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
- 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
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.