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Frm4alt International Review Workshop

“International Review Workshop On Satellite Altimetry Cal/Val Activities and Applications"

23-26 April 2018,
Chania, Crete, Greece.

Workshop url



Transponder calibration

Transponder calibration at the CDN1 ESA Altimeter Calibration Site:

  • CryoSat-2 on 5-Feb-2018 18:41:47 UTC (Previous Cal/Val 5-Jan-2018 at 8:04:26 UTC),
  • Tandem mission of Jason-2 and Jason-3, March-October 2016,
  • Jason-3 continuously every 10 days after its launch,
  • Sentinel-3A every 27 days at 20:00:12 UTC continuously after its launch.



What is FRM for Altimetry?
Why need FRM now?
How to implement it?

Download: Webstory 2

Accurate determination and monitoring of sea-level changes are of fundamental value and crucial in understanding the ocean’s influence on our weather patterns and long-term climate change of our planet. For more than 30 years, satellite altimetry has been monitoring changes in sea level and climate, unequivocally, over regional to global scales with [mm/yr] accuracy and reliably, with respect to the center of mass of the Earth.

  • Fiducial Reference Measurements for Altimetry (FRM4ALT) are essential so that monitoring of the ocean and its changes is maintained:
  • Objective, continuous, homogeneous and reliable;
  • Free of errors and biases for any mission;
  • Uninterrupted and tied from one mission to the next.


ESA logo  IAG logo 2016 


 GeoMatLab Logo  DTU Space 2017 Space Logo

frm4alt logo 6 Dec 2017