CoAuthors

Guilhem Moreaux (CLS, France)

Monitoring the monument stability of the DORIS ground stations network is of key importance to achieve the millimeter accuracy objective in position for the terrestrial reference frame determination. The purpose of this study is to obtain meaningful information from stations positions time series, examining the residual coordinate time series, i.e. after subtracting the mean linear velocity from the original time series aligned to the ITRF2014.
The current standard monuments of the DORIS network can be divided into two main categories: directly anchored to the ground / mounted on building roof terrace. We selected significant examples of monuments to provide a comparative assessment of the impact of the monumentation on the station position repeatability. In this selection, we also take into account all changes affecting the station (e.g. beacon, antenna) in order to minimize noises and systematic errors in the examined time series. To avoid any impact of the DORIS constellation change on the quality of the coordinate time series, and since all the IDS analysis centers did not add the DORIS missions at the same time, for each station, we identified from the NASA/GSFC and CNES/CLS multi-satellite solutions time periods with no change.
We try to show a correlation between the time series analysis and the empirical assessment of the monument stability.