What software are you using for the capture? Custom C++? gnuradio? On Wed, Nov 17, 2021 at 4:04 AM 陈煜 <[email protected]> wrote:
> hello, > > I use four usrp-2945 as synchronous acquisition system, CDA-2990 > provides internal reference clock and PPS to four usrp-2945, and pxie-5651 > and pxie-5652 are used to provide two-stage local oscillator for four > USRPs. Now I use two usrp-2945 to collect the data of two channels (one > channel for each) and calculate the phase difference between the two > channels. If I use UHD 4.1.0.1, after multiple acquisition, I find that > there are four kinds of phase differences, and the phase differences are > roughly 90 degrees, 180 degrees and 270 degrees. For example, the four > phase differences are 4.5 degrees, 95.53 degrees, 189.51 degrees and 275.49 > degrees respectively. If I use UHD 3.15.0.0, there is only one phase > difference. > > Setup Details > 1.CDA-2990 provides internal reference clock and PPS to four usrps. > 2.Pxie-5651 and Pxie-5652 are used to provide two-stage local oscillator > for four USRPs. > > Expected Behavior > Using UHD 4.1.0.1, there is only one phase difference. > > Actual Behaviour > There are four phase differences using UHD 4.1.0.1. > > Steps to reproduce the problem > After synchronizing the reference clock, PPS and lo, use UHD 4.1.0.1 to > collect one channel of different USRP and calculate the phase difference. > > can anybody help me? > _______________________________________________ > USRP-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] >
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