Pole coordinates and length of day from laser ranging of low Earth orbiters
|1Choliy, VY |
1Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
|Kinemat. fiz. nebesnyh tel (Online) 2021, 37(5):66-73|
|Start Page: Earth's Rotation and Geodynamics|
This article is devoted to the determination of Earth' Orientation Parameters (EOP) from reprocessing of the Laser ranging observations of the specially designed satellites. These are laser geodynamics satellites Lageos, Etalon and Low Earth Orbiters Lares, Ajisai, Starlette, Stella. New software was created by the author and a new approach was proposed to analyze each model of geodynamics phenomena, transformation or process first tests separately and only then is included into the package. Main attention was paid to the analysis of the possibility to use Laser Ranging data to Low Earth Orbiters for EOP determination. It was shown that despite the much lower Lares' orbit (height is 700 km) than the Lageos' orbit (7000 km) the resulting EOP series from Lares data have in general the same precision. It was achieved by new software and new author approach to the study of the models. Final EOP data sets at the same time were computed by combination of raw EOPs from each satellite or from the combination of the conditional equations. In the latter case the precision of the final solution is l0—l5 % better. It allows us to recommend Low Earth orbiters for geodynamics on a permanent basis.
|Keywords: Earth orientation parameters, observation processing, space geodynamics|
1. D. Bilitza, International Reference Ionosphere 1990, URSI/COSPAR, NSSDC/WDC-A-R&S 90-22.-1990 (National Space Science Data Center — World Data Center A for Rockets and Satellites, Greenbelt, Md., 1990). https://iri.gsfc.nasa.gov/docs/IRI1990pp0-84.pdf.
2. V. Ya. Choliy. On the extension of Helmert transform, Adv. Astron. Space Phys. 4, 15–19 (2014).
3. V. Choliy and V. Zhaborovsky. KyivGeodynamics++: Software for processing satellite laser ranging data, Adv. Astron. Space Phys. 1, 96–98 (2011).
4. V. Ya. Choliy and V. P. Zhaborovsky. Earth’s pole coordinates determined from Lageos-1/2 laser ranging, Adv. Astron. Space Phys. 4, 54–57 (2014).
5. IERS Conventions (2010), Ed. by G. Petit, and B. Luzum, IERS Technical Note No. 36 (Bundesamt für Kartographie und Geodäsie, Frankfurt am Main, 2010).
6. J. Picone, A. Hedin, D. Drob, et al. NRLMSISE-00 empirical model of the atmosphere: Statistical comparisons and scientific issues, J. Geophys. Res.: Space Phys. 107, SIA 15-1–SIA 15-16 (2002).