RFID in Indoor Location Sensing

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2 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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RFID in Indoor Location
Sensing

Sucharitha Saibaba

Divya Gopinathan

OBJECTIVE OF THE PROJECT



To understand the working of RFID system.



Program the RFID module using PSoC Designer software.



To read and write data to the tags.



To distinguish between multiple tags when
simultaneously present in the field.



To demonstrate a practical application of the RFID
technology like a small scale Library Management
system.



R
adio
F
requency
Id
entification


The only truly
automatic

AIDC technology




Provides non
-
contact, non
-
line
-
of
-
sight operation




Can be read
-
only, WORM (write once, read


many) or read/write




Very difficult to counterfeit



Capable of working in harsh environments



Highly capable and proven technology for a wide


range of applications

What is RFID?

What Constitutes an RFID System?


One or more RF tags



Two or more antennas



One or more interrogators



One or more host computers



Appropriate software

How Does RFID Work?

Reader

Antenna

Reader broadcasts signal
through antenna

Transponder

Transponder receives signal

Computer
System

Reader sends info/data to
computer system for logging
and processing

Transponder is charged with
enough energy to send back
an identifying response


RFID Tag Attributes

Active RFID

Passive RFID

Tag Power Source

Internal to tag

Energy transferred
using RF from
reader

Tag Battery

Yes

No

Required signal
strength

Very Low

Very High

Range

Up to 100m

Up to 3
-
5m, usually
less

Multi
-
tag reading


1000’s of tags
recognized


up to
100mph

Few hundred within
3m of reader


Data Storage

Up to 128 Kb or
read/ write & search

128 bytes of
read/write

RFID Technical Design
Considerations



Operating Frequency


Available Frequency Bands


RF Signal Propagation (range, reflections, and material
transmittance)


Interference



Communication Signal


Interrogation Signal with request commands and control


Response Signal with unique identification and data



Tag Design


Passive or Active Power


Antenna Design and Performance


Integrated Circuit Design



Reader and Reader Antenna



Networking Requirements



How far? How fast? ….....


RFID Programmer SM2005
-
B5

Main Components of the Project


Cypress PSoC (programmable System
-
on
-
Chip) microcontroller.



This microcontroller comes programmed with a Manchester RF
32/64 signal demodulator and decoder.



The ChipModule has nine general purpose IO pins and about
4KB of flash memory that can be filled with custom built code.



The custom code was written using PSOC Designer.



Loading code is done through RS232C serial interface.

SMRFID GUI


Programming the Microcontroller

Objectives Achieved


The communication is established between the



microcontroller on the chip module and PC.




The individual tags are written into and read.





Distinguish each tag from one another when multiple tags




are present in the RF field.

Future Scope


How this idea can be extended to a real time location system?



The RFID readers can be embedded into the environment and the
RFID tags carried by each user inform the system of the current
location of that user.



RFID tags are embedded into the environment while users carry
RFID readers.


References



www.fiatech.org/Presentations/texasinstruments



www.sonmicro.com



wwwx.cs.unc.edu/~sparkst/mobile/rfid/RFID



www.uhisrc.com/FTB/RFID/RFIDsep03



Blewett,Amin,et al.,”A Simple RF System for Asset Tracking
Within Buildings”, IEE,1999



Thank you!

Questions/Comments/Discussion