Determining the position of a mobile device using the characteristics of received signals and a reference database
First Claim
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1. A method of determining a location of a mobile device, the mobile device comprising a plurality of antennas, the method comprising:
- at each of the plurality of antennas of the mobile device, receiving a signal in a first plurality of signals from each of a plurality of antennas of a single transmitting device over a separate transmission channel in a plurality of transmission channels;
generating a multichannel profile from a superposition of the first plurality of signals, the multichannel profile comprising a plurality of peaks, each peak in the plurality of peaks corresponding to a signal in the first plurality of signals received over a transmission channel in the plurality of transmission channels;
computing a first plurality of parameters associated with the peaks of the multichannel profile;
retrieving, from a database, a second plurality of parameters associated with a second plurality of signals previously received from the plurality of antennas of said transmitting device at 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.
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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.
178 Citations
30 Claims
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1. A method of determining a location of a mobile device, the mobile device comprising a plurality of antennas, the method comprising:
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at each of the plurality of antennas of the mobile device, receiving a signal in a first plurality of signals from each of a plurality of antennas of a single transmitting device over a separate transmission channel in a plurality of transmission channels; generating a multichannel profile from a superposition of the first plurality of signals, the multichannel profile comprising a plurality of peaks, each peak in the plurality of peaks corresponding to a signal in the first plurality of signals received over a transmission channel in the plurality of transmission channels; computing a first plurality of parameters associated with the peaks of the multichannel profile; retrieving, from a database, a second plurality of parameters associated with a second plurality of signals previously received from the plurality of antennas of said transmitting device at 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 (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A non-transitory machine readable medium storing a program for determining a location of a mobile device comprising a plurality of antennas, the program executable by at least one processor, the program comprising sets of instructions for:
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receiving, at each of the plurality of antennas of the mobile device, a signal in a first plurality of signals from each of a plurality of antennas of a single transmitting device over a separate transmission channel in a plurality of transmission channels; generating a multichannel profile from a superposition of the first plurality of signals, the multichannel profile comprising a plurality of peaks, each peak in the plurality of peaks corresponding to a signal in the first plurality of signals received over a transmission channel in the plurality of transmission channels; computing a first plurality of parameters associated with the peaks of the multichannel profile; retrieving, from a database, a second plurality of parameters associated with a second plurality of signals previously received from the plurality of antennas of said transmitting device at 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 (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification