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[Discuss-gnuradio] Picking up RF cellular signals

From: Meny Sidar
Subject: [Discuss-gnuradio] Picking up RF cellular signals
Date: Mon, 14 Mar 2016 16:54:48 +0200

Hi guys,

I am currently working on a project for my university, where i'm trying to locate cellular phones using SDR (USRP B210).
The idea of the project is to be able to find survivors/victims in disaster areas, such as earthquakes, by assuming they have their cellular on them.

What i did so far, is a program that calculates and outputs in a loop the power transmitted from a cellular phone from it's uplink channel. that can tell me my distance to it.
problem is, that cellular phones are usually in idle mode and not transmitting at all. 
So it works, but only if the phone is currently transmitting to the network (phone call, internet, etc..)

I'm trying to find a solution for this,
There has to be a way of knowing that some kind of RF transmitter/receiver is near me...
If anyone can shed some light on this subject, what can i do or if i need to go in another way, i'll be very grateful! 
right now i'm stuck.

Thanks a lot,

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