Method to modify calibration data used to locate a mobile unit
DC CAFCFirst Claim
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1. A method for determining a location of a mobile station, comprising:
- providing a database of previously-gathered calibration data for a predetermined region in a wireless network, wherein said network includes a first transmitter and a second transmitter;
collecting observed network measurement data including a first signal characteristic from said first transmitter and a second signal characteristic from said second transmitter;
determining which of said first and second signal characteristics has a greater magnitude;
modifying said observed network measurement data using the greater magnitude signal characteristic; and
comparing said modified network measurement data with said database of calibration data to thereby determine the location of the mobile station.
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Abstract
A method of modifying calibration data used to geo-locate a mobile station located in an indoor environment is disclosed. When a mobile station is located indoors, the signal strength of signals received and/or transmitted by the mobile station have the tendency to be lower than the strength of the signals received by a mobile station located outdoors. As a result of these lower signal strengths, geo-location efforts which rely on signal strengths may result in unsatisfactory location accuracy. Modifying pre-existing calibration data obtained outdoors may provide a way to simulate indoor calibration data characteristics.
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Citations
21 Claims
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1. A method for determining a location of a mobile station, comprising:
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providing a database of previously-gathered calibration data for a predetermined region in a wireless network, wherein said network includes a first transmitter and a second transmitter; collecting observed network measurement data including a first signal characteristic from said first transmitter and a second signal characteristic from said second transmitter; determining which of said first and second signal characteristics has a greater magnitude; modifying said observed network measurement data using the greater magnitude signal characteristic; and comparing said modified network measurement data with said database of calibration data to thereby determine the location of the mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for determining a location of a mobile station, comprising:
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providing a database of previously-gathered outdoor calibration data for a predetermined region in a wireless network; collecting network measurement data; comparing said network measurement data with said database of calibration data to thereby determine a plurality of location estimate of the mobile station determining a confidence measure for each of the plurality of location estimates; determining the location of the mobile station based on the plurality of location estimates and the respective confidence measures. - View Dependent Claims (16, 17, 19, 20, 21)
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18. The method of 15, wherein the confidence measures comprises one or more of the group consisting of a pdf the Mahalanobis distance, and a distortion measure.
Specification