Hi Manuel,
On 03/05/2015 01:40 PM, Manuel David Lozano Amezquita wrote:
>
> Hi Marcus,
>
> Now I have another question, How can I estimate the time shift in
> fractional samples?, for example, I have a Cosine signal with
> amplitude of 1 v, and 1 kHz, and I configure my sample rate in 1 MHz.
> Then I transmit that signal, and some time later I receive it with
> another antenna, so How could I determine the time difference of both?.
That is a question that seems to be central to your problem. I have some
approaches to answers, but explaining them in depth will take rather
long, and not explaining them won't actually help you. Have a look at
what a cross correlation is; you should be able to understand what you
need to do rather quickly.
>
> The objective is to measure the distance between the Tx antenna and
> the Rx antenna, And I know that distance=velocity/time, I know the
> velocity but I need the time that the signal spends from the Tx
> antenna to ]Rx antenna.
Yep, classical radio ranging problem; have a look at existing radar
algorithms. Also bear in mind that the temporal resolution of your
system is given by Nyquist's theorem, which leads you to $\delta t =
\frac{1}{f_\text{sample}}$ in the complex case, to assess if your
application is feasible at all.
>
> All the advices or tips that you could give me, I will appreciatte it
> a lot.
In all honesty: what you're having are basic signal processing
questions, and you should read a textbook on signal theory. GNU Radio
has a suggested reading page, which might give you a start[1].
Greetings,
Marcus
[1] https://gnuradio.org/redmine/projects/gnuradio/wiki/SuggestedReading
> From: [email protected]
> To: [email protected]; [email protected]
> Subject: Re: [Discuss-gnuradio] How to show the internal clock on the
> flowgraph
>
> Hi Manuel,
>
> your signal is sampled with a sample rate. You can now estimate the
> time shift in (fractional) samples, and calculate the "wall clock"
> time difference by dividing by the sampling rate.
> You, as a user, set the sampling rate that your device uses. The B210
> is very flexible in respect to that.
>
> Best regards,
> Marcus
>
> On 03/02/2015 09:02 PM, Manuel David Lozano Amezquita wrote:
>
> Hi Marcus
>
> Thank you for your time,
>
> I need to transmit a signal and then receive it, so I need the
> time difference between the two signals. I thought that I need a
> clock in both so I could compare in the same time scale the two
> signals. Thats why I need the clock.
>
> Or how can I take the time between the 2 signals?
>
> Thank you!
>
> El mar 2, 2015 2:53 PM, =?ISO-8859-1?Q?Marcus_M=FCller?=
> <[email protected]> <mailto:[email protected]> escribió:
> Hi Manuel,
> On 03/02/2015 08:38 PM, Manuel David Lozano Amezquita wrote:
>
> Hi Marcus, I know that the clock of the USRP b210 is 62MHz,
> but I need to show it on the flowgraph to compare the phase of
> two signals.
>
> I'm really confused. You *can* configure the master clock rate,
> which is the rate at which the signal is sampled, to be up to
> 61.44MHz, but that's neither the default nor 62MHz. There are
> several clocks in the B210, so maybe I'm missing something.
>
> Where does that freuquency come from? What does it signify?
> Why do you need it to compare phases? Of what?
>
> Best regards,
> Marcus Müller
>
> Thanks
>
> Manuel
>
> El mar 2, 2015 2:26 PM, =?ISO-8859-1?Q?Marcus_M=FCller?=
> <[email protected]> <mailto:[email protected]>
> escribió:
> Hi Manuel,
>
> could you explain what you mean with "internal clock of the
> board"?
>
> Best regards,
> Marcus Müller
>
> On 03/02/2015 08:04 PM, Manuel David Lozano Amezquita wrote:
>
> Hi everyone,
>
> I'm using a USRP B210 board, and I don't know how to watch
> on the flowgraph the internal clock of the board, I need
> it to compare the time difference of two signals.
>
> Please Help Meeeee.
>
> Thanks
>
> Manuel
>
>
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>
>
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