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An Improved Positioning Method for Two Base Stations in AIS.

Yi Jiang1, Jiani Wu2, Shufang Zhang3

  • 1Key Laboratory of Intelligent Waterway Transport Ministry of Transport, Information Science and Technology College, Dalian Maritime University, Dalian 116026, China. j_y@dlmu.edu.cn.

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Summary
This summary is machine-generated.

This study introduces an improved method for vessel positioning using Automatic Identification System (AIS) R-Mode, enhancing accuracy even with limited base stations. The new approach utilizes adaptive motion models for more reliable terrestrial navigation backup.

Keywords:
accelerated motionautomatic identification system (AIS)displacement correction position estimation (DCPE)turning motion

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Area of Science:

  • Maritime technology
  • Navigation systems
  • Geomatics engineering

Background:

  • Resilient position, navigation, and timing (PNT) data is crucial for e-navigation.
  • Global Navigation Satellite System (GNSS) vulnerability necessitates terrestrial backup systems.
  • Automatic Identification System (AIS) based Ranging Mode (R-Mode) offers a terrestrial backup solution.

Purpose of the Study:

  • To propose an improved position estimation method for AIS R-Mode.
  • To address limitations of traditional R-Mode with insufficient base station geometry.
  • To enhance positioning accuracy for vessels using AIS R-Mode.

Main Methods:

  • Development of an improved displacement correction position estimation (DCPE) method.
  • Incorporation of adaptive, precise vessel motion models (accelerated and turning motion).
  • Simulation-based verification and performance analysis of the proposed method.

Main Results:

  • The proposed method significantly improves positioning accuracy compared to prior DCPE.
  • Adaptive motion models effectively correct vessel displacement.
  • The enhanced method extends the applicability of AIS R-Mode.

Conclusions:

  • The improved AIS R-Mode position estimation method offers a more robust terrestrial navigation backup.
  • Accurate motion modeling is key to overcoming geometric limitations in R-Mode positioning.
  • This research enhances the reliability and reach of AIS R-Mode for maritime navigation.