Uncertainty-Sensitive Heterogeneous Information Fusion
Assessing Threat with Soft, Uncertain, and Conflicting Evidence
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An element of thwarting terrorist attacks is observing suspicious individuals over time with such diverse means as scanners and other devices, travel records, behavioral observations, and intelligence sources. Such observations provide data that are often both complex and "soft" — i.e., qualitative, subjective, fuzzy, or ambiguous — and also contradictory or even deceptive. Analysts face the challenge of heterogeneous information fusion — that is, combining such data to form a realistic assessment of threat. This report presents research on various heterogeneous information fusion methods and describes a research prototype system for fusing uncertainty-sensitive heterogeneous information. The context is counterterrorism, for both military and civilian applications, but the ideas are also applicable in intelligence and law enforcement.
Table of Contents
Chapter One
Introduction
Chapter Two
Concepts, Methods, and a Research Platform
Chapter Three
Creating Synthetic Data: Vignettes for Testing
Chapter Four
Simple and Bayesian Fusion Methods
Chapter Five
The Maximum Entropy/Minimum Penalty Fusion Method
Chapter Six
Illustrative Analysis
Chapter Seven
Conclusions and Recommendations
Appendix A
Defining Threat
Appendix B
A Factor-Tree Model for Propensity for Terrorism (PFT)
Appendix C
Extending Elementary Bayes Updating
Research conducted by
This research was sponsored by the Office of Naval Research and conducted within the International Security and Defense Policy Center of the RAND National Defense Research Institute, a federally funded research and development center sponsored by the Office of the Secretary of Defense, the Joint Staff, the Unified Combatant Commands, the Navy, the Marine Corps, the defense agencies, and the defense Intelligence Community.
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