On 29/11/2023 06:45, matthew.t.hun...@aero.org wrote:
Hello,
We have an X310 that is connected to a high precision GPSDO 10 MHz
reference and 1 PPS signal.
1.
How precise is the timestamp generated from the 1 PPS signal
(assuming a perfect 1 PPS)?
2.
Is it limited by the master 200 MHz clock to +/- 5 ns? Or the
sample rate?
The time-of-day register updates at the master clock rate, so +/- 5ns.
That's in terms of precision. In terms of
*accuracy*, there may be some latency in "noticing" the 1PPS pulse
when you load in a new clock value. Not
sure what that latency is, but it's likely fairly small (ns-scale).
1.
Is there a way to achieve sub-nanosecond precision?
Not without significant hardware and FPGA modifications on the radio,
and I'm pretty-sure the FPGA can't be run at
clock rates that would allow sub-ns precision.
Thanks
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