A system for localizing a transmitting wireless device within a known volume, the system including antennae deployed in respective locations at least some within the known volume, each of the antennae operative to receive and output a signal from the transmitting device; analog-to-digital converter/s; and a processor receiving digital sampled received signals and computing real time output parameter/s as function of: sampled received signals S, received from the transmitting wireless device at antenna i; and of sampled signals, received from the transmitting wireless device at antenna j and sampled, simultaneously with reception at antenna I and sampling of sampled received signals S, function being independent of power level at which transmitting device is transmitting, and to estimate transmitting wireless device's location within volume by comparing the parameter/s to reference output parameters respectively having known correspondence to known possible locations/s within volume, for at least two of the antennae.