Presentation describes the contrast between low-power, long-range and precise (vs accurate) localization

1. Low-Power, Long-Range, Precise
Localization
Nextech 2014, Rome - 28 August 2014
Prof. Maarten Weyn
maarten.weyn@uantwerpen.be

2. Research: Maarten Weyn
I Localization: from Opportunistic to Just Enough
I Low-power communication
I Low-power

3. rmware development
I Simultaneous Localization and Mapping
Courses:
I Mobile Communication
I Digital Communication
I Real-Time Localization Systems (Eng)
I Ambient Intelligence (Eng): interaction between low-power
communication, sensors, actuators, low-power hardware and
algorithms
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4. What I'm not going to do...
I No sales talk
I No academic formula's and equations
I No futuristic foresights
I No "You should's"
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5. Low-Power, Long-Range, Precise Localization
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6. Power
Budget
Range
Accuracy/Precision
Responsiveness
Tag Size
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7. Power
Budget
Range
Accuracy/Precision
Responsiveness
Tag Size
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8. Power
Budget
Range
Accuracy/Precision
Responsiveness
Tag Size
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9. Power Budget
Low Power?:
I LG Nexus 5: 2300 mAh / day ?!!!
I Raspberry pi: 500 mAh
I TelosB
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10. Power Budget
Low Power?:
I LG Nexus 5: 2300 mAh / day ?!!!
I Raspberry pi: 500 mAh
I TelosB
Application Driven:
I e.g.: 1 year on coin cell (220 mAh)
I e.g.: "the lifetime of the bird and
weight 1 gram
I e.g.: 2 year on 1/2 AA 3.6V battery
(1100 mAh) ! 62Ah=day
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11. Power Consumption: e.g. BLE
I 3 x 12.8 mA x 660 s (0
dBm)
I 0.00704 Ah / beacon
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12. Power Consumption: e.g. BLE
I 3 x 12.8 mA x 660 s (0
dBm)
I 0.00704 Ah / beacon
I iBeacon: 10 msg/s
I ! 253.44 Ah
! 1 month with a coincell battery
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13. Accuracy vs Precision
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14. Accuracy vs Precision
Source: Versus Technology, Inc.
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15. Range
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16. Range
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17. Range
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18. Techniques
I Signal Strength:
I Attenuation
I Pattern Matching (Fingerprinting)
I Presence / Proximity
I Time (Ranging):
I Time of Flight - Time Dierence of Arrival
I Round Trip Time
I Direction Finding / Angle of Arrival
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19. Signal Strength
RSSd = PrdBm = 10 log Pr (d0) 10np log
d
d0
+ X
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20. Attenuation
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21. Attenuation
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22. Attenuation
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23. Pattern Matching
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24. Presence Detection
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25. Time of Flight: Time Dierence of Arrival
TDOAB-A
TDOAC-A
A B
C
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26. Time of Flight: Round Trip Time
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27. Time of Flight: Cramer Rao Bound
2
^r
c2
42B2Es
N0
Source: Lanzisera et al.: Radio Frequency Time-of-Flight Distance Measurement
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28. Direction Finding
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29. Direction Finding
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30. Power
Budget
Range
Accuracy/Precision
Responsiveness
Tag Size
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31. 28

32. DASH7
Active RFID Standard for 433 MHz.
I Build on top of asynchronous WSN MAC.
I High level functionality optimized for RFID.
I De

33. nes full functional RFID tag.
I Can be extended to non RFID applications.
Supports Tag to Tag communication.
DASH7 Alliance Protocol is designed to support

34. xed and mobile
nodes that need to upload or retrieve small chunks of information
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35. DASH7
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36. DASH7
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37. DASH7
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38. Open Source Stack for DASH7
http://oss-7.cosys.be
LGPL v2.1
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39. Open Source Stack for DASH7
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40. Localization Benchmarking
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41. RF-based Ratlsam
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42. Questions?
maarten.weyn@uantwerpen.be
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