Induced Magnetic Field-Based Indoor Positioning System for Underwater Environments.

Area of Science:

• Robotics and Navigation
• Marine Technology
• Sensor Systems

Background:

• Autonomous underwater vehicles (AUV) require accurate short-range positioning for tasks like docking.
• Existing methods (UWB, acoustic, optic) face limitations in underwater environments due to signal absorption, multipath effects, and environmental dependency.
• There is a need for robust, accurate, and cost-effective underwater positioning solutions.

Purpose of the Study:

• To present and evaluate an oscillating magnetic field-based positioning system for both indoor and underwater applications.
• To demonstrate the system's capability to overcome the limitations of conventional positioning techniques in challenging environments.

Main Methods:

• Development of a positioning system utilizing an oscillating magnetic field.
• Testing the system in various indoor environments and underwater conditions.
• Application of multi-lateration positioning techniques for accuracy assessment.

Main Results:

• Achieved a mean underwater positioning accuracy of 13.3 cm in 2D and 19.0 cm in 3D.
• Demonstrated similar accuracy in diverse indoor environments, unaffected by clutter.
• The magnetic field is robust against environmental variations due to similar water and air permeability.

Conclusions:

• The oscillating magnetic field-based positioning technique shows significant potential for underwater applications.
• The system is low-cost, low-power, scalable, and plug-and-play, requiring no pre-calibration.
• This technology offers a viable alternative for high-accuracy positioning of AUVs and other underwater assets.