Some Facts about Cricket Tracking System.

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Some Facts about Cricket Tracking System.

• Vinay Kumar Singh
• Dongseo University

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Outline

• Introduction.
• Cricket unit .
• Software Structure.
• Some Facts.
• Serial id, Space id.
• Indoor system.
• Conclusion
• References.

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Introduction

• Cricket system require the processing to be done
  on a Handheld,PC,Laptop.
• It also uses the TCP/IP protocol to transmit the
  information to the base station.
• The base station further can provide this
  information using internet to many users.
• This system is a hybrid system used active and
  passive tracking system both.
• The cricket hardware unit is same for listener
  and as well as beacon.

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Cricket Unit
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Diagnostic LEDs
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Software Package

• Cricket Platform
• The Cricket platform contains all the software
  differences that handle the differences between
  the Cricket hardware and the Mica2 hardware.
• Cricket Application
• The Cricket application is the software that
  incorporates the beacon and listener algorithms.
• Cricket d software is used to process the
  distance information either on handheld or either
  Laptop.

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Software Architecture
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Cricketd Software

• Cricketd
• This software runs on the listener cricket unit
  via serial port.
• It is a daemon used to access the command
  interface over the network.
• It supports multiple TCP clients and can provide
  location information to more than one
  application.
• The API can be used the same way as with
  HyperTerminal or minicom.

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Input and output command

• GET (G) returns the values corresponding to the
  parameters specified in the command.
• PUT (P) sets the value of the specified
  parameter to the specified command argument.

Cricket Beacon Format
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Command Syntax

• ltdirectivegt ltcommandgt ltparametersgt.
• ltdirectivegt The character G or P for get or
  put.
• ltcommandgt One of the commands from the command
  column .
• ltparametersgt The argument's to the command.
• ltcommandgtltresultgt
• Example( To make the cricket unit work as a
  beacon)
• P MD 1ltreturngt
• Result
• MD BEACON

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Get/Put space ID

• The space ID is an 8-byte string that can provide
  more information about a beacon.
• The space ID has to be set by the user at least
  once to have a value different from NULL.
• Example (set space ID to MIT-6)
• P SP MIT-6ltreturngt
• Result
• SP MIT-6

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Serial ID

• It is a 64 bit number.
• It is fixed for a cricket unit just like MAC
  address.
• it is taken from a serial number DS204 chip on
  the cricket node.
• ID 8123a134014312e3

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Default Parameter of the cricket Unit
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Algorithm Used For distance Calculation

• Triangulation
• Kalman Filter approach.
• Kalman filter approach is used to increase the
  accuracy of the system as by using this system we
  can predict the position of the target based on
  previous measurements.

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Hybrid Archicture.
EKF ---gtExtended Kalman Filter
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Indoor Tracking System
Target
RS-232 Comm.
Wi-Fi
HANDHELD Devices or Laptop etc.
Base Station
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Indoor Tracking System (Our system)
Target
Expansion Board
RF
Base Station
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User getting the information in PDA
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Experimental setup
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Some Points to be noted.

• The location of the cricket nodes in the ceilings
  should not be either on the square and also in
  one circle.
• The computation is done either on the computer or
  with the handheld connected to the listener.
• They use the current TCP/IP network for
  collecting the data at the base station.
• This is a hybrid system some times acts as a
  passive and some time active for reducing the
  error.

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Challenges

• If wanted to reduce the computation than we have
  to make changes in the algorithm used.
• For making the algorithm suitable for mote, it
  may provide some constrain like computation and
  power.
• The system used at least 4 cricket unit installed
  in the ceilings in a room.
• Accuracy depends on the speed by which user is
  moving.
• Not provide information about orientation of the
  user.

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Solution

• Replace the processing from PDA to sensor node.
• If processing occur on the Mote than we can
  easily send the message to the base station using
  the hop communication via sensor node.
• For orientation information we have to used the
  cricket compass system.
• For person tracking system the speed is less so
  the accuracy is good .

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Conclusion

• We can make the changes in the cricket software
  because it is written in Tiny OS.
• Hybrid system approach provide the good accuracy
  on the variable speed of the target.
• Next time i will explain the design of our
  location tracking system using the cricket
  concept.

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References

• Adam Smith, Hari Balakrishnan, Michel Goraczko,
  Nissanka Priyantha,Tracking Moving Devices with
  the Cricket Location System, Proc. 2nd USENIX/ACM
  MOBISYS Conf., Boston, MA, June 2004.
• Cricket v2 User Manual, July 2004
• Hari Balakrishnan, Roshan Baliga, Dorothy Curtis,
  Michel Goraczko, Allen Miu, Nissanka B.
  Priyantha, Adam Smith, Ken Steele, Seth Teller,
  Kevin Wang, Lessons from Developing and Deploying
  the Cricket Indoor Location System, November
  2003. (Preprint.)
• The Cricket Indoor Location System by Nissanka
  Bodhi Priyantha
• MIT PhD. Thesis June 2005