Abstract Satellite laser ranging (SLR) to the satellites of
the global navigation satellite systems (GNSS) provides substantial
and valuable information about the accuracy and
quality of GNSS orbits and allows for the SLR-GNSS colocation
in space. In the framework of the NAVSTAR-SLR
experiment two GPS satellites of Block-IIA were equipped
with laser retroreflector arrays (LRAs), whereas all satellites
of the GLONASS system are equipped with LRAs in
an operational mode. We summarize the outcome of the
NAVSTAR-SLR experiment by processing 20 years of SLR
observations to GPS and 12 years of SLR observations to
GLONASS satellites using the reprocessedmicrowave orbits
provided by the center for orbit determination in Europe
(CODE). The dependency of the SLR residuals on the size,
shape, and number of corner cubes in LRAs is studied. We
show that the mean SLR residuals and the RMS of residuals
depend on the coating of the LRAs and the block or
type of GNSS satellites.