Μελέτη διάδοσης θαλάσσιων σημάτων σε υποθαλάσσιο περιβάλλον

Τσίγαλος, Χρυσοβαλάντης

Master Thesis

Author

Τσίγαλος, Χρυσοβαλάντης

Date

2026-04

Abstract

The subject of this thesis is the study and computational simulation of underwater acoustic propagation in medium-depth environments, with the aim of optimizing communication in underwater sensor networks. Sound transmission in the marine environment presents significant challenges, such as the variation of propagation speed depending on depth, temperature and pressure, causing strong diffraction phenomena. At the same time, reflections on the bottom and the surface introduce energy losses and multipath phenomena that make data acquisition difficult. The research was carried out using the BELLHOP ray tracing model, using the arlpy library in a Python environment. The simulation focused on a 1000-meter-deep sea channel, where three different transmitter placement scenarios were examined at depths of 50m, 150m, 200m and 300m. The results were analyzed through Ray Plots and Transmission Loss maps. The analysis of the data showed that the existence of an acoustic conduit at a depth of 300 meters, where the speed is minimal, is the most critical factor for efficient communication. The acoustic rays are trapped in the conduit due to refraction, avoiding reflections on the bottom and maintaining the signal strength over long distances. In contrast, transmission from shallower depths leads to rapid attenuation and the creation of shadow zones. The findings of the work provide valuable guidance for the geometric design of underwater networks, highlighting the importance of optimizing energy autonomy and link reliability for effective underwater communication.

Postgraduate Studies Programme

ΔΠΜΣ στη Διοίκηση στη Ναυτική Επιστήμη και Τεχνολογία

Department

Σχολή Ναυτιλίας και Βιομηχανίας. Τμήμα Ναυτιλιακών Σπουδών

Corporate Department

Σχολή Ναυτικών Δοκίμων

Number of pages

Language

Greek

URI

https://dione.lib.unipi.gr/xmlui/handle/unipi/19229

Collections

Τμήμα Ναυτιλιακών Σπουδών

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Except where otherwise noted, this item's license is described as
Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα