METHOD TO MODIFY CALIBRATION DATA USED TO LOCATE A MOBILE UNIT
First Claim
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;
collecting observed network measurement data;
modifying said observed network measurement data; 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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Accused Products
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.
141 Citations
73 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; collecting observed network measurement data; modifying said observed network measurement data; 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 system for determining a location of a mobile station, comprising:
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a database of previously-gathered calibration data for a predetermined region in a wireless network; circuitry for collecting observed network measurement data; circuitry for modifying said observed network measurement data; and circuitry for comparing said modified network measurement data with said database of calibration data to thereby determine the location of the mobile station. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. 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 serving transmitter; collecting observed network measurement data including a first signal characteristic from said serving transmitter; modifying said observed network measurement data using said first 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 (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. 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 (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. 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; collecting observed network measurement data from each of a plurality of transmitters including a signal characteristic from each one of said plural transmitters; determining an average value for select ones of said signal characteristics; modifying said observed network measurement data using said average value; 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 (56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66)
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67. 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 (68, 69, 71, 72, 73)
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70. The method of 67, wherein the confidence measures comprises one or more of the group consisting of a pdf, the Mahalanobis distance, and a distortion measure.
Specification