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TV-GPS

TV-GPS. Enhancing Global Positioning Systems Using Television Signals By Chris Lehnert. Overview. Introduction Dissecting the Signal Positioning Conclusions Resources. Introduction. What is TV-GPS?

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TV-GPS

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  1. TV-GPS Enhancing Global Positioning Systems Using Television Signals By Chris Lehnert

  2. Overview • Introduction • Dissecting the Signal • Positioning • Conclusions • Resources

  3. Introduction • What is TV-GPS? • Positioning using synchronization signals that are broadcast by VHF and UHF frequencies • Why use TV transmitters? • Higher power transmitters • Lower broadcast frequency • Number of different signals • Higher bandwidth

  4. Introduction • Benefits • Compliments conventional GPS • Not affected by: • transmitter Doppler • ionospheric propagation delays • data that is modulated into other signals • Low Horizontal Dilution of Precision (HDOP) • Superior triangulation of lateral positions • More accurate, reliable and rapid positioning

  5. Dissecting the Signal • Focus on American Standards Television Committee (ASTC) • Frame: 626 segments, 832 symbols each • Segment: 4 symbols for synchronization • Segment types: Field Synchronization, Data

  6. Dissecting the Signal • Downconverting TV signal process: • Assume nominal offset frequency • Sample the frequency • Create complex code signal • Compute Fourier Transform

  7. Positioning • Device acquires signal • Triangulates latitude and longitude • Pseudoranges • Monitor unit tracks signals • No common clocks • Location server does computations • Sends data to chips

  8. Positioning

  9. Positioning • Message flow diagram

  10. Conclusions • Positive: • Excellent positioning system when paired with conventional GPS • Robust, high speed, large coverage • Many practical uses • Negative: • Location privacy

  11. Resources • A New Positioning System Using Television Synchronization Signals. Matthew Rabinowitz, James Spilker. ROSUM • http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=180165 • http://www.pcworld.com/news/article/0,aid,118031,00.asp • http://www.directionsmag.com/press.releases/index.php?duty=Show&id=11394&trv=1 • http://www.dailywireless.org/modules.php?name=News&file=article&sid=782 • http://www.fcw.com/article88942-05-23-05-Print • http://fleetowner.com/information_technology/patentpending/fleet_tvgps/ • http://www.rosum.com/rosum_tv-gps_plus_indoor_location_technology.html • http://www.popsci.com/popsci/computerselec/7a924c3ee4d05010vgnvcm1000004eecbccdrcrd.html • http://www.wipo.int/cgi-pct/guest/getbykey5?KEY=01/43428.010614&ELEMENT_SET=DECL • http://www.embeddedstar.com/press/content/2003/2/embedded7435.html • http://en.wikipedia.org/wiki/Pseudorange

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