Welcome to the RFCTF Virtual TDOA Foxhunt
Time Difference of Arrival (TDOA) is a technique used to locate transmitters
utilizing precisely timed receivers, along with a server to aggregate and
process the collected RF. TDOA works best with wide bandwidth signals, and
you may even see it used to locate the location of lightning strikes. It
doesn't take a lot of data to extract a time difference, therefore the IQ
samples you'll be provided with for this challenge are only 100 milliseconds
long.
Rather than drawing straight lines on a map like you would with direction of
arrival (DOA) techniques, TDOA uses hyperbolic arcs drawn between two receivers.
Adding a third receiver allows you to draw two more sets of hyperbolas,
eventually leading you to finding a common intersection.