Minimize RA-2
Instrument image

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.

Not Operational
Radar altimeter
Technical Characteristics
Altitude: better than 4.5cm, Wave height: better than 5% or 0.25m
Spatial Resolution:
Swath Width:
Microwave: 13.575Ghz (Ku-Band) & 3.2GHz (S-Band)
Earth Topics
Land ( Topography/Mapping ), Snow and Ice ( Sea Ice ), Ocean and Coast ( Ocean Waves , Ocean Currents and Topography ), Atmosphere ( Winds )
Related Instruments
Available Resources Type Access
RA-2 FAQ Technical Document link
RA2_MWR_IPF_5.03 Technical Document link
ENVISAT RA-2 and MWR Products and Algorithms User Guide Technical Document link
The ENVISAT Radar Altimeter System (RA-2) ESA Bulletin link
Glossary Technical Document link
RA2 Products Specifications Product Document download
Annex A - Product Data Conventions Product Document download
Minimize Latest Mission Operations News

OADS-OTF planned maintenance – 09 and 10 Jan 2018

05 January 2018

Due to a scheduled maintenance starting on 09 January 2018, access to the On-The-Fly online dissemination systems will be unavailable and the access to the ERS and Envisat (A)SAR collections via EOLI-SA will also be affected during the maintenance on 10 January 2018.