Integration of Positioning Capabilities into an existing active RFID System

1
Integration of Positioning Capabilities into an
existing active RFID System

• Andreas Franz
• Wolfgang John
• Philipp Nagele
• Supervisor Per-Arne Wiberg
• Halmstad, 4th June 2004

2
Overview

• General apsects
• Project objectives
• System concept
• Positioning algorithm
• Simulation results
• Use case

3
Project Objective

• Enhancing the existing RFID system with
  positioning functionalities
• Designing a concept for
• an indoor communication protocol
• a positioning algorithm on a central back-end
  system
• Implementing the proposed algorithm
• Proving the feasibility by simulations
• Analysing system characteristics

4
System Components

• Tag
• saves received angular data (AoA)
• Reader
• collects data from tags
• forwards data to the backend system
• Directional Unit (DU)
• provides angular information (AoA)
• Backend system (PC)
• computes positioning algorithm

5
Communication Protocol
DU 1
f
DU 2
85
225
Reader
2
1
t
Tag Memory DU 1 85 1 DU 2
225 2
280
45
DU 4
DU 3
Backend system
6
Communication Protocol
DU 1
f
DU 2
86
226
Reader
4
3
2
1
t
Tag Memory DU 1 85 1 DU 2
225 2 DU 3 46 3
281
46
DU 4
DU 3
Backend system
7
Communication Protocol
DU 1
f
DU 2
87
227
Reader
4
3
2
1
5
6
t
Tag Memory DU 1 85 1 DU 2
225 2 DU 3 46 3 DU 2
227 6
282
DU 4
47
DU 3
Backend system
8
Communication Protocol
DU 1
f
DU 2
88
228
Reader
4
3
2
1
5
6
7
8
t
Tag Memory DU 1 85 1 DU 2
225 2 DU 3 46 3 DU 2
227 6 DU 3 48 7 DU 4
283 8
283
DU 4
48
DU 3
Backend system
9
Positioning Algorithm
10
Example
11
Simulation of the Protocol

• Communication protocol modelled in Matlab
• Modular design
• Free DU placement
• Variable multipath and propagation effects
• Adjustable system parameters
• Optimisation of system parameters
• Power consumption
• Memory considerations

12
Use Case

13
Use Case
14
Use Case
15
Conclusion

• Positioning achieved with minor hardware
  adaptations
• Implementation of a positioning algorithm
• Plausibility weighting
• High scalability due to flexible DU placement
• Promising accuracy results for a future
  experimental setup

16

• Thank you for your attention!