TOPEX, Jason-1 and Jason-2.
None of which can measure 2.28 millimeters accurately. All the errors and lack of resolution in all the variables stipulates there isn’t the ability to accurately measure oceans to the millimeters claimed. The resulting claims are nothing but politically driven. They claim to have resolution to ascertain that oceans have been rising 2.28 millimeters (.09 inches) per year since 2001. Yeah, right.
The system used to declare such accuracy isn’t that accurate itself. DORIS, a French system, cannot measure satellite orbits to the millimeters the satellites claim. DORIS claims 2cm orbital accuracy, using a 2.03625 GHz signal. It has less accuracy than the WGS84 measurements.
Again, no satellite system can measure ocean heights to the millimeters claimed.