A Simulation Study for Future Geodetic Satellites Tracked by Satellite Laser Ranging
Joanna Najder; Krzysztof Sośnica; Dariusz Strugarek; Radosław Zajdel
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Ministerial score = 140.0
Journal Impact Factor (2023) = 3.9 (Q1)
Satellite laser ranging (SLR) measurements play a key role in determining global geodetic parameters, such as station coordinates, geocenter motion, low-degree Earth's gravity field parameters, and Earth rotation parameters. Observations to two LAser GEOdynamics Satellites (LAGEOS) and two Etalon satellites provide operational standard products and contribute to the realization of the scale and the origin of the International Terrestrial Reference Frame (ITRF). Currently, an extension of the ITRF realizations is being considered with the inclusion of the Laser Relativity Satellite (LARES). In July 2022, the LARES-2 satellite was launched with the main purpose to verify fundamental physics, especially the Lense-Thirring effect emerging from General Relativity. We simulate orbits and observations for the LARES-2 satellite, as well as the LARES-like satellites, which complement the current constellation of LAGEOS-1/-2 and LARES-1/-2 using the butterfly configuration. We assess the impact of the observations to satellites with different orbital parameters on the determination of global geodetic parameters. We show that placing a satellite in a retrograde orbit (against the Earth's rotation), can improve the quality of the global geodetic parameters. The solution based on LAGEOS-1/-2 + LARES-1/-2 + a satellite supplementary to LAGEOS-2 in a retrograde orbit achieves the 3D mean error at the level of 1.62 mm for the station coordinates, and mean errors of 0.7, 0.7, and 1.3 mm for the X, Y, and Z geocenter components, respectively, bringing us closer to fulfilling the requirements established by the Global Geodetic Observations System (GGOS) of 1 mm accuracy for the reference frame stability.
DOI:10.1029/2022JB026192
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