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Time-reversal and MUSIC

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  1. Time-reversal and MUSIC Anthony J. Devaney Department of Electrical and Computer Engineering Northeastern University Boston, MA 02115 email: tonydev2@aol.com Review of time-reversal Discussion of Vector Spaces Incorporation of MUSIC Computer Simulations A.J. Devaney Stanford Lecture III

  2. System Configuration Antenna element Point Scatterers Assumes Born Approximation Antenna Array A.J. Devaney Stanford Lecture III

  3. Incident Wavefield A.J. Devaney Stanford Lecture III

  4. Scattered Wavefield--Born A.J. Devaney Stanford Lecture III

  5. Receive Voltage A.J. Devaney Stanford Lecture III

  6. Time-Reversal Matrix A.J. Devaney Stanford Lecture III

  7. Array Point Spread Function Backpropagated field from scatterer located at Xm’ evaluated at field location r A.J. Devaney Stanford Lecture III

  8. Well-resolved Targets Backpropagated field from scatterer located at Xm’ vanishes at all other scatterer locations A.J. Devaney Stanford Lecture III

  9. Vector Spaces for W.R.T. Noise Subspace Signal Subspace A.J. Devaney Stanford Lecture III

  10. Focusing with Time-reversal A.J. Devaney Stanford Lecture III

  11. Focused versus time-reversed fields A.J. Devaney Stanford Lecture III

  12. Non-well Resolved Targets A.J. Devaney Stanford Lecture III

  13. MUSIC Pseudo-Spectrum A.J. Devaney Stanford Lecture III

  14. Computer Simulation • Future Directions • Extended Objects • Random Media • Sparse Arrays A.J. Devaney Stanford Lecture III

  15. Pseudo-spectrums A.J. Devaney Stanford Lecture III

  16. Contour plots of Pseudo-spectrums A.J. Devaney Stanford Lecture III