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RE: [Discuss-gnuradio] USRP2 PPS and REF
From: |
Newman, Timothy |
Subject: |
RE: [Discuss-gnuradio] USRP2 PPS and REF |
Date: |
Fri, 13 Feb 2009 14:04:46 -0500 |
Couldn't you just tell the USRP's to start at a specific time to get
them to start in sync? Rather than in real-time telling them to start
immediately and having that lag.
Tim
-------------------------------------------
Timothy R. Newman, Ph.D.
Wireless @ Virginia Tech
447 Durham Hall
Blacksburg, VA 24061
Phone: 540-231-2041
> -----Original Message-----
> From: address@hidden
[mailto:discuss-gnuradio-
> address@hidden On Behalf Of Douglas Geiger
> Sent: Friday, February 13, 2009 2:02 PM
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] USRP2 PPS and REF
>
>
> Ok - so I have packets coming in from both USRP2's now, getting
dumped
> to their separate files.
> My app prints out the timestamp of each frame that gets sent to the
> copy handler: if my 1PPS source is working properly, should the
> timestamps coming out of the two USRP2's be identical?
> Another question: no matter what, there is going to be some time
delay
> between when I tell one USRP2 to start, and when I tell the other one
to
> start: with the timestamps I could do something like
> align_on_samplenumbers (but with the timestamps - at least I could do
> this in the copy handler where I have access to this information). Of
> course this requires that the timestamps do end up being based on the
> 1PPS. Should I take that as a sign my USRP2's are not currently
getting
> sync'd to the 1PPS?
> Thanks,
> Doug
>
> --
> Doug Geiger
> Research Assistant
> Communications and Signal Processing Lab
> Oklahoma State University
> http://cspl.okstate.edu
> address@hidden
> address@hidden
>
>
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- [Discuss-gnuradio] USRP2 PPS and REF, Suprin, Charles E., 2009/02/09
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Eric Blossom, 2009/02/09
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Douglas Geiger, 2009/02/10
- RE: [Discuss-gnuradio] USRP2 PPS and REF, Suprin, Charles E., 2009/02/10
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Eric Blossom, 2009/02/10
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Douglas Geiger, 2009/02/10
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Douglas Geiger, 2009/02/10
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Johnathan Corgan, 2009/02/10
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Douglas Geiger, 2009/02/12
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Douglas Geiger, 2009/02/13
- RE: [Discuss-gnuradio] USRP2 PPS and REF,
Newman, Timothy <=
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Matt Ettus, 2009/02/13
- RE: [Discuss-gnuradio] USRP2 PPS and REF, Suprin, Charles E., 2009/02/13
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Matt Ettus, 2009/02/13
- RE: [Discuss-gnuradio] USRP2 PPS and REF, Suprin, Charles E., 2009/02/13
- Re: [Discuss-gnuradio] USRP2 PPS and REF, Douglas Geiger, 2009/02/13