INTERFEROMETRIC SYNTHETIC APERTURE RADAR FOR IMAGING THE OCEAN SURFACE

摘要

In a radar imaging arrangement having a platform for movement along a first direction and a plurality of radar receivers mounted on the platform, and image means for providing a respective initial radar image from the output of each said receiver, the receivers being mounted so as to have at least a component of spacing in said first direction so that there are relative phase errors between the different initial radar image signals, pairs of said initial images are combines to produce composite radar images with fringes arising from the relative phase errors, and a respective filter or filter function is developed in response to each composite image which if it is applied to one of the respective pair of initial images serves to remove or substantially reduce the relative phase errors relative to the other image of said pair. The corrected image from the adjusted initial images may be subject to adaptive Doppler filtering to emphasise particular features.