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Instrument Type: radar altimeter, Operational Mode: , Collection Type: Fixed nadir-pointing beam, Other Information: Poseidon-3 emits pulses at two frequencies (13.6 and 5.3 GHz, the second frequency is used to determine electron content in the atmosphere) and analyzes the return signal reflected by the surface. The signal round-trip time is estimated very precisely to calculate the range, after applying corrections. It measures sea level, wave heights and wind speed. It is also able to estimate atmospheric electron content. Poseidon-3 will be coupled with DORIS, in order to improve measurements over coastal areas, inland waters and ice