SLR solutions precisely determine satellite orbits and provide geodetic information to define the Earth's reference frame.
Using the most recent data available from the ILRS network, an accurate orbit model is fitted to the SLR range data using the least squares method. The orbital model takes into account the gravitational field model of the Earth, the gravitational pull of the Moon and the nearby planets, drag from the Earth's atmosphere, Earth and ocean tides and solar radiation pressure from the light of the Sun.
This not only determines where the satellite was during that time period, but also it can predict where the satellite will be in the near future. Such predictions have limited lifetimes depending on the degree of atmospheric drag force acting on the satellite.
Courtesy of ASI
The SGF is an ILRS Analysis Centre and contributes to the combined ILRS analysis product used to form the ITRF.