SAR and Moving Target Indication
نویسنده
چکیده
Synthetic aperture radar provides high-resolution images of the non-moving ground scene, but fails to indicate and position moving objects. A short review of the motioninduced effects occurring in SAR images will open this lecture. Like in special airborne MTI systems, the solution to the SAR MTI problem is to use an array of antennas or subapertures and several receiving channels to cancel the interfering clutter. Popular methods for the recognition of motion are ATI (Along Track Interferometry) and DPCA (Displaced phased centre Antenna) applied to a pair of phase centres. ATI yields image-like interferograms with high information content but fails for instance for the azimuth re-positioning of moving target signals interfered by clutter. In contrast, DPCA commonly permits sufficient clutter suppression but also prevents an accurate repositioning of the moving object in the SAR image. An efficient generalization of DPCA is adaptive space-time processing (STAP), which can be simplified to frequencydependent spatial processing in the Doppler domain.
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