Fig. 10 Impact of station position estimation.
These reference frames typically account only for station position and linear velocities.
Where ψ is the subtended angle between the satellite and station position.
The observed range is 18 nautical miles from the coastal radar station position.
Analysis of time series of station positions of the geodetic space techniques SLR, GPS, VLBI and DORIS show, however, that these techniques allow to detect variations in station position series with up to a few millimetre accuracy.
This is achieved through the use of consider covariance parameters, specifically the ground station position and observation biases.
However, TOPEX draconitic period of about 118 days is still detected in about 20% of the station position power spectra.
To study whether fixing the station positions is the only approach when estimating UT1-UTC, we investigated the effect of estimating the non-reference station position with varying constraint levels.
The red line depicts the number of sessions that failed when the station position was estimated (right scale).
C04 (left scale) as a function of the constraint level for the station position estimation of Kokee.
