When the wanted frequencies are known to us, we can input the wanted band of frequencies to a program that I have upgraded from GNURadio, which performs an energy calculation on the band in a closed loop.

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That program outputs the value of the emitted energy from the cellular device as measured from the USRP every second or less (depending on the measured bandwidth), and can tell me if I'm getting closer/further to the cellular device.

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The Program can be downloaded here.

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in order to use it enter the following command in the terminal:

   $   '***DIRECTORY_OF_usrp_spectrum_sense.py***/usrp_spectrum_sense.py' 826M 827M -A TX/RX -g 50

to perform an energy test between frequencies 826Mhz and 827Mhz, with gain of 50.

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