Patent ID: 6876326

Claim:
A method of pinpointing the physical position of a target communication device, comprising: (a) determining a position of the target communication device with sufficient accuracy to direct a search communication device to within a vicinity of the target communication device; (b) repeatedly measuring the range between the target communication device and the mobile search communication device once the search communication device is within the vicinity by repeatedly exchanging an outbound ranging signal and a reply ranging signal between the target communication device and the search communication device and determining a round-trip signal propagation time of the outbound ranging signal and the reply ranging signal; and (c) directing movement of the search communication device toward the target communication device in response to the repeatedly measured range, thereby pinpointing the position of the target communication device by reducing the range between the search and target communication devices, wherein synchronization of system clocks of the target communication device and the mobile search communication device is not necessary.