[Hackrf-dev] TIME OF ARRIVAL OF CW SINGAL in Nanoseconds with HackRf

[n0p [Luis Bernal]]

With a 10Mhz clock and assuming 10 MSps the best resolution you can get is
1/10 uS (maybe 1/20 using 20MSps and both clock flanks DDR-Style)

But all of this is going to involve a lot of work, not only on the CPLD,
but also on all the software chain, as you have been already told.

And about the CPU, that only means that you won't be capable of real time
processing the samples, you will have to record the information and then
process it

2016-03-14 14:34 GMT+01:00 ERNEST MATEY <ernestmatey310 at gmail.com>:

> Hi Luis,
>
> Thank you for the reply.
> I have a GPSDO to use as clock in.
> However I see the WX scopes and analysis toolsin Gnuradio can only measure
> is Micro-seconds. That is my concern. The time scales I see are in
> milliseconds and microseconds in function.
>
> So, with what I want to do ( CW burst time of arrival) in Gnuradio. Which
> method do you advice I use to achieve this. Which blocks arrangement?‎
> And which  measuring blocks will give Nanoseconds reading?
>
> Also I observe my CPU drags at high sampling rate though sometimes Ok at
> 10MHZ. Does it count in my Nanoseconds reading?
>
> Thank You
> Ernest.
>
> Sent from my BlackBerry 10 smartphone.
> *From: *n0p [Luis Bernal]
> *Sent: *Monday, March 14, 2016 12:57 PM
> *To: *ERNEST MATEY
> *Cc: *hackrf-dev at greatscottgadgets.com >> hackrf-dev
> *Subject: *Re: [Hackrf-dev] TIME OF ARRIVAL OF CW SINGAL in Nanoseconds
> with HackRf
>
> To achieve this you will need to use a high precision 10Mhz clock and
> timestamp the signal in the CPLD of the hackrf because the USB bus will add
> a somewhat random delay to your signal
>
> 2016-03-13 7:59 GMT+01:00 ERNEST MATEY <ernestmatey310 at gmail.com>:
>
>> Hi all,
>>
>> I am working on a Project to determine the Time of arrival of CW signal.
>>
>> I am using HACKRF on gnuradio.
>>
>> How best can I do this. I have my HackRf radio, gps-clock for external
>> reference and a fast-autocorrelation block on Gnuradio.
>>
>> How can I achieve this? I want to work in Nanoseconds. How do I realize
>> this in Gnuradio.
>>
>> Ernest
>>
>> Sent from my BlackBerry 10 smartphone.
>>
>>
>> _______________________________________________
>> HackRF-dev mailing list
>> HackRF-dev at greatscottgadgets.com
>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>
>>
>
>
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