Angle-of-arrival reception for optical wireless location technology

Area of Science:

• Optoelectronics
• Indoor Positioning Systems
• Wireless Communication

Background:

• Accurate indoor positioning remains a challenge for many applications.
• Existing optical positioning methods, such as received signal strength (RSS), suffer from inaccuracies due to power and alignment variations.
• Angle-of-arrival (AOA) sensing offers a potential solution for robust optical positioning.

Purpose of the Study:

• To introduce and evaluate a novel optical wireless location (OWL) system for high-accuracy indoor positioning.
• To characterize the angle-of-arrival (AOA) error in optical indoor positioning.
• To compare the performance of optical AOA positioning against optical received signal strength (RSS) positioning.

Main Methods:

• Development of an optical wireless location (OWL) system utilizing a mobile photoreceiver with photodiodes in a corner-cube configuration.
• Measurement of angle-of-arrival (AOA) bearings from an optical beacon grid using differential photocurrent sensing.
• Empirical characterization of AOA error and performance comparison between AOA and RSS positioning methods.

Main Results:

• The optical AOA positioning method demonstrates inherent robustness against optical beacon power and alignment imbalances.
• The OWL system achieved a mean 3-dimensional positioning error of only 5 cm.
• Optical AOA positioning significantly outperforms optical RSS positioning in terms of accuracy.

Conclusions:

• Optical AOA positioning presents a fundamental advantage for indoor localization, offering superior accuracy and robustness.
• The developed OWL system demonstrates the feasibility of achieving centimeter-level 3D positioning accuracy using optical AOA.
• Future research should explore further experimental designs and prospects for optical AOA positioning systems.