Thank you Marcus and the others for your inputs,
I created the flow almost from scratch taking into consideration your
and I came up to this aspect.
Here they are:
http://imageshack.com/a/img542/9189/5jxl.png (FFT output)
I added delays to simulate targets. I didn’t manage to see any Doppler
this time either.
What am I doing wrong?
Thank you for your time.