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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Pseudorange Measurement Method Based on AIS Signals.

Jingbo Zhang1, Shufang Zhang2, Jinpeng Wang3

  • 1Information Science and Technology College, Dalian Maritime University, Dalian 116026, China. zhang_jingbo@dlmu.edu.cn.

Sensors (Basel, Switzerland)
|May 23, 2017
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Summary
This summary is machine-generated.

This study presents a novel pseudorange measurement solution using the Automatic Identification System (AIS) for enhanced navigation. The developed method improves accuracy in low signal conditions, offering reliable positioning for maritime applications.

Keywords:
AIS-R modeGaussian basebandoptimal estimationpseudorange measurementtimestamp detection

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Area of Science:

  • Maritime Navigation Technology
  • Signal Processing
  • Geodesy

Background:

  • Existing Automatic Identification System (AIS) capabilities are limited for precise navigation and positioning.
  • Accurate pseudorange measurements are crucial for effective maritime navigation and positioning services.

Purpose of the Study:

  • To develop a complete pseudorange measurement solution utilizing the existing AIS infrastructure.
  • To enhance the accuracy of AIS-based navigation and positioning services, particularly under challenging signal conditions.

Main Methods:

  • Mathematical analysis of AIS signals to identify timestamps from bit-0-phases.
  • Monte Carlo simulations to compare zero-crossing and differential peak timestamp detection methods in additive white Gaussian noise (AWGN) channels.
  • An optimal estimation method based on minimum mean square error and α difference filter for fusing detection results, considering low-speed and low-dynamic ship motion.

Main Results:

  • The proposed algorithm significantly improves pseudorange estimation accuracy in low signal-to-noise ratio (SNR) environments.
  • Field tests validated the scheme, demonstrating pseudorange measurement accuracy better than 28 m (σ).
  • The solution achieves high accuracy without requiring modifications to the existing AIS system.

Conclusions:

  • The developed pseudorange measurement solution effectively leverages AIS for enhanced navigation and positioning.
  • The method offers a cost-effective and accurate positioning enhancement for maritime applications.
  • The approach is robust under low SNR conditions, making it suitable for real-world maritime scenarios.