Browse by author
Lookup NU author(s): Ben Sherlock
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
© 2025, I.A.C.M, Foundation for Research and Technology-Hellas. All rights reserved.The aim of this work is to investigate the target detection performance of a distributed underwater acoustic (UWA) communication network with lake experimental data. In recent work, a target detection algorithm was proposed based on measurement of the time-varying channel impulse response (CIR) between a communication transmitter and receiver. The detector computes the normalized mean squared deviation (MSD) between a CIR of interest and a set of reference CIRs (estimated when the target is absent) and uses the minimum normalized MSD (nMSD) as the statistic for target detection. Before computing the nMSD, a filter is applied to the CIR to compensate for the change in delay and amplitude caused by environmental factors, such as node drift or moving surface waves. The performance of the detector was investigated in a small-scale lake experiment and showed clear indication of the target crossing the communication link. In this work, we improve the detector performance in fast-varying channels by updating the reference CIRs in time. The detection threshold is also time-varying and is computed using the current set of reference CIRs and a predefined false alarm rate. Instead of using the minimum nMSD, we exploit information from all nMSDs and make the detection decision by computing the probability of potential target crossing (percentage of nMSDs higher than the detection threshold). The performance of the new detector is investigated in an UWA network with nine communication links. Results show clear indication of target detection and a significant reduction of false alarms, compared to the previous work.
Author(s): Shen L, Zakharov Y, Henson B, Morozs N, Sherlock B, Mitchell PD
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Underwater Acoustic Conference and Exhibition Series (UACE 2025)
Year of Conference: 2025
Pages: 497-504
Online publication date: 15/06/2025
Acceptance date: 02/04/2018
Publisher: I.A.C.M, Foundation for Research and Technology - Hellas
URL: https://www.uaconferences.org/
