Patent ID: 7948439

Claim:
A system, comprising: a first beacon having a first transmitter and a second beacon having a second transmitter, the first and second beacons configured to be attached to first and second vehicles, respectively, the first and second transmitters each further configured to transmit successive signals at predetermined time intervals; a plurality of portable tracking stations, each tracking station positioned at a location different from that of each other tracking station, each tracking station configured to receive the signals transmitted by at least one of the first and second transmitters, each tracking station further configured to distinguish signals transmitted by the first transmitter from signals transmitted by the second transmitter, each of the tracking stations further configured to determine respective angles of arrival associated with the signals received from at least one of the first and second transmitters, each of the tracking stations further configured to be in signal communication with at least one other of the tracking stations; and at least one portable processing device in signal communication with at least one of the tracking stations, the processing device configured to determine a location of the first vehicle relative to a location of the second vehicle based on the respective determined angles of arrival; wherein the first and second beacons are configured to communicate with the plurality of portable tracking stations in a single communication direction.