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
In addition to the newly released ASAR Image Mode (IM) data, the ASAR Alternating Polarisation Mode (AP) archive for the entire Envisat mission has now been included for data processing and download via the new (A)SAR On-The-Fly (OTF) service.
Related Data Types
Related (Key) Documentation