I appreciate the information and advice you have shared and sincerely thank you for the assistance.
On Sun, Aug 13, 2023 at 8:15 AM Marcus D. Leech <patchvonbr...@gmail.com> wrote: > On 13/08/2023 00:36, Ali G. Dezfuli wrote: > > Hi all, > > I'd like to measure the round-trip delay (RTD) between two B200 USRPs. > > For that, I send a raised-cosined-filtered, BPSK modulated > > PN-sequence, and as soon as > > I get this signal at the receiver, send back the same sequence from > > the Rx to the Tx, and by correlation, I find the RTD. > > The question is that the measured RTD is not fixed. I wonder how can I > > make it fixed when the distance between the two USRPs is fixed. > > After that (A -> B -> A) I want to do that in reverse order (B -> A -> > > B) and expect to have the same RTD. > > Thanks > In your scenario, the latency will necessarily be variable--after all > your samples are entering a computer program where those > samples are processed and then sent back in the other direction. > Since computer software on a general-purpose operating > system cannot have fixed latency at fine-grained levels, this is > completely expected. > > This document may help: > > https://kb.ettus.com/Synchronizing_USRP_Events_Using_Timed_Commands_in_UHD > > > >
