Re: [Discuss-gnuradio] extract timestamp data

[Dimitris Symeonidis]

I was contemplating trying to use the timestamps and 4 antennas on the
same usrp{1,2} to try and create a smart antenna array for DOA...

Dimitris Symeonidis
"If you think you're too small to make a difference, try sleeping with
a mosquito!" - Amnesty International



On Thu, Mar 12, 2009 at 15:51, Douglas Geiger
<address@hidden> wrote:
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> Cocuzzo, Daniel C. wrote:
>> I'm also wondering about how to extract ethernet packet information,
>> such as timestamp. If anyone has any pointers to reference materials it
>> would be greatly appreciated.
>>
>> Thanks,
>> Dan
>>
>>
>
>  The easiest way (depending on what you are doing with the timestamps)
> is probably by dealing with the low-level libusrp2, and writing a custom
> copy handler (look at rx_streaming_samples.cc in usrp2/host/apps). The
> metadata structure (in usrp2/metadata.h) provides the timestamp from the
> fpga.
>  I'm playing around right now with creating a custom source block that
> has access to the timestamps (i.e. the copy handler passes it from the
> low-level library into the source block - but not to the rest of the
> flowgraph). I'm only interested in it as far as providing aligned
> samples from two USRP2 (like usrp_multi does for the USRP1). Depending
> on what you need the timestamps for, that may be the way to go.
>  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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