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Radar Physics EE880 Synthetic Aperture Radar

Radar Physics EE880 Synthetic Aperture Radar. M. A. Saville , PhD, PE Summer, 2012. Lesson Overview. Electromagnetic plane wave Space-time relationships Propagation constant Polarization Radar cross-section and coefficient Other effects Summary. Electromagnetic plane wave.

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Radar Physics EE880 Synthetic Aperture Radar

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  1. Radar PhysicsEE880 Synthetic Aperture Radar M. A. Saville, PhD, PE Summer, 2012

  2. Lesson Overview • Electromagnetic plane wave • Space-time relationships • Propagation constant • Polarization • Radar cross-section and coefficient • Other effects • Summary

  3. Electromagnetic plane wave • Wave behavior described by the Maxwell equations 2D Cylindrical wave (water wave) wave solution 3D Spherical wave

  4. Electromagnetic plane wave Solution of a short dipole antenna In the far field, the radial component is much weaker Far field

  5. Polarization

  6. EM plane wave summary • EM plane waves are easy to model • Represents essential radar physics (wave propagation, time-shift, frequency/phase shift, amplitude scaling) • Polarization is also succinctly represented with plane wave model

  7. Radar Cross-Section [Lynch] Conventional aircraft RCS Stealth aircraft RCS

  8. Back-scatter coefficient and RCS Normalized cross-section coefficient Graphics from Stimson

  9. Back-scatter coefficient [Lynch]

  10. Doppler & Apparent Radial Velocity

  11. Atmospheric Loss [Lynch]

  12. Summary of SAR Image • EM plane waves • Radar cross-section • Atmospheric loss

  13. Lesson References • [Stimson] G. Stimson, Introduction to Airborne Radar, SciTech Publishing Inc., 1998. • [Sullivan] R. Sullivan, Foundations for Imaging and Advanced Concepts, SciTech Publishing Inc., 2004. • [Quegan] O. Quegan, Understanding SAR Imagery, SciTech Publishing Inc., 2004. • [Lynch] D. Lynch, Introduction to RF Stealth, SciTech Publishing, Inc., 2004.

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