In DEM generation from ERS-2 Tandem SAR data, and after obtaining the unwrapped phase it is easy to get the height above reference ellipsoid (e.g. WGS84)
what is the accuracy of the resulting ellipsoidal height??
take a look at the attached paper.
best regards
I think that it gives information about the orthometric height ( height to port geoid )
Some starting points
http://tinyurl.com/zpa8quo
Good Luck
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