Miniaturized polarization compass based on a customized vortex retarder and a mini-camera.

Area of Science:

• Robotics and Autonomous Systems
• Navigation and Guidance Technologies
• Optics and Photonics

Background:

• Current polarized skylight navigation systems face challenges with size, cost, and computational complexity.
• Need for robust navigation solutions in GPS-denied environments for unmanned platforms.

Purpose of the Study:

• To design and implement a miniaturized polarized skylight compass (MPSC).
• To address limitations of existing systems in terms of size, cost, and computational demands.
• To provide a practical navigation solution for unmanned platforms.

Main Methods:

• Utilized a customized vortex retarder and a micro-scale camera for spatial polarization modulation and image acquisition.
• Employed an STM32 embedded chip for efficient image processing.
• Implemented a lightweight radial integration algorithm for rapid and precise heading angle determination.

Main Results:

• The MPSC prototype is compact (45mm×35mm×30mm) and lightweight (30g).
• Achieved an output rate of 10 Hz with high accuracy: 0.04° RMSE in static tests and 0.14° RMSE in dynamic tests.
• Demonstrated successful validation through both static and dynamic experiments on an unmanned vehicle platform.

Conclusions:

• The developed MPSC is a robust and practical navigation solution.
• It offers significant advantages in size, cost, and computational efficiency.
• The MPSC shows great potential for unmanned platforms operating in GPS-denied environments.