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An Absorption Mitigation Technique for Received Signal Strength-Based Target Localization in Underwater Wireless

Xiaojun Mei1,2, Huafeng Wu1, Nasir Saeed3

  • 1Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China.

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|August 23, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a robust localization method for underwater wireless sensor networks (UWSNs) that mitigates acoustic signal absorption loss. The developed absorption mitigation technique (AMT) improves localization accuracy in challenging marine environments.

Keywords:
absorption mitigation technique (AMT)localizationmin–max strategyreceived signal strength (RSS)robust localization algorithmunderwater wireless sensor networks (UWSNs)

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Area of Science:

  • Engineering
  • Computer Science
  • Marine Technology

Background:

  • Accurate localization is crucial for underwater wireless sensor networks (UWSNs) supporting marine applications, routing, and topology control.
  • Received Signal Strength (RSS)-based localization is cost-effective and synchronization-free but degraded by underwater acoustic signal absorption loss.
  • Existing RSS-based methods struggle with accuracy in UWSNs due to environmental signal attenuation.

Purpose of the Study:

  • To develop a robust localization method for UWSNs that overcomes the limitations of RSS-based schemes.
  • To introduce an absorption mitigation technique (AMT) to enhance localization accuracy in underwater environments.
  • To provide a computationally tractable solution for non-convex optimization problems in UWSN localization.

Main Methods:

  • An analytically tractable RSS-based measurement model with Maximum Likelihood Estimator (MLE) was formulated.
  • A min-max strategy was employed to address the non-convex optimization problem involving absorption loss.
  • The problem was framed as a generalized trust region sub-problem (GTRS) solved via an iterative method.
  • The Cramer-Rao Lower Bound (CRLB) for the measurement model was derived.

Main Results:

  • The proposed absorption mitigation technique (AMT) effectively addresses signal absorption loss in UWSNs.
  • The developed iterative method provides a solution for the non-convex GTRS localization problem.
  • Numerical simulations validated the method's effectiveness compared to state-of-the-art approaches.
  • The derived CRLB offers a benchmark for localization accuracy.

Conclusions:

  • The novel robust localization method significantly improves accuracy in UWSNs by mitigating absorption loss.
  • The absorption mitigation technique (AMT) enhances the viability of RSS-based localization in challenging underwater conditions.
  • This research offers a practical and effective solution for UWSN localization, advancing marine technology applications.