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RollCaller : User-Friendly Indoor Navigation System Using Human-Item Spatial Relation

RollCaller : User-Friendly Indoor Navigation System Using Human-Item Spatial Relation. Yi Guo, Lei Yang, Bowen Li, Tianci Liu, Yunhao Liu Hong Kong University of Science and Technology, Hong Kong y School of Software and TNLIST, Tsinghua University, China. Outline. Motivation

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RollCaller : User-Friendly Indoor Navigation System Using Human-Item Spatial Relation

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  1. RollCaller: User-Friendly Indoor Navigation System Using Human-Item Spatial Relation Yi Guo, Lei Yang, Bowen Li, TianciLiu, YunhaoLiu Hong Kong University of Science and Technology, Hong Kong y School of Software and TNLIST, Tsinghua University, China

  2. Outline Motivation Our observation: Human-Item Spatial Relation System design: User-Friendly Indoor Navigation Implementation and Evaluation

  3. Motivation When we are searching something in libraries or supermarkets…

  4. Motivation Items are now tagged with RFID tags

  5. Motivation Items are now tagged with RFID tags Using existing RFID localization method is ok but wasteful

  6. Motivation • Items are now tagged with RFID tags • Using existing RFID localization method is ok but wasteful • Need to locate the user and desired item separately • Not accurate enough to be aware when the user is right near the desired item • Noisy and volatile environment

  7. Motivation • Items are now tagged with RFID tags • Using existing RFID localization method is ok but wasteful • Need to locate the user and desired item separately • Not accurate enough to be aware when the user is right near the desired item • Noisy and volatile environment

  8. Methodology • Recall the difficulties using existing RFID localization: • Need to locate the user and desired item separately • Finding the spatial relation between the user and the item instead of finding their global cords • Human-Item Spatial Relation

  9. Methodology • Recall the difficulties using existing RFID localization: • Need to locate the user and desired item separately • Finding the spatial relation between the user and the item instead of finding their global cords • Human-Item Spatial Relation • Not accurate enough to be aware when the user is right near the desired item • Should be aware when the user is right near the desired item

  10. Methodology • Recall the difficulties using existing RFID localization: • Need to locate the user and desired item separately • Finding the spatial relation between the user and the item instead of finding their global cords • Human-Item Spatial Relation • Not accurate enough to be aware when the user is right near the desired item • Should be aware when the user is right near the desired item • Noisy and volatile environment • The characteristics we utilize should be environment insensitive

  11. Doppler Frequency Shift in RFID • Definition: • The frequency change of the received reader carrier signal due to relative motion between the transmitter (RFID tag or the attached object) and the receiver (reader antenna)

  12. Doppler Frequency Shift in RFID • Definition: • The frequency change of the received reader carrier signal due to relative motion between the transmitter (RFID tag or the attached object) and the receiver (reader antenna) • How Impinj reader measures Doppler frequency shift

  13. Observation: human impact Noise

  14. Observation: human impact Noise

  15. Observation: human impact

  16. Observation: human impact

  17. Analysis

  18. Analysis Noise Stage

  19. Analysis Noise Stage Peak Stage

  20. Human-Item Spatial Relation • How to describe Human-Item Spatial Relation? • Anchor Time Stamp

  21. System Design: RollCaller

  22. System Design: RollCaller

  23. System Design: RollCaller

  24. System Design: RollCaller

  25. Implementation Impinj Speedway Revolution RFID Reader loaded with software version Octane 4.8 4 directional reader antennas

  26. Evaluation: Human-Item Spatial Relation Accuracy of Anchor Time Stamp

  27. Evaluation: User-Friendly Navigation System Performance of Reader Antenna Relation Map Generation

  28. Evaluation: User-Friendly Navigation System Performance of User Navigation Service

  29. Evaluation: User-Friendly Navigation System Performance of User Navigation Service (cont.)

  30. Conclusion • A novel approach is proposed to depict the spatial relation between user and item using Doppler frequency shift in RFID system. • A user-friendly indoor navigation system is designed based on the human-item spatial relation • Further works • Multi-user scenario • Real-world deployment

  31. THANK YOU!! Questions?

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