Methods and systems for determining the location of an electronic device
First Claim
1. A method of determining a location of an electronic device, the method comprising:
- transmitting one or more signals between a first electronic device at an unknown location and three or more electronic devices at three or more corresponding known locations, wherein the one or more signals each includes a plurality of simultaneous tones having different frequencies;
determining at least one first phase difference between at least two tones having a first frequency difference in the one or more signals accumulated during transmission between the first electronic device at the unknown location and a first electronic device of said three or more electronic devices;
determining at least one second phase difference between at least two tones having a second frequency difference in the one or more signals accumulated during transmission between the first electronic device at the unknown location and a second electronic device of said three or more electronic devices;
determining at least one third phase difference between at least two tones having a third frequency difference in the one or more signals accumulated during transmission between the first electronic device at the unknown location and a third electronic device of said three or more electronic devices; and
determining the location of said first electronic device at the unknown location using said first, second, and third phase differences and said first, second, and third frequency differences.
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Accused Products
Abstract
Embodiments of the present invention include a method of determining a location of a mobile device. The method comprises transmitting a signal between a plurality of known locations and receiving signal at device of unknown location such as a mobile device. The signal may include multiple tones having different frequencies and resulting in sets of residual phase differences. The location of the mobile device may be determined using the known locations and the frequency and phase differences between the transmitted tones. In one embodiment, OFDM signals may be used between an access point and mobile device, for example, to determine the location of the mobile device.
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Citations
24 Claims
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1. A method of determining a location of an electronic device, the method comprising:
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transmitting one or more signals between a first electronic device at an unknown location and three or more electronic devices at three or more corresponding known locations, wherein the one or more signals each includes a plurality of simultaneous tones having different frequencies; determining at least one first phase difference between at least two tones having a first frequency difference in the one or more signals accumulated during transmission between the first electronic device at the unknown location and a first electronic device of said three or more electronic devices; determining at least one second phase difference between at least two tones having a second frequency difference in the one or more signals accumulated during transmission between the first electronic device at the unknown location and a second electronic device of said three or more electronic devices; determining at least one third phase difference between at least two tones having a third frequency difference in the one or more signals accumulated during transmission between the first electronic device at the unknown location and a third electronic device of said three or more electronic devices; and determining the location of said first electronic device at the unknown location using said first, second, and third phase differences and said first, second, and third frequency differences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of determining a location of a first electronic device at an unknown location using signals received from second, third, and fourth electronic devices at known locations, the method comprising:
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receiving at the first electronic device, first, second, and third signals from the second, third, and fourth electronic devices respectively, each signal comprising a plurality of tones comprising a plurality of frequencies, said tones modulated with a carrier frequency to generate each of said signals; determining phase differences between tones at different frequencies in each signal, each phase difference having a corresponding frequency difference; extracting an amplitude for each of said plurality of tones; estimating first, second, and third distances from the first device to each of the second, third, and fourth devices respectively using each extracted amplitude and a corresponding transmitted power value; selecting a first integer representing a difference in an integer number of wavelengths of two tones transmitted between the first electronic device and the second electronic device, a second integer representing a difference in an integer number of wavelengths of two tones transmitted between the first electronic device and the third electronic device, and a third integer representing a difference in an integer number of wavelengths of two tones transmitted between the first electronic device and the fourth electronic device, wherein the integers are selected based on the estimated first, second, and third distances; calculating the first, second, and third distances based on (1) the phase differences and the corresponding frequency differences of the signal received from each corresponding device and (2) the first, second, and third integers; and determining the location of said first electronic device based on said first, second, and third distances. - View Dependent Claims (22, 23, 24)
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21. A method of determining a location of a first electronic device at an unknown location using signals received from second, third, fourth, and fifth electronic devices at known locations, the method comprising:
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receiving at the first electronic device, first, second, third, and fourth signals from the second, third, fourth, and fifth electronic devices respectively, each signal comprising a plurality of tones comprising a plurality of frequencies, said tones modulated with a carrier frequency to generate each of said signals; determining phase differences between tones at different frequencies in each signal, each phase difference having a corresponding frequency difference; calculating distances from the first device to each of the second, third, fourth, and fifth devices based on the phase differences and the corresponding frequency differences of the signal received from each corresponding device; and determining the location of said first electronic device based on said distances from the first electronic device to each of said second, third, fourth, and fifth electronic devices.
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Specification