Patent ID: 8421676

Claim:
A method of determining a location of an electronic device, the method comprising: transmitting three or more signals between a first electronic device at an unknown location and a second electronic device comprising at least three antennas at known locations, the three or more signals each including a plurality of simultaneous tones having different frequencies; determining a first phase difference between at least two tones having a first frequency difference in the three or more signals accumulated during transmission between the first electronic device and a first antenna of the second electronic device; determining a second phase difference between at least two tones having a second frequency difference in the three or more signals accumulated during transmission between the first electronic device and a second antenna of the second electronic device; determining a third phase difference between at least two tones having a third frequency difference in the three or more signals accumulated during transmission between the first electronic device and a third antenna of the second electronic device; and determining the location of the first electronic device using said first, second, and third phase differences and said first, second, and third frequency differences.