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PAC

Information Center for Mathematical Science

PAC

RESOLUTION ENHANCEMENT FROM SCATTERING IN PASSIVE SENSOR IMAGING WITH CROSS CORRELATIONS
Author GEORGE PAPANICOLAOU (Stanford University)
Homepage Url http://math.stanford.edu/~papanico/pubs.html#corr
Coauthors JOSSELIN GARNIER
Abstract It was shown in [Garnier et al., SIAM J. Imaging Sciences 2 (2009), 396] that it is possible to image re ectors by backpropagating cross correlations of signals generated by ambient noise sources and recorded at passive sensor arrays. The resolution of the image depends on the directional diversity of the noise signals relative to the locations of the sensor array and the re ector. When directional diversity is limited it is possible to enhance it by exploiting the scattering properties of the medium since scatterers will act as secondary noise sources. However, scattering increases the uctuation level of the cross correlations and therefore tends to destabilize the image by reducing its signal-to-noise ratio. In this paper we study the trade-o in passive, correlation-based imaging between resolution enhancement and signal-to-noise ratio reduction that is due to scattering.
Abstract Url http://math.stanford.edu/~papanico/pubftp/corr_imaging.pdf