Re: [Discuss-gnuradio] Synchronization issue with multiple USRPs

[Josh Blum]

Could you post a screen shot of the flow graph or attach the grc file? -Josh

On 04/24/2011 11:10 PM, Khalid Jamil wrote:
> Hi,
> 
> I have an eight element circular antenna array and I want to do beamforming
> using eight N210s in receive mode. So, I distributed 10MHz/1PPS reference to
> each N210 to synchronized them and routed the eight GbE ports through a
> switch to the computer. I store data from each channel in one file/channel
> using gnuradio companion. Later I want to do beamforming processing.
> 
> Now, when I start receiving the data, there is a fixed phase offset from
> channel to channel. That's OK as long as I know how much is it. The problem
> I am facing is that this phase offset is random each time you start
> acquiring the data. Now how can i know about it to make a correction in the
> array processing. Is there a way to fix it or take care of it in system
> calibration?
> 
> Thanks,
> 
> Khalid.
> 
> 
> 
> 
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