Re: [Discuss-gnuradio] Need help: How to extract timestamps of data for UHD mimo source block?

[Josh Blum]

On 10/06/2010 04:24 AM, Hongliang Zhang wrote:
> Hi everyone,
>
> I set up 4 USRP2 boards for MIMO receiver system for array antennas, and use
> the PPS signal to synchronise them. I wish to collect the data from the
> boards as well as the associated timestamps for the four boards.
>
> Could someone teach me how to read the time stamps from a UHD mimo source
> block?  Do I need to modify the block in C++ or Python scripts?

The timestamps are inside the metadata, they are discarded in the work 
function: 
http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/lib/uhd_mimo_source.cc?h=next#n127

You will need to modify the mimo source c++ and find a place to store 
the timestamps, or write a c++ app that calls into the UHD mimo_usrp 
interface directly.

-Josh

> Thanks so much for every help and suggestions.:clap:
>
> Best regards,
> Hongliang