METHOD AND SYSTEM FOR DETERMINING THE POSITION OF A MOBILE DEVICE
First Claim
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1. A method of determining a location of a mobile device, the method comprising:
- receiving a first plurality of signals with known transmission patterns at the mobile device from a set of transmitters, the first plurality of signals comprising at least one multipath signal;
computing a first set of parameters from the first plurality of signals using the known transmission pattern;
retrieving, from a database, a second set of parameters computed from a second plurality of signals, the second plurality of signals comprising at least one multipath signal, each parameter associated with a location where a corresponding signal from the second plurality of signals was received; and
comparing the first set of parameters with the second set of parameters; and
determining the location of the mobile device based on the comparison.
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Abstract
Some embodiments use scanning devices to characterize radio signals received at a number of locations within a geographical area of interest. The signal characteristics along with the location information associated with the characteristics are stored in a centralized reference database. A mobile device characterizes signals it receives at a certain location and compares the characteristics with the signal characteristics stored in the reference database to obtain accurate location information of the certain location.
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Citations
37 Claims
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1. A method of determining a location of a mobile device, the method comprising:
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receiving a first plurality of signals with known transmission patterns at the mobile device from a set of transmitters, the first plurality of signals comprising at least one multipath signal; computing a first set of parameters from the first plurality of signals using the known transmission pattern; retrieving, from a database, a second set of parameters computed from a second plurality of signals, the second plurality of signals comprising at least one multipath signal, each parameter associated with a location where a corresponding signal from the second plurality of signals was received; and comparing the first set of parameters with the second set of parameters; and determining the location of the mobile device based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of determining a location of a mobile device, the method comprising:
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at a set of scanning devices, receiving a plurality of signals from a plurality of signal sources, the plurality of signals comprising at least one multipath signal; determining a location where each signal is received by a scanning device; computing a set of parameters from the received signals; storing the set of computed parameters and the locations where each signal in a reference database; receiving a request for parameters to determine the location of the mobile device; retrieving a set of parameters from the reference database, the set of parameters for comparing with a set of parameters computed from signals received by the mobile device to determine the location of the mobile device. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of determining a location of a mobile device, the method comprising:
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receiving a first plurality of signals at the mobile device from a transmitting device over a set of transmission channels, the transmitting device comprising a plurality of antennas, each of the plurality of signals received from one of the antennas of a transmitting device; characterizing the set of transmission channels to compute a first plurality of parameters associated with the first plurality of signals; retrieving, from a database, a second plurality of parameters associated with a plurality of signals previously received from the transmitting device by a set of scanning devices; correlating the first plurality of parameters with the second plurality of parameters; and determining the location of the mobile device based on the correlation. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification