Re: [Discuss-gnuradio] GR-Radar, Passive Radar

[Karl Petrow]

Could you just use Yagi's and send I/Q streams to a server?  Maybe a time issue 
with TCP/IP lag.  But you could possibly time stamp the I/Q data..  
Additionally, I am interested in larger, slower marine vessels more than small, 
fast moving planes.

What do you mean by Dynamic Range?  I have briefly looked at the University of 
Washington setup where they are separated by mountains.  I assume since they 
are observing such a far distance, the receiving stations are relatively not 
far apart(150km).  Couldn't you network two stations like they do here and just 
use yagi's(one pointed directly toward the tower and one towards your area of 
interest?)  They would need to be close since your observation field is at a 
much shorter distance.  Why would you need to use only one USRP?  I can send a 
I/Q stream with a Raspberry Pi and have all demodulation and processing done on 
the server side.

Thanks for the help,

Karl Petrow

  

-----Original Message-----
From: Johnathan Corgan [mailto:address@hidden 
Sent: Tuesday, March 26, 2013 9:53 AM
To: Karl Petrow
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] GR-Radar, Passive Radar

On Mon, Mar 25, 2013 at 9:18 AM, Karl Petrow <address@hidden> wrote:

> Does anyone have a link to any recent progress made on this?  I 
> recently saw this lecture:

We've done work with some commercial customers researching low-power active 
radar with USRPs, but these were (customer) internal projects that did not get 
published externally.

Regarding passive radar--it is very difficult with low-cost hardware such as 
the USRP to get the dynamic range needed to simultaneously receive the direct 
path from an emitter and the echoes from an airborne target.  Some types of 
scene geometry would allow physical shielding to attenuate the direct path for 
a subset of the antenna array, which would help reduce the dynamic range 
necessary.

Johnathan