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Acoustic model-based matched filter processing for fading time-dispersive ocean channels: theory and experiment

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2 Author(s)
Hermand, J.-P. ; Fac. of Appl. Sci., Brussels Univ., Belgium ; Roderick, W.I.

It is shown that the performance of a conventional matched filter can be improved if the reference (replica) channel compensates for the distortion by the ocean medium. A model-based matched filter is generated by correlating the received signal with a reference channel that consists of the transmitted signal convolved with the impulse response of the medium. The channel impulse responses are predicted with a broadband propagation model using in situ sound speed measured data and archival bottom loss data. The relative performance of conventional and model-based matched filter processing is compared for large time-bandwidth-product linear-frequency-modulated signals propagating in a dispersive waveguide. From ducted propagation measurements conducted in an area west of Sardinia, the model-based matched filter localizes the depths of both the source and receiving array and the range between them. The peak signal-to-noise ratio for the model-based matched filter is always larger than that of the conventional filter

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Oceanic Engineering, IEEE Journal of  (Volume:18 ,  Issue: 4 )