Hey Daniele, I have done the radar toolbox and implemented a synced USRP interface (USRP Echotimer).
You are right, the USRP Echotimer does align the timestamps of the TX/RX commands on both USRPs. But if you connect them by MIMO, the time and clock are pretty good in sync. Therefore I think the Echotimer can provide a sync with an accuracy of at least +- 1 sample. Check out [0] for a video of the sync. There is also a sync setup for testing (gr-radar/examples/usrp). Unfortunately the documentation is not finished yet. But care: The Echotimer bursts only a packet in sync, it does not stream the whole time! The packet is defined by a tagged stream. Greetings, Stefan [0] https://grradar.wordpress.com/2014/06/17/synchronisation-echotimer-usrp-interface/ Am 22.07.2014 18:40, schrieb Daniele Nicolodi: > On 22/07/2014 18:18, Martin Braun wrote: >> On top of what Marcus' has said, >> >> the gr-radar toolbox might be helpful. It has a block that takes a >> tagged stream, and outputs a signal it acquired synchronously to the >> transmitted one. > > Thanks Martin. This seems to imply that there is no way to actually > synchronize the hardware, and that the synchronization can only be done > in software aligning the timestamps of the two streams. Is that the case? > > Thanks. Cheers, > Daniele > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
