On 2022-05-11 09:18, Marcin Puchlik wrote:
Marcus,
Thank you very much for the answer. Does it mean that 1 PPS signal is
optional? Can I only provide an external 10 MHz clock without 1 PPS?
*Z poważaniem *
*Marcin Puchlik*
*Yes, absolutely. If timestamp synchronization is not important to you,
then you can just provide a 10MHz reference when you want better
frequency accuracy and drift characteristics than are offered by the
on-board clock and/or you want some type of phase-synchronization
but don't care much about mutual phase offsets....
*
śr., 11 maj 2022 o 14:24 Marcus D. Leech <patchvonbr...@gmail.com>
napisał(a):
On 2022-05-11 06:17, Marcin Puchlik wrote:
Hello Community,
Like in the topic, I know that a stable 10 MHz source is needed
as a clock signal but why do we need 1 PPS signal? How is it used
by the USRP hardware? Can someone explain that to me?
Thanks
Marcin
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1PPS is used to provide timestamp-clock synchronization across
multiple devices, typically. This is important when your
application requires this, such as in MIMO or
multi-receiver TDOA schemes, etc.
Basically, when you have multiple devices you use
set_time_unknown_pps() or set_time_next_pps() to signal to all
devices in your multi_usrp object that at the next
1PPS, to set the timestamp clock to the value given in the the
API call.
This turns out to be useful even in single devices that are
"bicameral", such as B210 and X310, where there are (for historic
and architectural reasons)
TWO timestamp clocks. Use the 1PPS synchronization primitives
causes the internal timestamp clocks to become synchronized.
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