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Localization by RFID

Localization by RFID. ref: “LANDMARC: Indoor Location Sensing Using Active RFID”, PerCom’03 by: L. Ni, Y. Liu, Y. C. Lau, and A. P. Patil. Some Thought. Solution 1: deploying many readers Solution 2: deploying many tags. Goal of This Work. goal:

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Localization by RFID

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  1. Localization by RFID ref: “LANDMARC: Indoor Location Sensing Using Active RFID”, PerCom’03 by: L. Ni, Y. Liu, Y. C. Lau, and A. P. Patil

  2. Some Thought • Solution 1: deploying many readers • Solution 2: deploying many tags

  3. Goal of This Work • goal: • few readers and many tags in the environment • user only carries a tag • to investigate whether the RFID technology is suitable for locating objects with accuracy and cost-effectiveness. • LANDMARC: by Active RFID Calibration • for in-building use. • utilizing the concept of reference tags.

  4. LANDMARC Architecture:1. readers2. fixed tags3. tracking tag (carried by user)

  5. LANDMARC Approach (I) • In the sensing field: • n readers • m fixed tags • u tracking tags (attached to a moving object) • Readers are configured with continuous mode. Detection range = 1 ~ 8. • Signal Strength Vector of a tracking tag: S=(S1, S2, …, Sn) • Signal Strength Vector of a fixed tag i: Fi=(θ1, θ2, …, θn)

  6. LANDMARC Approach (II) • Euclidian distance between a tracking tag and the i-th fixed tag: • Location of the tracking tag: • pick the k fixed tags with the smallest “Euclidean distances” • weighted location:

  7. ExperimentEnvironment

  8. Environmental Factors: Daytime vs. Night • Do not see much difference in the overall accuracy.

  9. Effect of n (Number of Readers) • With more RF readers, a better decision can be made.

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