blue arrow Instrument Overview

RA-2 map

Radar Altimeter 2 (RA-2) was an instrument on board the Envisat satellite, which determined the two-way delay of the radar echo from Earth's surface to a very high precision: less than a nanosecond. It also measured the power and the shape of the reflected radar pulses.

The RA-2 instrument was a dual-frequency, nadir-pointing, pulse-limited radar operating at 13.575 GHz (Ku-band) and 3.2 GHz (S-Band) using a single antenna dish and was based on the heritage of the ERS-1 RA. It was designed to operate autonomously and without interruption over all surfaces: ocean, land and ice. RA-2 was the first high-latitude altimeter that aimed to improve the precision of previous altimeters over open oceans (ERS satellites), enhancing operations over ice sheets.


blue arrow Data

blue arrow DATA DOWNLOAD

Download data from the Envisat RA-2 mission through the ESA Online Dissemination System. The data is freely available to registered users.


All Envisat RA-2 products, in accordance with ESA Earth Observation Data Policy, are freely available to users. Read more about the available RA-2 products:

blue arrow DATA TOOLS

The BRAT tool can be used to visualise and process RA-2 data.


Broadview Radar Altimetry Toolbox (BRAT) is an extensive tutorial on what is altimetry, techniques used and examples of usage of data; plus software to read, process and visualise altimetry data.

Read more

blue arrow Cal/Val

The goal of RA-2 calibration and validation activities was to verify the accuracy and quality of data the instrument acquired. The RA-2 Cal/Val Plan, Calibration Activities and Validation Activities are available.

blue arrow Quality Control Reports

Quality Control is monitoring routinely the status of the spacecraft (payload and platform) and to check if the derived products meet the quality requirements along mission life-time. Daily and monthly reports are available for RA-2 quality monitoring.