DTU Space Technical

1 month ago | agupubs.onlinelibrary.wiley.com | Xu Chen |Shengjun Zhang |Ole Andersen |DTU Space Technical

1 Introduction Satellite altimetry employs an onboard active microwave altimeter to measure the average instantaneous distance from the satellite antenna phase center to the footprint area on the sea surface. The initial design objective was to measure the undulations of marine geoid (Kaula, 1961).