Summary

1. Summary Alan S. Willsky SensorWeb MURI Review Meeting September 22, 2003

2. An Update to the 2.5-Year Summary • Last year’s review provided a complete picture of the state of this MURI • Scientific achievement • Fulfilling the intellectual agenda outlined in our proposal • Achieving objectives of MURI programs • Interdisciplinary and synergistic research • Community leadership and influence • Responsiveness to EAC/TAB and contributions to critical DoD S&T challenges • The following is a brief update, based on what has been presented in the previous talks

3. Fulfilling the intellectual agenda outlined in our proposal • We have maintained course along all three intellectual themes defined in our proposal • Focus primarily on intellectual “long-poles” • Maintaining relevance to and coverage of the RCA’s, • We continue to have considerable success • Major research results • Recognition of our work by the broader community

4. A Sampling of Recent Accomplishments & Activities • New, robust methods for source localization with sensor arrays • New methods with enhanced robustness to noise and uncertainty • Well-adapted to signal structures arising in applications of central interest to the Army but which previous methods have not addressed (e.g., multiband sources) • Ongoing interaction with ARL to maintain and enhance relevance and impact of this work, e.g. • Distributed sources • Sources with harmonic structure

5. Sampling - II • Fusion of heterogeneous sensors • Robust information-theoretic methods for multisensor fusion • New approaches for • Estimating information measures • Overcoming combinatorial explosion of data association • Initiation of ARL collaboration via extended visit by Alex Ihler • Multisensor association,fusion and exploitation • Marriage of received signal strength work of Sadler/Pham and our NBP methods • New information-theoretic approach to sensor management and querying in networked environments

6. Sampling - III • Network-constrained fusion • Exploitation of embedded tractable structures • Embedded tree algorithms • Extended message passing algorithms • Tree-reweighting optimization • Extension of particle filtering to networks • Collaboration with CTA-funded research (Moses-OSU) on source and sensor localization • Applications to distributed data association • Investigation of performance/communication tradeoff • Newly initiated formulation capturing simple proximity sensor models • New approach using particle filters avoiding data association complexity completely

7. Sampling - IV • Methods and guarantees for exploiting heterogeneous sensors • Principles, methods, and guarantees for estimation, association and discrimination • Collaborative use of fragmented data • Dynamic, adaptive resource allocation with performance guarantees • PAC-learning-based approach to bounds on number of information queries required to make decision/estimate with specified level of confidence • Universal prediction approach to sequential resource allocation with application to energy management in wireless networks

8. Sampling - V • Information transfer in wireless networks for distributed sensing and control • Problems at the interface of sensing, inference, communication, and computation • Results on harvesting statistics from sensor networks: relating fusion rate to network strategies • Optimal use of energy-limited nodes in networks with fading channels

9. Sampling - VI • Integrated approaches to communications-constrained fusion • Intelligent querying of sensors for localization and tracking of targets • Transitioned through SensIT program • Continuing collaboration (through Dr. M Chu, now at PARC) • Initiation of new effort in distributed fusion • Blending concepts from decentralized detection and graphical models • Anticipated collaboration with Prof. P. Varshney (involved in the Battlefield Visualization MURI) • Already have uncovered major conceptual issues

10. Sampling - VII • Recognition of our work continues • New plenary and invited talks • Numerous papers and theses • We continue to strengthen our interactions with other research activities • Decision-making under uncertainty MURI • Battlefield visualization MURI • Sensors CTA

11. Sampling - VIII • We continue to respond conscientiously to the mission of MURI research • Responsiveness to EAB/TAC comments • See previous talks • Continued and enhanced interactions with ARL (both directly and through collaborative research with those involved in CTAs)