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  1. MobiSys 2011 Indoor Location Sensing Using Geo-Magnetism JaewooChung, Matt Donahoe, Chris Schmandt, Ig-Jae Kim, PedramRazavai, MicaelaWiseman -Twohsien 2011.10.31

  2. OUTLINE • Introduction • System overview • Evaluation • Conclusion • Discussion

  3. OUTLINE • Introduction • System overview • Evaluation • Conclusion • Discussion

  4. INTRODUCTION • Disturbance of the Earth’s magnetic field • Steel and concrete skeletons Fingerprint!!

  5. INTRODUCTION • Scope of this work • Characteristics of magnetic field signatures • Performance of positioning system • Reducing outliers

  6. OUTLINE • Introduction • System overview • Evaluation • Conclusion • Discussion

  7. SYSTEM OVERVIEW • The observed characteristics of indoor magnetic fields • E-compass HMC6343 • Stepper motor

  8. SYSTEM OVERVIEW

  9. SYSTEM OVERVIEW • RMS difference

  10. SYSTEM OVERVIEW

  11. SYSTEM OVERVIEW

  12. SYSTEM OVERVIEW

  13. OUTLINE • Introduction • System overview • Evaluation • Conclusion • Discussion

  14. EVALUATION • Wearable device

  15. EVALUATION • Test sites

  16. EVALUATION • Result of performance

  17. EVALUATION • Result of performance

  18. EVALUATION • 75.7% < 1m

  19. EVALUATION • vectors

  20. EVALUATION • Modified algorithm • Varying the search space from the last known position • Filtering the predicted position by adding conditions in our algorithm

  21. EVALUATION

  22. EVALUATION 86% < 1m 88% < 1m

  23. EVALUATION

  24. EVALUATION • Different floor

  25. EVALUATION • Long term performance

  26. EVALUATION • Effects near moving objects

  27. OUTLINE • Introduction • System overview • Evaluation • Conclusion • Discussion

  28. CONCLUSION

  29. OUTLINE • Introduction • System overview • Evaluation • Conclusion • Discussion

  30. DISCUSSION • Advantage: • no infrastructure overhead • Disadvantage: • Outlier could be placed at any location • Error increases with the size of map • Effort and time required