Method and apparatus for determining accuracy of the estimated location for a target in a wireless system
First Claim
1. A method for determining accuracy of an estimated location of a target device in a wireless system by using an apparatus having computing and storage devices, said method comprising the steps of:
- determining a location probability density function of said target device using said computing device based on a location probability model stored in said storage device, said location probability model indicating the location probability density function of said target device when a received radio signal from said target device is known;
calculating an uncertainty at a current estimated location and a possible maximum uncertainty using said computing device based on radio signals received by said target device according to said location probability density function; and
calculating a confidence index of said current estimated location using said computing device based on said uncertainty and said maximum uncertainty by computing an uncertainty quantity defined as a ratio of said uncertainty to said maximum uncertainty and computing said confidence index as a function of said uncertainty quantity;
wherein said confidence index of said current estimated location determines the accuracy of said current estimated location with higher confidence index representing higher accuracy.
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Abstract
A method for determining the accuracy of the estimated position for a target device in a wireless system includes the computation of a confidence index. In the online location determining phase, after knowing the observations of the radio signal for a target device, the target device'"'"'s probability distribution of location and its motion model are combined to calculate the position uncertainty, thereby giving the confidence index of this location estimate. The invention determines the location probability distribution, and calculates the uncertainty of the location probability distribution and the possible maximum uncertainty under the current situation. Based on these uncertainties, this invention determines the confidence index of the radio signal. The confidence may be regarded as a quantity that the location uncertainty can be excluded in the location prediction.
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Citations
20 Claims
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1. A method for determining accuracy of an estimated location of a target device in a wireless system by using an apparatus having computing and storage devices, said method comprising the steps of:
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determining a location probability density function of said target device using said computing device based on a location probability model stored in said storage device, said location probability model indicating the location probability density function of said target device when a received radio signal from said target device is known; calculating an uncertainty at a current estimated location and a possible maximum uncertainty using said computing device based on radio signals received by said target device according to said location probability density function; and calculating a confidence index of said current estimated location using said computing device based on said uncertainty and said maximum uncertainty by computing an uncertainty quantity defined as a ratio of said uncertainty to said maximum uncertainty and computing said confidence index as a function of said uncertainty quantity; wherein said confidence index of said current estimated location determines the accuracy of said current estimated location with higher confidence index representing higher accuracy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus having computing and storage devices configured for determining accuracy of an estimated location of a target device in a wireless system, said apparatus comprising:
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a probability density function generator configured with said computing device for generating a location probability density function for said target device based on a location probability model stored in said storage device, said location probability model indicating the location probability density function of said target device when a received radio signal from said target device is known; an uncertainty computation module configured with said computing device for calculating an uncertainty at a current estimated location and a possible maximum uncertainty based on radio signals received by said target device according to said location probability density function; and a confidence index computing module configured with said computing device for calculating a confidence index of said current estimated location based on said uncertainty and said maximum uncertainty by computing an uncertainty quantity defined as a ratio of said uncertainty to said maximum uncertainty and computing said confidence index as a function of said uncertainty quantity; wherein said confidence index of said current estimated location determines the accuracy of said current estimated location with higher confidence index representing higher accuracy. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification