Hi Jim,
On 02/27/2016 06:14 PM, jimlux wrote:
On 2/26/16 11:34 PM, Hal Murray wrote:
How many of them came from E-911 stations?
E-911 triangulation done on cell towers …
I was thinking of the stations where they have the dispatchers who
answer the
calls
and pass the info on to the right people. I think they need good
timing on
the recordings, but don't know any details. I've always thought some
of them
used GPS.
They need good time, but probably only to the nearest second.
Phase alignment is relevant for TDMA based systems as well as CDMA based
systems, but for a bit different reasons.
GSM for instance actually have phase requirements, but dodges it by
using one of many options to compensate the phase difference between
different towers.
Cheers,
Magnus
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