Re: [Discuss-gnuradio] Mixing two signals for Radar application.

[Marcus Müller]

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Hi Dimitris,

I thought you might be supplying us with some background on the flow
graph, hardware, expected Doppler Shift, target range etc.
You're just posting the effect, without even referring to what you're
expecting.

Greetings,
Marcus

On 27.03.2014 10:11, Dimitris Siafarikas wrote:
> Hi Marcus,here is the flow graph and the output signals with
> movement across the antennae and
> without.http://tinypic.com/r/a5et5k/8  (GRC
> flow)http://tinypic.com/r/nbeq0k/8  (without
> movement)http://tinypic.com/r/2s7dnye/8 (with movement)Thank
> you.Dimitris. On 26.03.2014 15:28, Marcus Müller wrote:> Hi
> Dimitris,
>> 
>> in theory, mixing should be exactly what you're doing - the 
>> multiplication of a signal with another one.
>> 
>> Without you posting what your flow graph looks like or what the
>> signal you get out of it actually is, helping you might be a bit
>> hard... Please supply as much information as necessary to
>> understand what might be going wrong ;)
>> 
>> 
>> Greetings, Marcus
> 
> On 26.03.2014 15:18, Dimitris Siafarikas wrote:
> 
>>> Hi list, I am in the process of building an FMCW radar. For
>>> this to work, I have to mix two signals. I tried to do it with
>>> the "multiply" block but no luck. I tried then to see how
>>> exactly this block works. It seems that it does not behave As
>>> it should be. Referring to theory, I should see the sum and the
>>> difference of the two signals. Looking at the FFT plot, I can't
>>> say that works.
>>> 
>>> 
>>> 
>>> What am I doing wrong? Am I missing something?
> 
> 
> 
> 
> 
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