Calibration of a device location measurement system that utilizes wireless signal strengths
First Claim
1. A method of calibrating a system used to determine new location(s) depending on observed signal properties, comprising:
- measuring signal properties related to identified locations; and
generating a regression function based at least in part upon the signal properties, the function estimating new location(s) as a function of observed signal properties.
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Abstract
An architecture for minimizing calibration effort in an IEEE 802.11 device location measurement system. The calibration technique is based upon a regression function that produces adequately accurate location information as a function of signal strength regardless of gaps in the calibration data or minimally available data. The algorithm takes a set of signal strengths from known room locations in a building and generates a function giving (x,y) as a function of signal strength, which function may then be used for the estimation of new locations. Radial basis functions, which are simple to express and compute, are used for regression. The fact that the algorithm maps signal strength to continuous location makes it possible to skip rooms during calibration, yet still evaluate the location in those rooms.
68 Citations
20 Claims
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1. A method of calibrating a system used to determine new location(s) depending on observed signal properties, comprising:
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measuring signal properties related to identified locations; and
generating a regression function based at least in part upon the signal properties, the function estimating new location(s) as a function of observed signal properties. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of calibrating a wireless device location measurement system, comprising:
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accessing at least one wireless transmitting device;
logging signal strength data for each of wireless transmitting device; and
generating a regression function based upon the signal strength data, the regression function utilized to estimate new location(s). - View Dependent Claims (8)
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9. A location system that uses observed signal properties to determine new location(s), comprising:
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a measuring component for measuring signal properties related to identified locations; and
a regression component for generating a regression function based at least in part upon the signal properties, the function estimating new location(s) based upon observed signal property data. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification