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

Fri, 01 Apr 2016 11:04:13 -0700

Thank you very much for reply. 

However,I also want to know, how can I detect the arrival of the signal burst? It is a satellite CW signal. 

Which algorithm do you suggest and which blocks in GRC should I consider to measure the arrival time.  

Thank you
Ernest.



Sent from my BlackBerry 10 smartphone.
From: n0p [Luis Bernal]
Sent: Monday, March 14, 2016 3:12 PM
To: ERNEST MATEY
Cc: [email protected] >> hackrf-dev
Subject: Re: [Hackrf-dev] TIME OF ARRIVAL OF CW SINGAL in Nanoseconds with HackRf

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 <[email protected]>:
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: [email protected] >> 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 <[email protected]>:
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.


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