Radar Altimeter 2 (RA-2) is an instrument for determining the two-way delay of the radar echo from the Earth's surface to a very high precision: less than a nanosecond. It also measures the power and the shape of the reflected radar pulses.
It is a nadir-looking pulse-limited radar altimeter based on the heritage of ERS-1 RA functioning at the main nominal frequency of 13.575 GHz (Ku Band), which has been selected as a good compromise between the affordable antenna dimension that provides the necessary gain and the relatively low attenuation which experience the signals propagating through the troposphere.
Better than 4.5cm, Wave height: better than 5% or 0.25m
20km IFOV Altitude: 800km
Scanning technique: Nadir-only viewing, continuous sampling along track
13.575Ghz (Ku-Band) & 3.2GHz (S-Band)
Land ( Topography/Mapping ), Snow and Ice ( Sea Ice ), Ocean and Coast ( Ocean Waves , Ocean Currents and Topography ), Atmosphere ( Winds )
Latest Mission Operations News
29 October 2018
Due to a planned software maintenance on Tuesday 30 October 2018, the ERS and Envisat (A)SAR On The Fly (OTF) dissemination service will be unavailable from 09:00 to 12:00 CET.
Furthermore, the maintenance activities may impact the OTF data search on the same platform (ERS and Envisat) from 13:00 to 15:00 CET.