Fuzzy Logic Based Model Assessment System and Method for Contact Tracking
Patent Application, Filed 10 May 99
DEPARTMENT OF THE NAVY WASHINGTON DC
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A fuzzy logic based model assessment system assesses models of physical phenomena and in one example, is used for contact tracking. The system uses measurement residual values representing the difference between a measured data sequence corresponding to the physical phenomena and an expected data sequence corresponding to the model to be assessed. The system includes a feature identification module for identifying one or more features or tracking anomalies in the measurement residual values, such as jump and drift, and for generating feature amplitude values and feature amplitude standard deviation values. An anomaly characterization module characterizes the features in one or more membership classes representing the strength of the identified feature and generates class membership intervals representing a range of degrees of membership in each of the classes e.g., null, weak, moderate or strong. A hypothesis formulation and evaluation module determines one or more possible causes of mismodeling by applying fuzzy inferencing to the class memberships, and generates hypothesis certainty intervals representing a range of degrees of certainty of the mismodeling hypothesis based on the class membership intervals. A knowledge base of heuristic rules are used to infer the mismodeling hypotheses based upon the membership classes.