak, M. et al., 2022] and along with data from the other geodetic spheres, we have generated preliminary combination products for the development of the ITRF. We will present an overview of this initial analysis of LARES-2 data focusing on comparing these results to contemporaneously taken data from the standard four geodetic spheres only, (LAGEOS 1 & 2 and Etalon 1 & 2).