title: Time-reversal MUSIC imaging of extended targets.
abstract: This paper develops, within a general framework that is applicable to rather arbitrary electromagnetic and acoustic remote sensing systems, a theory of time-reversal "MUltiple Signal Classification" (MUSIC)-based imaging of extended (nonpoint-like) scatterers (targets). The general analysis applies to arbitrary remote sensing geometry and sheds light onto how the singular system of the scattering matrix relates to the geometrical and propagation characteristics of the entire transmitter-target-receiver system and how to use this effect for imaging. All the developments are derived within exact scattering theory which includes multiple scattering effects. The derived time-reversal MUSIC methods include both interior sampling, as well as exterior sampling (or enclosure) approaches. For presentation simplicity, particular attention is given to the time-harmonic case where the informational wave modes employed for target interrogation are purely spatial, but the corresponding generalization to broadband fields is also given. This paper includes computer simulations illustrating the derived theory and algorithms.
authors: Department of Electrical and Computer Engineering, the Bernard M. Gordon Center for Subsurface Sensing and Imaging Systems (CenSSIS), Northeastern University, Boston, MA 02115, USA.
authors: Edwin A
authors: EA
authors: Marengo
authors: Fred K
authors: FK
authors: Gruber
authors: Francesco
authors: F
authors: Simonetti
mesh_terms: D000162:Acoustics; D000465:Algorithms; D001185:Artificial Intelligence; D004574:Electromagnetic Fields; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity