A prime ILRS end-product is SLR site positions/coordinates and velocities.
Coordinate solutions are produced independently by ILRS analysis
centers and have been combined by the ILRS combination centers to produce the official IERS contribution to the International Terrestrial Reference
Frame (ITRF). SLR coordinate
solutions are used as the definition of the ITRF origin and its
linear rate of change. In addition, the ITRF scale and its linear rate of change was
defined by the combination of SLR and VLBI coordinate solutions.
The responsibility of combining coordinate solutions from a given space
geodetic technique (i.e. SLR, GPS, VLBI, DORIS) will migrate from the ITRS to the
respective geodetic services (i.e. ILRS, IGS, IVS, IDS). The ITRS will still generate the
combined ITRF coordinate solution, but will only accept one solution from each geodetic
service. This task of generating the single combined SLR coordinate solution resides with the ILRS Analysis Working Group (AWG).