POLARISATION-DEPENDENT SIGNATURES OF SHIPSIN ENVISAT AP MODE DATA

摘要

The ENVISAT ASAR (Advanced Synthetic AperturernRadar) AP (Alternating Polarisation) mode provides arnnew opportunity for spaceborne monitoring of vesselrntraffic and fishing activities. A series of data has beenrncollected and analysed over Canadian and Norwegianrnwaters, as well as other locations of opportunity. Threernvessels were imaged during a Canadian trial and an oilrnproduction vessel in the Norne field has been imagedrnwith various ASAR beams and polarisations to studyrnthe polarisation-dependent signatures of known ships.rnCross-polarised data give better contrast for automatedrndetection compared to co-polarised data, especiallyrnwhen the incidence angle is small.