Building an RF Direction Finding Robot

The RTL-SDR site highlights the work of Humpelstilzchen in getting a robot to drive towards a 433 MHz beacon transmitter 

The experiment used a 433 MHz module to send out an FSK beacon.

On the robot two antennas are used for the time difference of arrival/pseudo-doppler direction finding technique, and PIN diodes are used to rapidly switch between the antennas. A GNU Radio script running on a Humming Board single board computer computes the TDOA/pseudo-doppler algorithm.

RTL-SDR Post -

Hackaday - Wild Thumper based ROS robot -