Publication detail

Estimation of the Length of Day (LOD) from DORIS observations

ŠTEPÁNEK P., HUGENTOBLER U., BUDAY M., FILLER V..

Original Title

Estimation of the Length of Day (LOD) from DORIS observations

Type

journal article in Web of Science

Language

English

Original Abstract

Abstract: The 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 hundredths ms and a standard deviation around 0.12 ms for the last years of the campaign 2012.0-2015.0. However, the mean difference with respect to the reference model was varying over time, reaching positive values from 0.5 to 0.10 ms for the years 2006- 2013 and negative values from -0.05 to -0.09 ms for the years 2012-1014. 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 0.98 was found for LOD and the sine amplitude of the cross track harmonic empirical acceleration, confirmed also theoretically.

Keywords

DORIS IDS Earth rotation parameters Length of the day

Authors

ŠTEPÁNEK P., HUGENTOBLER U., BUDAY M., FILLER V..

Released

15. 8. 2018

Publisher

ELSEVIER

ISBN

0273-1177

Periodical

ADVANCES IN SPACE RESEARCH

Year of study

62

Number

2

State

United Kingdom of Great Britain and Northern Ireland

Pages from

370

Pages to

382

Pages count

12

URL

https://www.sciencedirect.com/science/article/pii/S0273117718303703

BibTex

@article{BUT155566,
  author="Michal {Buday}",
  title="Estimation of the Length of Day (LOD) from DORIS observations",
  journal="ADVANCES IN SPACE RESEARCH",
  year="2018",
  volume="62",
  number="2",
  pages="370--382",
  doi="10.1016/j.asr.2018.04.038",
  issn="0273-1177",
  url="https://www.sciencedirect.com/science/article/pii/S0273117718303703"
}