"C Kingsbury" wrote in message
om...
the idea of cellphone
towers is kind of fascinating. Here you have a bunch of radio
transmitters in highly-fixed geographical locations that squawk a
bunch of info out into the ether (hmm, sounds like a GPS satellite to
me),
If you add precise timing and positional codes to the signal these
towers send out, you could conceivably have a highly GPS-like system
that provides some kind of backup.

CDMA operates on precise timing.

However, they usually get their precise timing from GPS receivers...

Paul