Modélisation des effets du mouvement dans des configurations multitrajets à l'aide de filtrage retard/doppler basé sur les déformations temporelles
Résumé
The estimation of the impulse response of a propagation channel is necessary for a large number of acoustic applications: underwater communication, detection and localization, etc. Basically, it informs us about the distortions of a transmitted signal in one channel. This operation is usually subject to additional distortions due to the motion of the transmitter channel-receiver configuration. This paper points on the effects of the motion while estimating the IR by matching filtering between the transmitted and the received signals and introduces a new motion compensation method. Knowing the transmitted signal, the apparent speed of each propagation path can be estimated using wideband ambiguity function [2]. Indeed, some interference appears in the wideband ambiguity plane because of the multipath propagation. A warpingbased lag- Doppler filtering method is proposed allowing us to accurately estimate the IR of the channel.
Origine : Fichiers produits par l'(les) auteur(s)
Loading...