Eladio Martin - Presentation at Emerging Communications Conference & Awards (eComm 2011)

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Please see blog http://blog.eComm.ec

Please see blog http://blog.eComm.ec

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Transcript

  • 1.
  • 2. eComm 2011, San Francisco Alternatives to GPS for Localization Leveraging Smart Phones. June 29th 2011
    Slide 2 of 16
  • 3. Location Applications
    Monitoring
    Tracking
    Assisted Living
    Targeted advertising
    Social Networking
    • 10% of all the iPhone applications employ location information
    • 4. A quarter of all USA wireless phone users have utilized LBS
    Slide 3 of 16
  • 5. Satellite Navigation Systems
    USA: GPS
    European Union: Galileo (2014)
    € 5.3 billion
    Russia: GLONNAS (2011)
    Most expensive project in Russian Federal Space Agency
    China: Compass (2020)
    • Other regional satellite-based systems:
    • 6. France: Doris
    • 7. India: IRNSS (2014)
    • 8. Japan: QZSS (2013)
    Slide 4 of 16
  • 9. GPS Accuracy ~ 6 meters
    GPS errors’ sources:
    Ionospheric effects (±5meters),
    Shifts in the satellite orbits (±2.5 meters),
    Satellite clock errors (±2 meters),
    Multipath effects (±1 meters),
    Tropospheric effects (±0.5 meters),
    Calculation and rounding errors (±1 meters)
    Slide 5 of 16
  • 10. Main Drawbacks of Satellite Systems
    Slide 6 of 16
  • 12. Satellite Navigation Systems
    USA: GPS
    European Union: Galileo (2014)
    € 5.3 billion
    Russia: GLONNAS (2011)
    Most expensive project in Russian Federal Space Agency
    China: Compass (2020)
    • Other regional satellite-based systems:
    • 13. France: Doris
    • 14. India: IRNSS (2014)
    • 15. Japan: QZSS (2013)
    Slide 7 of 16
  • 16. Alternatives to GPS
    • High Sensitivity GPS
    Advanced signal processing techniques.
    • Low accuracy
    • 17. Inertial Navigation Units (acc + gyro)
    • 18. Very expensive.
    • 19. Radio Fingerprinting
    Slide 8 of 16
  • 20. WiFi Fingerprinting in the iPhone
    Slide 9 of 40
  • 21. Outdoor WiFi Fingerprinting in Smart Phones
    • Accuracy depends on density of Access Points
    Typical error: 50 meters.
    • Example: WiFi-based Localization by Google
    Slide 10 of 16
  • 22. Radio Fingerprinting
    Slide 11 of 40
  • 23. Cellular Fingerprinting
    • Existing systems need Dedicated Hardware
    • 24. Smart Phones:
    • 25. Granularity is poor and Hardware dependent
    • 26. Slow refreshing rate
    • 27. Only RSSI information from the same SIM card operator
    Slide 12 of 16
  • 28. Fingerprinting with other Technologies
    Slide 13 of 16
  • 38. State-of-Art in WiFi Fingerprinting
    • Radar, by Microsoft
    • 39. Accuracy 2 – 3 meters
    • 40. Dedicated Hardware
    • 41. Ekahau
    • 42. Accuracy 1 – 3 meters
    • 43. Dedicated Hardware
    Slide 14 of 16
  • 44. Improvements that Smart Phones can bring to Fingerprinting
    • Integrate both the online and offline phases in fingerprinting
    • 45. Avoid errors due to differences in antenna characteristics and measurement schemes between different equipments
    • 46. e.g. 10 dB between Dell Latitude laptop and Motorola Droid phone
    • 47. Leverage accelerometer (gravity vector) and magnetometer (orientation)
    • 48. Orientation of phone helps enhance the localization accuracy
    Slide 15 of 16
  • 49. WiFi Fingerprinting with Smart Phones
    Slide 16 of 40
  • 50. Stride Length Estimation with Wavelet
    Slide 17 of 40