Re: [Discuss-gnuradio] [Discuss- gnuradio] Nanoseconds Signal Time of Arrival on GRC

[Martin Braun]

It also depends on the algorithm you're using for detection. It's
unlikely they have sub-sample accuracy.

M

On 03/14/2016 08:58 AM, Marcus Müller wrote:
> Hi Ernest,
> 
>> Can GRC go Nanoseconds?
> GRC is just a frontend to baseband sample processing blocks. So there's
> not really an answer to this. If you had a device that would be giving
> you 2GS/s, yes, and if you can build an application that estimates the
> phase of an incoming signal, then also, maybe:
> 
> well, first of all, you will need to bring your receiver to an exact
> time, within whatever "exact" means to you. For USRPs, you might use the
> GPSDOs, and further timing refinement tricks (see Johannes Schmitz' talk
> at FOSDEM this year).
> Then, you'll need to determine a reference phase for your downconverted
> signal. Then, basically with the methods of interferometry, you can
> determine a sub-sample accurate estimate of the receive signal timing.
> 
> There's not a "ready to use" for your problem, because it depends on
> such an enormous number of specifics of your problem (chief amongst
> these hardware, accuracy demands, observation time, SNR, modulation of
> the CW). If your signal is really just a continuous wave, you'll always
> be signal-period ambiguous, unless you have another source of timing
> information.
> 
> It might be really worthwhile pointing you to the GNU Radio Guided
> Tutorials; you seem to have quite a good idea of what you want to
> implement, but your understanding of what GNU Radio does, and doesn't
> do, where the boundaries between GRC, GR, a flow graph and the whole SDR
> system lie might be lacking a bit behind that:
> https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials
> 
> Best regards,
> Marcus
> 
> On 03/13/2016 07:50 AM, ERNEST MATEY wrote:
>> Hi All,
>>
>> I am running a signal analysis on GRC. 
>> I will receive satellite CW signal and I want to know the exact
>> accurate time I received the CW signal.  I'm expecting the CW signal
>> as a sudden burst ‎. 
>>
>> What methods can I use in my GRC. Which blocks or Flow graph can I do
>> to achieve this?
>>
>> I am looking for accuracy in Nanoseconds. 
>> How can I achieve this? Can GRC go Nanoseconds?
>>
>> Thank you all GRC experts for helping!
>> Ernest
>>
>>
>>
>> Sent from my BlackBerry 10 smartphone.
>>
>>
>>
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> 
> 
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