The present invention provides a method for the real-time location of a multiplicity of Mobile Units by correlating a commanded radio signal from the specific Mobile Units received by multiple fixed antennae. The Mobile Units are equipped with a transceiver that is activated by an encoded broadcast and responds with a burst transmission on a separate frequency that is received by several well-surveyed antennae at slightly different times due to the variable distance of the Mobile Units to the Fixed Receiver antennae. The location of a Mobile Unit is determined by resolving the burst transmission time delay differences from at least four fixed antennae to eliminate the common system unknowns.