Imaging Random Media Effects for Imaging

Sensor array imaging in heterogeneous, strongly backscattering media is complicated by a serious issue: The coherent echoes from the scatterers that we wish to image are weak and overwhelmed by reflections from numerous inhomogeneities (the clutter). Coherent imaging in such media cannot work unless we filter the unwanted clutter reflections. We present two filtering approaches: The first uses arrival times and is specialized to finely layered media. The second approach is more general, and it is based on the spectral analysis of the local cosine transform of the scattering matrix recorded at the array.