System and method for determining the location of emitters having well-behaved timing features
First Claim
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1. A method for determining the location of an emitter, comprising:
- selecting a first subset of a plurality of parameters comprising a signal model associated with the emitter;
estimating values for the selected first subset of the plurality of parameters from a plurality of time of arrival measurements associated with the emitter and the signal model, the estimation of the selected first subset of the plurality of parameters comprising;
defining a fitness surface from the selected first subset of the plurality of parameters and the signal model;
locating local extrema on the fitness surface;
refining the location of the local extrema to determine at least one candidate solution for the estimated values for the first subset of the plurality of parameters; and
selecting the candidate solution having the best fitness; and
generating estimated values for the plurality of parameters according to the estimated values for the selected first subset of the plurality of parameters, a plurality of time of arrival measurements, and the signal model.
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Abstract
A method, system, and computer program product are provided for determining the location of an emitter. A first subset of a plurality of parameters comprising a signal model associated with the emitter is selected. Values are estimated for the selected first subset of the plurality of parameters from a plurality of time of arrival measurements associated with the emitter and the signal model. Estimated values are generated for the plurality of parameters according to the estimated values for the selected first subset of the plurality of parameters, a plurality of time of arrival measurements, and the signal model.
57 Citations
19 Claims
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1. A method for determining the location of an emitter, comprising:
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selecting a first subset of a plurality of parameters comprising a signal model associated with the emitter; estimating values for the selected first subset of the plurality of parameters from a plurality of time of arrival measurements associated with the emitter and the signal model, the estimation of the selected first subset of the plurality of parameters comprising; defining a fitness surface from the selected first subset of the plurality of parameters and the signal model; locating local extrema on the fitness surface; refining the location of the local extrema to determine at least one candidate solution for the estimated values for the first subset of the plurality of parameters; and selecting the candidate solution having the best fitness; and generating estimated values for the plurality of parameters according to the estimated values for the selected first subset of the plurality of parameters, a plurality of time of arrival measurements, and the signal model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A computer program product, operative in a data processing system and implemented on a computer readable medium, for determining the location of an emitter having well-behaved timing features from a plurality of time of arrival measurements associated with the emitter comprising:
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a parameter selector that selects a first subset of a plurality of parameters comprising a signal model associated with the emitter; a parameter estimator that estimates values for the selected first subset of the plurality of parameters from the plurality of time of arrival measurements and the signal model; and a parameter evaluator that evaluates the estimated parameter values and directs the parameter selector to select a second, larger subset of the plurality of parameters if an error value associated with the estimation of the first subset meets a threshold value and directs the parameter evaluator to estimate the parameters using at least one additional time of arrival measurement if the error value does not meet a threshold value. - View Dependent Claims (14, 15)
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16. A method for determining the location of an emitter, comprising:
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estimating a plurality of parameters for a signal model associated with the emitter from a plurality of time of arrival measurements associated with the emitter and the signal model; defining a Fisher Information Matrix associated with the step of estimating the plurality of parameters; defining a scaling matrix in which the diagonal elements have values equal to the square root of the corresponding values in the Fisher Information Matrix; producing a scaled representation of the Fisher Information Matrix using the scaling matrix; and inverting the scaled representation of the Fisher Information Matrix. - View Dependent Claims (17, 18, 19)
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Specification