The CryoSat-2 mission is designed to determine fluctuations in the mass of the Earth’s land and the marine ice fields. Its primary payload is a radar altimeter that operates in different modes optimised depending on the kind of surface: Low resolution mode (LRM), SAR mode (SAR) and SAR interferometric mode (SARIn). This instrument is named SIRAL: SAR Interferometric Radar Altimeter. Transponders are commonly used to calibrate absolute range from conventional altimeter waveforms because of its...