rballis/tdoa-evaluation-rtlsdr

Experimental Matlab Scripts for Evaluation of a TDOA System based on RTL-SDRs

Experimental Matlab Scripts for Evaluation of a TDOA System based on RTL-SDRs

Functionality:

Matlab scripts according to my project on transmitter localization with time-difference-of-arrival (TDOA).

http://www.panoradio-sdr.de/tdoa-transmitter-localization-with-rtl-sdrs/

Presentation at the Software Defined Radio Academy, 2017

The matlab scripts are in an experimental state (though fully operational) and provided "as they are".

Input:

Three recordings from (the three) receivers done with the librtlsdr-2freq (modified librtlsdr for 2 frequency operation). First frequency is the reference transmitter, second frequency is the measurement frequency (required length: 3.6e6 (i.e. 1.2e6 samples per frequency), 2 Msps sampling rate).

Processing:

• Delay analysis of reference signal to synchronize the receptions
• Delay analysis of measurement signal to measure the TDOAs
• Available Options: bandwidth filtering, correlation smoothing, correlation type switching, signal interpolation
• Mulitlateration calculations for localization

Output:

A html/javascript file with a map showing the receivers, the hyperbolas and the most likely position of the transmitter. Note, that the earth's surface is approximated by a plane (cartesian grid). The geodetic reference point is near the city of Kaiserslautern, Germany.