Comments: pdf
Ref.: Global OCEANS MTS/IEEE, Chennai (India), February 2022
Abstract:
The use of vector hydrophones as a receiver for underwater communications has been the subject of
research since such device is a compact option to pressure-only arrays. A vector hydrophone,
usually called acoustic vector sensor, is a device that measures pressure and particle velocity
components. This paper investigates a method to combine those channels based on passive
time-reversal (PTR). Simulation and experimental data are used to quantify communication
performance, comparing vector hydrophones to pressure-only arrays. The analyzed acoustic
scenario consists of a shallow-water area (about 100 m), where a vector hydrophone array
receives communication signals from a bottom moored source. Simulations help in the
understanding of diversity by analyzing spectral characteristics of vector hydrophone
channels and the PTR q-function. While in simulation, the benefits of PTR using particle
velocity channels are perceptible seen by exploring diversity, communication performance
with experimental data is degraded due to time-varying. Finally, the achieved performance
using a single or a small array of vector hydrophones enforces its benefits for communication
enhancement.
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