Patent ID: 7023356

Claim:
A system for monitoring individuals and objects in an area, the system comprising: at least one wireless identification tag, the at least one wireless identification tag including memory, the memory having information stored therein, the information being associated with at least one of a person and object associated with the at least one wireless identification tag; and an interrogator, the interrogator wirelessly transmitting an interrogation signal, the interrogation signal including a sequence of interrogation codes, at least one of the interrogation codes being associated with the at least one wireless identification tag, the at least one wireless identification tag wirelessly transmitting an acknowledgment signal in response to receiving the at least one interrogation code associated with the at least one wireless identification tag, the acknowledgment signal being associated with the at least one wireless identification tag, the acknowledgment signal including at least a portion of the information, the interrogator receiving the acknowledgment signal, thereby monitoring at least one of the person and object, the interrogator determining the distance of the wireless identification tag from the interrogator by transmitting a first continuous wave signal, receiving the first continuous wave signal by the electronic identification tag, transmitting a second continuous wave signal by the electronic identification tag until the step of receiving the first continuous wave signal has terminated, sampling the second continuous wave signal at at least one intermediate frequency, and processing the sampled second continuous wave signal using the Chinese Remainder Theorem.