[G04-P] Poster

[G04-P-01] Length of the Day estimated from DORIS observations

^○Petr Stepanek¹, Michal Buday¹, Vratislav Filler¹, Urs Hugentobler² (1.Research Institute of Geodesy, Topography and cartography, Zdiby, 2.Technische Universitat Munchen)

The Length of the Day (LOD) can be estimated from the DORIS data, when cross track orbit harmonics are not adjusted in the same solution. Our experiment, based on 9 years of the processed DORIS data (2006-2014) , demonstrates a possibility to reach LOD standard deviation around 0.10 msec per day (compared to reference IERS C04 model). The LOD bias is varying between the time periods and reaches the level of low hundredths msec in maximum. We also discuss the accuracy of the single satellite solutions and the multi satellite solution bias variations relations to the changes in the satellite constellation. We present the parameter correlation analysis and the relations between LOD estimation accuracy based on the solution covariance matrix and on the application of time variable gravity field, as well as the impact of the simultaneous estimation of LOD and gravity field coefficient C20.