LARES, an Italian satellite launched in 2012, and its successor LARES-2 approved by the Italian Space Agency, aim at the precise measurement of frame dragging predicted by General Relativity and other tests of fundamental physics. Both satellites are equipped with Laser retro-reflectors for Satellite Laser Ranging (SLR). Both satellites are also the most dense particles ever placed in an orbit around the Earth thus being nearly undisturbed by nuisance forces as atmospheric drag or solar radiation pressure. They are, therefore, ideally suited to contribute to the terrestrial reference frame (TRF). At GFZ we have implemented a tool to realistically simulate observations of all four space-geodetic techniques and to generate a TRF from that. Here we augment the LAGEOS based SLR simulation by LARES and LARES-2 simulations. It turns out that LARES and LARES-2, alone or in combination, can not deliver TRFs that meet the quality of the LAGEOS based TRF. However, once the LARES are combined with the LAGEOS satellites the formal errors of the estimated ground station coordinates and velocities and the co-estimated Earth Rotation Parameters are considerably reduced. The improvement is beyond what is expected from error propagation due to the increased number of observations. Also importantly, the improvement concerns in particular origin and scale of the TRF of about 25% w.r.t. the LAGEOS-combined TRF. Furthermore, we find that co-estimation of weekly average range biases for all stations does not change the resulting TRFs in this simulation scenario free of systematic errors.

Impacts of the LARES and LARES-2 Satellite Missions on the SLR Terrestrial Reference Frame / Konig, R.; Glaser, S.; Ciufolini, I.; Paolozzi, A.. - 151:(2021), pp. 57-65. (Intervento presentato al convegno 9th Hotine-Marussi Symposium on Mathematical Geodesy, 2018 tenutosi a ita) [10.1007/1345_2019_84].

Impacts of the LARES and LARES-2 Satellite Missions on the SLR Terrestrial Reference Frame

Ciufolini I.;Paolozzi A.
2021

Abstract

LARES, an Italian satellite launched in 2012, and its successor LARES-2 approved by the Italian Space Agency, aim at the precise measurement of frame dragging predicted by General Relativity and other tests of fundamental physics. Both satellites are equipped with Laser retro-reflectors for Satellite Laser Ranging (SLR). Both satellites are also the most dense particles ever placed in an orbit around the Earth thus being nearly undisturbed by nuisance forces as atmospheric drag or solar radiation pressure. They are, therefore, ideally suited to contribute to the terrestrial reference frame (TRF). At GFZ we have implemented a tool to realistically simulate observations of all four space-geodetic techniques and to generate a TRF from that. Here we augment the LAGEOS based SLR simulation by LARES and LARES-2 simulations. It turns out that LARES and LARES-2, alone or in combination, can not deliver TRFs that meet the quality of the LAGEOS based TRF. However, once the LARES are combined with the LAGEOS satellites the formal errors of the estimated ground station coordinates and velocities and the co-estimated Earth Rotation Parameters are considerably reduced. The improvement is beyond what is expected from error propagation due to the increased number of observations. Also importantly, the improvement concerns in particular origin and scale of the TRF of about 25% w.r.t. the LAGEOS-combined TRF. Furthermore, we find that co-estimation of weekly average range biases for all stations does not change the resulting TRFs in this simulation scenario free of systematic errors.
2021
9th Hotine-Marussi Symposium on Mathematical Geodesy, 2018
LAGEOS; LAGEOS-2; LARES; LARES-2; Terrestrial reference frame
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Impacts of the LARES and LARES-2 Satellite Missions on the SLR Terrestrial Reference Frame / Konig, R.; Glaser, S.; Ciufolini, I.; Paolozzi, A.. - 151:(2021), pp. 57-65. (Intervento presentato al convegno 9th Hotine-Marussi Symposium on Mathematical Geodesy, 2018 tenutosi a ita) [10.1007/1345_2019_84].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1494182
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