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Graduate Exam Abstract


Patricia Barbosa

Ph.D. Preliminary

August 2, 2007, 2pm

Engr C101B

Target Tracking with Distributed Sensing: Information-Theoretic Bounds, and the Integration with Imaging and


Abstract: This dissertation addresses both theoretical and practical aspects of target tracking in a distributed sensing environment. First we consider the problem of tracking a target that moves according to a Markov chain in a sensor network. We provide necessary and sufficient conditions on the number of queries per time step to track in three different scenarios: (1) the tracker is required to know the exact location of the target at each time step; (2) the tracker may lose track of the target at a given time step, but it is able to ``catch-up," regaining up-to-date information about the target's track; (3) tracking information is only known by the tracker after a delay of d time steps. We then address the inherent issues to multitarget tracking in urban terrains and the development of techniques and algorithms that mitigate or eliminate this issues. In order to improve the accuracy of track estimates under such complex scenarios, it is important to use prior knowledge of the environment. We investigate the integration of detection, signal processing, tracking, and scheduling by exploiting distinct levels of diversity: (1) spatial diversity through the use of coordinated multistatic radars; (2) waveform diversity by adaptively scheduling the transmitted radar waveform according to the scene conditions; and (3) motion model diversity by using a bank of parallel filters, each one matched to a different maneuvering model. Finally, the resource allocation problem is considered. In particular, we propose a two-level scheduling scheme that selects waveforms and their transmitters for target tracking. The lower-level scheduler selects waveforms to be transmitted at every radar scan, and it is implemented as a round-robin or a myopic algorithm for fast processing. At the top level, a non-myopic sensor scheduler selects which transmitters should be active. While new waveform scheduling decisions are taken at each radar scan, sensor scheduling decisions remain in operation until the overall tracking accuracy falls below a certain threshold, or a detection risk is exceeded, defined by the number of consecutive scans a transmitter is active.

Adviser: E. K. P. Chong
Co-Adviser:
Non-ECE Member: J. Hannig (Statistics)
Member 3: J. R. Luo
Addional Members:

Publications:


Program of Study: