An Advanced Synthetic Aperture Radar (ASAR), operating at C-band, ASAR ensures continuity with the image mode (SAR) and the wave mode of the ERS-1/2 AMI. It features enhanced capability in terms of coverage, range of incidence angles, polarisation, and modes of operation. This enhanced capability is provided by significant differences in the instrument design: a full active array antenna equipped with distributed transmit/receive modules which provides distinct transmit and receive beams, a digital waveform generation for pulse "chirp" generation, a block adaptive quantisation scheme, and a ScanSAR mode of operation by beam scanning in elevation.
Imaging microwave radars
Radiometric resolution in range: 1.5-3.5 dB, Radiometric accuracy: 0.65 dB
Image, Wave and Alternating Polarisation modes: approx 30m x 30m.Wide Swath mode: approx 150m x 150m. Global Monitoring mode: approx1000m x 1000m.
Image and alternating polarisation modes: up to 100km, Wave mode:5km, Wide swath and global monitoring modes: 400km or more
Microwave: C-band, with choice of 5 polarisation modes (VV, HH,VV/HH, HV/HH, or VH/VV)
Land ( Landscape Topography ), Snow and Ice ( Snow and Ice ), Ocean and Coast ( Ocean Currents and Topography )
Latest Mission Operations News
New service open to (A)SAR data users: ESA's Envisat ASAR Image Mode archive released for On-The-Fly data download
28 July 2016
As previously anticipated, ESA has implemented a significant improvement for users to obtain (A)SAR data products.
The new On-The-Fly (OTF) service enables users to trigger (A)SAR L1 data processing and data download directly from ESA's complete archive.
Related Data Types
Related (Key) Documentation