Resilience and Robustness in Visible Light Positioning Systems: An introductory Approach

Abstract

Indoor positioning systems have emerged from the disadvantages to use conventional satellite signals inside indoor environments. One of them is Visible light positioning (VLP) and it appears as a promising technology in congested or sensitive radiofrequency areas. Positioning methods in VLP can be classified into range-free and range-based. The first class is less sensitive (or more robust) to variations of signal characteristics than the second class. The precision performance of these methods can be evaluated by the positioning error cumulated distribution function and it is often used to prove the robustness of the positioning system. A similar term, resilience, can deliver a recovery state from a system failure caused by disturbances. This paper presents an introductory explanation of the robustness of VLP systems, summarizing the current literature and focusing on how robustness is calculated. In addition, the resilience concept is clarified and differentiated from the robustness in the context of VLP, exposing two different indices to determine it. Finally, we propose a convenient way of using resilience in VLP systems as the main index of disturbance proof.