Patent ID: 8340022

Claim:
A wireless location determination system, comprising: a location determination target configured to generate and transmit a pulse train, wherein the pulse train comprises a plurality of pulses and wherein there are regular time intervals between the transmitted pulses; a plurality of nodes configured to respectively receive the pulse train transmitted from the location determination target, calculate respective standard deviations of time intervals between the received pulses corresponding to the regular time intervals between the transmitted pulses and compute respective reliability values based on the respective standard deviations; and a location determination server configured to receive messages including the respective reliability values from the respective nodes, and obtaining determine a location of the location determination target, wherein the location determination server is configured to calculate distances between the tag and the respective nodes based upon times of arrival of pulses at the respective nodes, and determine the location of the location determination target by applying the respective reliability values to the calculated distances, and wherein the messages further include the times of arrival of the initial pulses at the respective nodes.