28 Sep
2016
28 Sep
'16
1:54 a.m.
On 27 Sep 2016 16:45:11 -0700 "ikj1234i@yahoo.com [op25-dev]" op25-dev@yahoogroups.com wrote:
That is a very interesting question, there is some margin built in to the timing specs, but it's not clear how much the time difference of arrival would eat into that. It's usually not that common or easy to monitor mobiles directly in UHF/800/900 - the much more common case is to listen to them via the repeater output (downlink) anyway, also TDMA isn't currently used for direct (simplex) mobile/mobile comms.
Wouldn't that make multilateration of P25 phase II handsets impossible, since it's entirely predicated on measuring TDOA? Or is the guard interval sufficiently long enough that it doesn't matter at short distances?
--
Alex