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Determining location with diffraction propagation

Determining location with diffraction propagation. Micah Taylor 2008-10-13 http://kixor.net/school/2008fall/comp790/project/. Localization. Localization. Finding location relative to wave source. Localization. Finding location relative to wave source Cell phones. Localization.

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Determining location with diffraction propagation

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  1. Determining location with diffraction propagation Micah Taylor 2008-10-13 http://kixor.net/school/2008fall/comp790/project/

  2. Localization

  3. Localization • Finding location relative to wave source

  4. Localization • Finding location relative to wave source • Cell phones

  5. Localization • Finding location relative to wave source • Cell phones • GPS

  6. Localization • Finding location relative to wave source • Cell phones • GPS • Much work in robotics

  7. Types of propagation

  8. RF propagation • Direct • From source to receiver • Strongest

  9. RF propagation • Direct • From source to listener • Strongest • Reflection • Bounces off things • Multipath

  10. RF propagation • Direct • From source to listener • Strongest • Reflection • Bounces off things • Multipath

  11. RF propagation • Direct • From source to listener • Strongest • Reflection • Bounces off things • Multipath • Diffraction • Travel around buildings • Multipath

  12. Diffraction

  13. Diffraction • Bending around objects

  14. Diffraction • Bending around objects • Allows out of LOS paths

  15. Diffraction • Bending around objects • Allows out of LOS paths

  16. Diffraction • Bending around objects • Allows out of LOS paths • Very important for signalin cities!

  17. Diffraction research

  18. Diffraction research • Huygens’ diffraction

  19. Diffraction research • Huygens’ diffraction

  20. Diffraction research • Huygens’ diffraction • Several models

  21. Diffraction research • Huygens’ diffraction • Several models • Huygens-Kirchhoff • Fresnel • GTD • UTD • BTM

  22. Frustum tracing

  23. Frustum tracing • No complicated wave effects

  24. Frustum tracing • No complicated wave effects • Uses geometry to estimate propagation

  25. Frustum tracing • No complicated wave effects • Uses geometry to estimate propagation • Models propagation

  26. Frustum tracing • No complicated wave effects • Uses geometry to estimate propagation • Models propagation • Stronger in LOS • Bounces

  27. Frustum tracing • No complicated wave effects • Uses geometry to estimate propagation • Models propagation • Stronger in LOS • Bounces • Discrete volumes

  28. Advantages

  29. Advantages • Very fast

  30. Advantages • Very fast • Supports moving objects

  31. Advantages • Very fast • Supports moving objects • Different materials

  32. Advantages • Very fast • Supports moving objects • Different materials • Convincing results

  33. Advantages • Very fast • Supports moving objects • Different materials • Convincing results • Runs on ordinary PC

  34. Other work

  35. Other work • Raytracing

  36. Other work • Raytracing • Dynamic/complex scenes • Slow and aliases

  37. Other work • Raytracing • Dynamic/complex scenes • Slow and aliases

  38. Other work • Raytracing • Dynamic/complex scenes • Slow and aliases • Beam tracing

  39. Other work • Raytracing • Dynamic/complex scenes • Slow and aliases • Beam tracing • Fast without aliasing • Static/simple scenes

  40. Other work • Raytracing • Dynamic/complex scenes • Slow and aliases • Beam tracing • Fast without aliasing • Static/simple scenes

  41. Other work • Raytracing • Dynamic/complex scenes • Slow and aliases • Beam tracing • Fast without aliasing • Static/simple scenes • Frustum tracing

  42. Other work • Raytracing • Dynamic/complex scenes • Slow and aliases • Beam tracing • Fast without aliasing • Static/simple scenes • Frustum tracing • Some aliasing

  43. Goals

  44. Goals • Combine RF diffractionwith frustum tracing

  45. Goals • Combine RF diffractionwith frustum tracing • Find possible paths throughenvironment

  46. Goals • Combine RF diffractionwith frustum tracing • Find possible paths throughenvironment • Attempt localization usingpath attenuation

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