This page last changed on Jan 15, 2007 by stepheneb.

Cell Phone Location Systems

There are several types of location systems built into cell phones.

  • Observed Time Difference of Arrival (OTDOA)
    • Used in 3G networks
    • resolution: 100m
    • low latency
    • available wherever a location-enabled cell signal is available
  • GPS
    • resolution: 1m
    • avaialble outside everywhere – as long as the satellites are not shadowed by buildings, trees, etc
    • low latency except that initial aquisition of the GPS signal can take minutes

External Vendors

  • CPS
    CPS creates chips and software trechnologies that support location services in cell phones. The are planning to create a location system chip with OTDA and GPS capability that will OEM for $1. See: E-GPS.
Document generated by Confluence on Jan 27, 2014 16:56