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Preliminary Study of Indoor Ultrawideband Localization for At-Home Patient Monitoring

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Preliminary Study of Indoor Ultrawideband Localization for At-Home Patient Monitoring

  1. 1. Preliminary Study of Indoor UWB Localization for At-Home Patient Monitoring<br />AMA-EMBS IEEE Conference<br />Washington D.C<br />March 22~23, 2010<br />Oregon State University <br />Oregon Health and Science University<br />
  2. 2. At-Home Patient tracking and Indoor localization<br /><ul><li> Purpose of this work
  3. 3. Monitor two patients’ movement simultaneously in home area
  4. 4. Expectations
  5. 5. Continuous medical service</li></ul> for at-home patients<br /><ul><li> Monitor patients’ safety effectively </li></ul> by nurses or doctors who are not <br /> in the same place with patients<br /><ul><li> Indoor localization
  6. 6. Conventional : RSSI, AOA, etc.
  7. 7. UWB TDOA technology has</li></ul> been employed for our system<br />Figure.1 Off-site staff can remotely monitor patients’ safety.<br />
  8. 8. UWB TDOA technology for indoor localization<br /><ul><li> Properties of UWB signal
  9. 9. Fine time resolution of UWB signal pulse width IR-UWB signal
  10. 10. Persistence of multiple reflection Robustness in indoor environment
  11. 11. Carrierless transmission  Hardware simplicity
  12. 12. Time Difference of Arrival(TDOA) technology
  13. 13. Define the hyperbola with foci at the location of receivers.</li></ul> TDOAR1,R2=(S2-S1)/c , where c is speed of light<br /><ul><li> Three receivers make one crossing point</li></ul> 3 is the minimum number of receivers for 2-D estimation<br /> and 4 receivers are needed for 3-D localization.<br />The most proper technique for <br />indoor localization and patient tracking system<br />
  14. 14. Fabricated UWB transceiver<br />2mm<br />1mm<br /><ul><li> IR-UWB Transceiver
  15. 15. 90nm-CMOS, 500Mbps, fully-integrated
  16. 16. Transmitter equalization (Plots in receiver)</li></ul>< Received signal without equalization><br />< Received signal with equalization><br />< 2mm2 IR-UWB Transceiver built in 90nm-CMOS ><br /> For our system, only transmitter has been used.<br /><ul><li> Frequency tunable transmitter
  17. 17. Two Tx’s have different frequency bands</li></ul> 3.1~4GHz and 4.1~5GHz for tracking two persons<br />< Transmitting Signal><br />
  18. 18. Experiment environment and results<br /><ul><li> Experiments
  19. 19. Point-of-Care lab at Oregon Health and Science University
  20. 20. Frequency division for 2 transmitters
  21. 21. 4 receivers connect to a sampling scope via cable(Receiver synchronized)
  22. 22. Computer processes the sampled data using Matlab
  23. 23. Results
  24. 24. The locations of two transmitters(patients) can be estimated </li></ul> simultaneously in every 1.3 ~ 1.5(s).<br /><ul><li> From 60 measurements, </li></ul>Unit : cm<br />
  25. 25. Discussion and Future works<br /><ul><li> System improvements
  26. 26. Higher accuracy than existing other system</li></ul> few tens of centimeter (even a few meter)-> less than 10cm error<br /><ul><li> low cost and easy-applicable form-factor</li></ul> low power consumption , 2mm2 chip in transceiver board<br /><ul><li> Entire system will be able to work wirelessly
  27. 27. Get rid of cables connecting receivers with a sampling scope </li></ul> Receiver synchronization issue has to be resolved <br /><ul><li> Estimation updating speed will be faster than wired system</li></ul> Sampling scope spend most of time to capture the signal and <br /> to transfer it to computer<br />Thank you!<br />

Hinweis der Redaktion

  • Hello, my name is SeungjinBaek. The topic of this presentation is “Preliminary study of indoor UWB localization for at-home patient monitoring. Our group is with Oregon State University and Oregon Health and Science University.

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