Probabilistic model for a positioning technique
First Claim
1. A method 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;
- the method comprising;
forming a plurality of submodels of the wireless environment, each submodel indicating a probability distribution for signal values at one or more locations in the wireless environment;
combining the submodels to a probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several locations in the wireless environment;
making a set of observations of signal values in the wireless environment at the target device'"'"'s location; and
estimating the target device'"'"'s location based on the probabilistic model and the set of observations.
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Abstract
A model construction module (MCM) for constructing a probabilistic model (PM) of a wireless environment (RN) in which a target device (T) communicates using signals that have a measurable signal value (x), such as signal strength. The model construction module forms several submodels (611-631) of the wireless environment (RN). Each submodel indicates a probability distribution (F1-F3) for signal values at one or more locations (Q1-QY) in the wireless environment. The module combines the submodels to a probabilistic model (PM) of the wireless environment (RN), such that the probabilistic model indicates a probability distribution for signal values at several locations in the wireless environment. Alternatively, the model may insert new locations to a single model based on a combination of existing locations. The combination of submodels or existing locations comprises combining the inverse cumulative distribution functions of the submodels or existing locations.
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Citations
19 Claims
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1. A method 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 method comprising;
forming a plurality of submodels of the wireless environment, each submodel indicating a probability distribution for signal values at one or more locations in the wireless environment;
combining the submodels to a probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several locations in the wireless environment;
making a set of observations of signal values in the wireless environment at the target device'"'"'s location; and
estimating the target device'"'"'s location based on the probabilistic model and the set of observations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
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11. A method 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 method comprising;
forming a probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several locations in the wireless environment;
inserting into the probabilistic model a probability distribution for a new location, wherein the inserting step comprises combining probability distributions for existing locations;
making a set of observations of signal values in the wireless environment at the target device'"'"'s location; and
estimating the target device'"'"'s location based on the probabilistic model and the set of observations. - View Dependent Claims (12, 13)
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15. A model construction module for constructing a probabilistic model of a wireless environment in which a target device is operable to communicate using signals each of which has at least one measurable signal value;
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the model construction module comprising;
a first software code portion for forming a plurality of submodels of the wireless environment, each submodel indicating a probability distribution for signal values at one or more locations in the wireless environment; and
fora second software code portion for combining the submodels to a probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several locations in the wireless environment. - View Dependent Claims (16, 17, 19)
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18. A model construction module for constructing a probabilistic model of a wireless environment in which a target device is operable to communicate using signals each of which has at least one measurable signal value;
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the model construction module comprising;
a first software code portion for forming probabilistic model of the wireless environment, the probabilistic model indicating a probability distribution for signal values at several locations in the wireless environment;
a second software code portion for inserting into the probabilistic model a probability distribution for a new location, wherein the inserting step comprises combining probability distributions for existing locations.
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Specification