Over the three decades several different satellites have been used to measure sea level change. Kleinherenbrink et al. looked at the drift between systems and conclude there has been no statistically significant increase.
“Based on four different weighting methods used in a tide-gauge comparison it is determined that TOPEX is drifting and not ERS. Therefore, we suggest to calibrate the TOPEX GMSL record with the crossover of ERS1&2 after the removal of cal-1. The calibration reduces the observed acceleration in GMSL, so that it becomes statistically equivalent to zero at the 95%-confidence level.”
DB2