Small‐Size, Low‐Frequency Utility Source for Underwater Acoustic Measurements

Array Processing: Underwater Acoustic Source Localization

Simulation of Underwater Networks with KAM08 Acoustic Channel Measurements

The performance of underwater acoustic networks (UWANs) suffers from multipath and fast channel fluctuation, which severely limit the capacity of acoustic channels. Due to both logistic and technical difficulties of deploying UWANs for realistic scenarios, research involving UWANs has always been limited to either theoretical analysis or simulation study. For simulation, however, there are few ...

Impact of source depth on coherent underwater acoustic communications.

A recent paper [Song et al., J. Acoust. Soc. Am. 123, 856-865 (2008)] investigated ocean variability impact on coherent underwater acoustic communications (8-16 kHz) for a single near-seafloor transmitter in shallow water during an extended period (27 h). This letter extends that investigation to various source depths and receiver subarrays. Specifically, the middle water column source, which i...

Target Localization in Underwater Acoustic Sensor Networks Using RSS Measurements

This paper addresses the target localization problems based on received signal strength (RSS) measurements in underwater acoustic wireless sensor network (UWSN). Firstly, the problems based on the maximum likelihood (ML) criterion for estimating target localization in cases of both known and unknown transmit power are respectively derived, and fast implementation algorithms are proposed by tran...

Acoustic Emission Sensor Calibration for Absolute Source Measurements

This paper describes sensor calibration and signal analysis techniques applicable to the method of acoustic emission (AE) and ultrasonic testing. They are particularly useful for obtaining absolute measurements of AE wave amplitude and shape, which can be used to constrain the physics and mechanics of the AE source. We illustrate how to perform calibration tests on a thick plate and how to impl...