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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

TV-GPS

Enhancing

Global Positioning Systems

Using Television Signals

By Chris Lehnert

overview
Overview
  • Introduction
  • Dissecting the Signal
  • Positioning
  • Conclusions
  • Resources
introduction
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
introduction1
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
dissecting the signal
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
dissecting the signal1
Dissecting the Signal
  • Downconverting TV signal process:
      • Assume nominal offset frequency
      • Sample the frequency
      • Create complex code signal
      • Compute Fourier Transform
positioning
Positioning
  • Device acquires signal
  • Triangulates latitude and longitude
      • Pseudoranges
  • Monitor unit tracks signals
      • No common clocks
  • Location server does computations
      • Sends data to chips
positioning2
Positioning
  • Message flow diagram
conclusions
Conclusions
  • Positive:
      • Excellent positioning system when paired with conventional GPS
      • Robust, high speed, large coverage
      • Many practical uses
  • Negative:
      • Location privacy
resources
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