ALONG-TRACK INTERFEROMETRIC SAR PROCESSING FOR RADARSAT-2 GROUND MOVING TARGET INDICATION

摘要

Canada's RADARSAT-2 (R2) commercial Synthetic Aperture Radar (SAR) satellite, scheduled for launch in April 2004, will have an experimental mode that will permit Ground Moving Target Indication (GMTI) measurements to be made. In this mode of operation, the radar antenna is partitioned into two sub-apertures that sequentially observe the scene of interest in time from the same point in space. One of the R2 GMTI processing approaches currently being explored is based on SAR Along-Track Interferometry (SAR-ATI) techniques, in which amplitude-phase information of the targets' interferogram is exploited to extract targets from the background clutter. An adaptive Constant False Alarm Rate (CFAR) detector, suitable for the SAR-ATI processor architecture, is derived based on histogram estimation of the clutter interferogram probability density function (PDF). The SAR-ATI processor and the CFAR detector are applied to both simulated and real airborne data and are shown to be effective in detecting slow ground movers.