Hi all, how to use usrp and gnuradio support triangulation to locate a cell phone

GNU Radio
1

Hi all, I am a fresh on usrp and gnuradio, now I want to use them to
support
locate a cell phone, and what I know is locate a cell phone need to use
triangulation method. Anyone know if gnuradio contain triangulation
block or
any open triangulation algorithm available?

Thanks!

2

That cellphone triangulation stuff is just an urban legend:

-Josh

3

On May 31, 2010, at 8:49 PM, John Wu wrote:

hi Harley,
I think I can bypass establishing communication with the cell phone I want to track, I can use app like airprobe to sniff the cell phone radio. So now the main task is find a good method to locate it. For now there are two methods. First is use three receiver receive the TDOA and use hyperbolic to locate the cell phone. this method need the three receivers synchronize the timer very accurate. the second is use two antenna arrays to use AOA to locate the cell phone, you have mentioned that you have support the antenna arrays in usrp to locate BTS. I want to build my receiver as a handset but if I choose AOA method the distance may be several meters between two antennas in a antenna array. So if it possible to reduce the distance between two antennas in a antenna array and keep the location accuracy? What is the smallest distance?

You are in a different world with a handheld device, my application has
the array mounted on the belly of an aircraft so my worries are not with
the antenna since I have lots of room for element spacing. The
literature abounds with articles on direction finding techniques and
what you are hoping to do is not out of the ordinary, but I am afraid
you are on your own in that regard.

All that I have at this juncture, besides the fact that I have the
software working on a virtual machine, is the explanation of how the
unused GPIO ports can be accessed, which is essential for the antenna
control that I require. We are on break right now, but next week I have
some surprises in store for some of my unwitting students…perhaps they
will post here as the system evolves.

Harley

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