Tracking of multiple moving sources using recursive EM algorithm

Authors:
Pei-Jung Chung;Johann F. Böhme;Alfred O. Hero
Affiliations:
Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI;Signal Theory Group, Department of Electrical Engineering and Information Science, Ruhr-University of Bochum, Bochum, Germany;Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2005

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Abstract

We deal with recursive direction-of-arrival (DOA) estimation of multiple moving sources. Based on the recursive EM algorithm, we develop two recursive procedures to estimate the time-varying DOA parameter for narrowband signals. The first procedure requires no prior knowledge about the source movement. The second procedure assumes that the motion of moving sources is described by a linear polynomial model. The proposed recursion updates the polynomial coefficients when a new data arrives. The suggested approaches have two major advantages: simple implementation and easy extension to wideband signals. Numerical experiments show that both procedures provide excellent results in a slowly changing environment. When the DOA parameter changes fast or two source directions cross with each other, the procedure designed for a linear polynomial model has a better performance than the general procedure. Compared to the beamforming technique based on the same parameterization, our approach is computationally favorable and has a wider range of applications.