000195219 001__ 195219
000195219 003__ CZ-ZdVUG
000195219 005__ 20191202103119.0
000195219 041__ $$aeng
000195219 040__ $$aABC039$$bcze
000195219 1001_ $$aŠtěpánek, Petr
000195219 24510 $$aEstimation of the Length of Day (LOD) from DORIS observations
000195219 300__ $$a13 stran
000195219 5203_ $$aThe paper is devoted to the estimation of the Length of the Day (LOD) from DORIS observations and summarizes the first successful experiment with LOD estimation at the level of geodetic precision. This result is confirmed by 9 years of DORIS data (2006.0 – 2015.0). The mean difference of the non smoothed LOD series with respect to the IERS C04 model reaches a value of tens μs and a standard deviation around 120 μs for the last years of the campaign 2012.0-2015.0. However, the mean difference with respect to the reference model varies over time, reaching negative values from -60 to -20 μs for the years 2006-2011 and positive values from 80 to 120 μs for the years 2012-2014. The time variable mean difference with respect to the changes in DORIS satellite constellation is discussed, as well as the possibility of the bias reduction applying the long-term averages of the cross-track harmonics or adjustment of the geopotential coefficient C20. Moreover, the possibility of LOD adjustment in the standard DORIS solution is discussed with focus on the station coordinates estimation. In addition, the power spectrum of the difference between estimated LOD and the reference model was performed, showing the domination of the annual signal. Also LOD estimated from single-satellite DORIS solutions was analyzed to identify satellite-specific issues. The paper includes a correlation analysis of the orbit parameters, Earth rotation parameters and the geopotential coefficient C20, based on covariance matrices from weekly solutions. High correlation around 0.96 was found for LOD and the sine amplitude of the cross-track harmonic empirical acceleration, which was also confirmed analytically.
000195219 655_4 $$ačlánek v odborném periodiku
000195219 7001_ $$aFiller, Vratislav
000195219 7001_ $$aBuday, Michal
000195219 7001_ $$aHugentobler, Urs
000195219 7730_ $$92018$$dNizozemí:Elsevier,2018.$$g62. (2), s.370-382$$tAdvances in Space Research$$x0273-1177
000195219 8564_ $$uhttps://www.sciencedirect.com/science/article/pii/S0273117718303703?via%3Dihub
000195219 85642 $$ahttps://www.rvvi.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F18%3AN0000048%21RIV19-GA0-00025615
000195219 910__ $$aABC039
000195219 980__ $$aclanky_vugtk
000195219 985__ $$astepanek
000195219 985__ $$ariv
000195219 985__ $$autvar24
000195219 985__ $$afiller