1. Real-Time RFID Localization Using RSS
Kirti Chawla, Christopher McFarland, Gabriel Robins, Connor Shope
Presenter: Christopher McFarland

2. Background The necessity for locating objects
Limitations of current solutions:
Expensive equipment
Nontrivial computational processing
Unrealistic constraints

3. Objective Simple! To locate objects in a given environment
Criteria for a successful system:
Adaptive
Scalable
Accurate
Fast
Realistic

4. Why RFID? Scalable Wide range of environments
Remove unrealistic constraints?
Deliver next generation of localization services

5. Sneak Peek
Our proposed solution
How?

6. A Key Insight
Ideal tag-reader pairs unlock higher performance

7. Performance-Enhancing Heuristics
Real-Time Localization Framework
Tag Selection
Tag Binning
RSS Decay Models
Performance-Enhancing Heuristics
Problem
Brands of tags have variable performance
Solution
Select tag brands based on performance

8. Performance-Enhancing Heuristics
Real-Time Localization Framework
Tag Selection
Tag Binning
RSS Decay Models
Performance-Enhancing Heuristics
Problem
Tags of the same brand have variable sensitivities
Solution
Bin tags based on their sensitivity

9. Performance-Enhancing Heuristics
Real-Time Localization Framework
Tag Selection
Tag Binning
RSS Decay Models
Performance-Enhancing Heuristics
Problems
RF signal variability renders the Friis Eqn. useless
Environmental effects affecting RSS

10. Performance-Enhancing Heuristics
Real-Time Localization Framework
Tag Selection
Tag Binning
RSS Decay Models
Performance-Enhancing Heuristics
Solution
Inspired by the Friis Equation
[ThingMagic, Tag-10]
RSS = D0.29
Friis Eqn.
General Form Eqn.
RSS = CDE
[Alien, Tag-14]
RSS = D-0.89

11. Performance-Enhancing Heuristics
Real-Time Localization Framework
Tag Selection
Tag Binning
RSS Decay Models
Performance-Enhancing Heuristics
Solution
Model RSS decay with respect to tag-reader distance and tag orientation

12. Performance-Enhancing Heuristics
Real-Time Localization Framework
Tag Selection
Tag Binning
RSS Decay Models
Performance-Enhancing Heuristics
Proposed future work
Careful use of reference tags?
Auto-calibration routines
Real-time environmental information
Where we’re currently at

13. Creating a Realistic Deployment
Internet
RFID Reader
Backend Host
Tablet
Mobile Robot with onboard reader and multi-tag
Antenna

14. Some Results Black Actual location Blue
Reported for [ThingMagic, Tag 10]
[0.3—1.2m], 0.75m avg*
Red
Reported for [Alien, Tag 14]
[0—1.14m], 0.57m avg*
*Ranges and averages include outliers

15. Have we met the criteria?
Adaptive
Scalable
Accurate
Fast
Realistic

16. Real-Time RFID Localization Using RSS
Kirti Chawla, Christopher McFarland, Gabriel Robins, Connor Shope
Presenter: Christopher McFarland