An Advanced Synthetic Aperture Radar (ASAR) has been selected as the i
maging radar sensor for the Envisat-1 payload. In addition to providin
g continuity of data with the single-swath, single-polarisation Active
Microwave Instrumentation (AMI) currently flying on ERS-1 (and ERS-2)
, the ASAR has the additional advantages of offering: greater coverage
, with more flexibility in the choice of swath positions, a wider rang
e of incidence angles, and a wide swath capability; dual polarisation;
and improved wave mode capabilities.