Indoor 3D NLOS VLP using a binocular camera and a single LED

Area of Science:

• Optoelectronics
• Indoor Positioning Systems
• Computer Vision

Background:

• Traditional line-of-sight (LOS) visible light positioning (VLP) systems face limitations due to signal blockage.
• Achieving 3D positioning with arbitrary postures requires robust solutions overcoming LOS constraints.
• Limited camera field-of-view restricts the number of visible light transmitters (LEDs) that can be simultaneously detected.

Purpose of the Study:

• To propose and evaluate a non-line of sight (NLOS) VLP system for 3D positioning.
• To address challenges associated with blocked LOS paths and limited receiver field-of-view.
• To introduce a label-based enhanced VLP scheme for improved positioning accuracy.

Main Methods:

• Development of a VLP system utilizing a binocular camera and a single LED.
• Implementation of an experimental testbed for performance evaluation.
• Proposal and integration of a label-based enhanced VLP scheme.

Main Results:

• The initial system achieved an average error of 26.10 cm and RMSE of 31.02 cm after error compensation.
• The label-based enhanced VLP scheme significantly reduced errors, yielding an average error of 7.31 cm and RMSE of 7.74 cm.
• The enhanced scheme demonstrated 90th percentile accuracies below 11 cm.

Conclusions:

• The proposed NLOS VLP system effectively enables 3D positioning even with blocked LOS.
• The label-based enhancement offers a substantial improvement in positioning accuracy and reliability.
• This technology holds promise for applications requiring precise indoor localization without LOS constraints.