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Zigbee Localization

calliope avatar
calliope
14 diapositives · 464 Views · Oct 04, 2012

Zigbee Localization. Made By : Pranay Sharma. What is Localisation ??. Dictionary Meaning : “A determination of the place where something is.” OR “Accurately specifying the position of an object within a given Local Area” It can be thought of as a “G.P.S.” at a MICRO Level” .

#ieee 80 #15 2. lateralization #echo sounding #echolocation #lateralisation #laterality #cephalization #emplacement
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Zigbee Localization
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  1. Zigbee Localization Made By : Pranay Sharma

  2. What is Localisation?? • Dictionary Meaning : “A determination of the place where something is.” OR • “Accurately specifying the position of an object within a given Local Area” • It can be thought of as a “G.P.S.” at a MICRO Level”

  3. What is Zigbee?? • A low bandwidth wireless communication technology which consumes very less energy • It is based on the 802.15.4 which is a standard for wireless communication put out by the IEEE

  4. Zigbee + Localization =How?? Step One: Transmission takes place Zigbee 1(Stationary Device) Zigbee 2(Mobile Device) Step Two: The RSSI(receive Signal Strength Indicator) or simply SIGNAL STRENGTHvalue is noted by Zigbee 1 e.g. Let RSSI=23db ~ 1m Radius A Microcontroller then determines from a stored database how much distance is equalent to 23db (a fictious table is shown in the next slide) So the database tells the microcontroller that 23db ~ 1m distance from the stationary

  5. Eg. Of such an equivalency table* *=An assumed table, values are just assumed to explain the point.

  6. So using one Stationary Module and one mobile module an APPROX AREA* can be assumed in which the mobile Zigbee module might be assumed to be LOCATED as shown below.(Refer to the previous figure for Zigbee colour code meaning). 23db ~1m *=The shape assumed here is a circle ,though the real shape of this probabilistic area might not be a circle at all

  7. And by using other techniques or algorithms like triangulation etc ,it should be even possible to find out the position of a mobile Zigbee ( ) sensor ,Though it shall be under the constraint of limited Accuracy.

  8. Why Should I care about Localization!!!

  9. For example, let us analyze the “Fall Detection Device” • What does it Do? • Detects no. of times a person has fallen, sat down, slept/lied down etc • Relays this information through a DDS through an R.F.(or in future Zigbee)

  10. Hmmm….So what…I think its Enough….Is it? • But the Question is ,where did the person Fall?? Or Did he even Fall?? • He could have EVEN just Sunked onto his SOFT Couch!!! • The Device Says that Mr.X slept ??But where ??Is He Sleeping on his bed or Slowly just fallen onto his floor? • Moreover for people with disorders like “Dementia” & “Sleep walking” the question also arises of where are they right now?

  11. USES (Other than medical) • It “probably” might be able to locate people to within a limited area….so?? • Can be used for security purposes as people can be tracked remotely • For children tracking in “Child day care schools” • Asset tracking in Industries. • Robot localization.

  12. Benefiting the Research Ongoing at GRC • Projects that can be enhanced in your lab • Fall Detection Project (Gary) • Tracking of People Moving in a Museum • Child tracking in a play-school. • Robot-Localisaiton.

  13. Current Trends in Localization • Localization has been tried using several methods:- • MIT labs made devices like “Cricket Ultrasonic sensors” for localisation • Company ”Ekahau” uses Wi-Fi devices for localization. • Dep't of Computer Science & Information Engineering, NTU, Taiwan also had similar projects related to localization.

  14. Thank You