Doppler compensation in underwater channels using time-reversal arrays

This work addresses the problem of compensating for differential Doppler shifts due to source motion in a time-reversal mirror. Time reversal is a feedback wave focusing technique that can be used in poorly-characterized media, and is quite appealing in bidirectional underwater communications as it...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03) Jg. 5; S. V - 81
Hauptverfasser: Gomes, J., Barroso, V.
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: IEEE 2003
Schlagworte:
Delay
Dispersion
Doppler shift
Feedback
Fluctuations
Mirrors
Pulse shaping methods
Shape
Transducers
Underwater communication
ISBN:9780780376632, 0780376633
ISSN:1520-6149
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:This work addresses the problem of compensating for differential Doppler shifts due to source motion in a time-reversal mirror. Time reversal is a feedback wave focusing technique that can be used in poorly-characterized media, and is quite appealing in bidirectional underwater communications as it allows multipath to be transparently canceled in highly dispersive channels. Under simplifying assumptions, it is shown that time-reversed focusing occurs even when the source moves uniformly, although this induces fluctuations in the envelope of the regenerated signal due to differential Doppler. The proposed technique for Doppler compensation builds on the representation of time-varying pulse shapes using delay-Doppler spread functions. By inverting these functions in both delay and Doppler at each transducer, the mirror is able to project signals that converge on the source and are devoid of Doppler shifts when observed in its moving reference frame.
ISBN:9780780376632
0780376633
ISSN:1520-6149
DOI:10.1109/ICASSP.2003.1199873