Frequency line tracking using HMM-based schemes [passive sonar] |
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Authors: | Paris S Jauffret C |
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Institution: | Signal Inf. et Systemes Lab., Univ. de Toulon et du Var, La Garde, France; |
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Abstract: | This paper deals with fluctuating line tracking, present on the so-called lofargram (low frequency analysis and recording) encountered in any passive sonar system. Considering such a line as a random walk modeled by a first-order Markov chain, we have recourse to the hidden Markov models (HMMs) arsenal. More precisely, we propose to track a frequency line with Viterbi and forward-backward algorithms. The originality of this work comes from the fact that a "probabilistic integration of the spectral power" approach allows us to construct a signal-to-noise (SNR)-knowledge-free method. Intensive simulations reveal no loss of performance. |
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