Error estimate concerning a target device's location operable to move in a wireless environment
First Claim
1. A method for determining an error estimate concerning a target device'"'"'s location, wherein the target device is operable to move in a wireless environment and to communicate with the wireless environment using signals each of which has at least one measurable signal value;
- the method comprising;
maintaining a probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several sample points in the wireless environment;
making a set of observations of signal values in the wireless environment at the target device'"'"'s location;
estimating the target device'"'"'s location based on the probabilistic model and the set of observations;
determining the error estimate as a combination of products over several sample points, each product comprising;
a probability for the sample point in question being the target device'"'"'s location; and
a distance function between the sample point in question and the target device'"'"'s estimated location.
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Accused Products
Abstract
A method for determining an error estimate concerning a target device'"'"'s location. The target device moves and communicates in a wireless environment using signals having at least one measurable signal value. A probabilistic model of the wireless environment indicates a probability distribution for signal values at several sample points in the wireless environment. A set of observations of signal values is made and the target device'"'"'s location is estimated based on the probabilistic model and the set of observations. The error estimate (43) is determined as a combination of products over several sample points (SP). Each product comprises a probability distribution (41) for the sample point in question being the target device'"'"'s location and a distance function (43) between the sample point in question and the target device'"'"'s estimated location.
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Citations
20 Claims
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1. A method for determining an error estimate concerning a target device'"'"'s location, wherein the target device is operable to move in a wireless environment and to communicate with the wireless environment using signals each of which has at least one measurable signal value;
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the method comprising;
maintaining a probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several sample points in the wireless environment;
making a set of observations of signal values in the wireless environment at the target device'"'"'s location;
estimating the target device'"'"'s location based on the probabilistic model and the set of observations;
determining the error estimate as a combination of products over several sample points, each product comprising;
a probability for the sample point in question being the target device'"'"'s location; and
a distance function between the sample point in question and the target device'"'"'s estimated location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A location-estimating apparatus for estimating a target device'"'"'s location, wherein the target device is operable to move in a wireless environment and to communicate with the wireless environment using signals each of which has at least one measurable signal value;
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the location-estimating apparatus comprising;
a probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several sample points in the wireless environment;
means for making or receiving a set of observations of signal values in the wireless environment at the target device'"'"'s location;
means for estimating the target device'"'"'s location based on the probabilistic model and the set of observations;
means for determining an error estimate of the target device'"'"'s estimated location as a combination of products over several sample points, each product comprising;
a probability for the sample point in question being the target device'"'"'s location; and
a distance function between the sample point in question and the target device'"'"'s estimated location. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification