Re: phase align and passive radar (was Re: Fwd: Re: [Discuss-gnuradio] math range error?)

[Eric Blossom]

On Thu, Feb 23, 2006 at 12:10:58AM +0100, Martin Dvh wrote:
> joe j wrote:
> > 
> I'm trying to take the phase difference between two signals and
> combining it back with one signal's magnitude - using this for a
> radar project and I'm using 2 signals.  The first signal is the
> signal I get back from reflection and the second is my reference
> signal (I subtract the phase from my reference signal to the signal
> collected then put it back with the original magnitude, I get the
> actual signal) - main goal is to get doppler spectrum.
> 
> I attached two examples of how I align two signals with a phase difference.
> For this to work you need gr.agc_cc and/or gr.phase_modulator_fc which are 
> not in cvs yet.
> (But probably will be very soon)

They're in!

> I extracted these from the code I am using to try to do passive radar with 
> fm, TV and gsm signals.
> My current work on this can be donwloaded from
> http://www.olifantasia.com/pub/projects/gnuradio/mdvh/passive_radar/
> 
> The files on my website are not nicely formatted examples but just my current 
> hacking code.
> 
> There are also an fft based correlators in there.
> And a fake usrp signal generator which models and fm transmitter including a 
> single echo received on two antenna's.
> 
> I hope it is of use,
> Greetings,
> Martin

Thanks for posting the link, Martin!

Eric