Browsing by Author "Quinquis, A."
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- A time-frequency approach to blind deconvolution in multipath underwater channelsPublication . Martins, N.; Jesus, S. M.; Gervaise, C.; Quinquis, A.Blind deconvolution is presented in the underwater acoustic channel context, by time-frequency processing. The acoustic propagation environment was modelled as a multipath propagation channel. For noiseless simulated data, source signature estimation was performed by a model-based method. The channel estimate was obtained via a time-frequency formulation of the conventional matched-filter. Simulations used a ray-tracing physical model, initiated with at-sea recorded environmental data, in order to produce realistic underwater channel conditions. The quality of the estimates was 0.793 for the source signal, and close to I for the resolved amplitudes and time-delays of the impulse response. Time-frequency processing has proved to overcome the typical ill-conditioning of single sensor deterministic deconvolution techniques.
- Time-frequency approach to multipath underwater channel deconvolutionPublication . Martins, N.; Jesus, S. M.; Gervaise, C.; Quinquis, A.Blind deconvolution is presented in the underwater acoustic channel context, by time-frequency processing. The acoustic propagation environment was modelled as a multipath propagation channel. For noiseless simulated data, source signature estimation was performed by a model-based method. The channel estimate was obtained via a time-frequency formulation of the conventional matched-filter. Simulations used a ray-tracing physical model, initiated with at-sea recorded environmental data, in order to produce realistic underwater channel conditions. The quality of the estimates was 0.793 for the source signal, and close to 1 for the resolved amplitudes and time-delays of the impulse response. Time-frequency processing has proved to overcome the typical ill-conditioning of single sensor deterministic deconvolution techniques.
- Time-frequency approach to the study of underwater acoustic channel estimation and source reconstructionPublication . Gervaise, C.; Quinquis, A.; Martins, N.This communication presents a pre-processing scheme possibly included in the global methodology of passive tomography, in an underwater acoustic channel.