Abstract
In this paper, we analyze the phenomena and problems that can occur in the sensor node localization of optics-based sensor networks using MEMS (Micro Electro Mechanical Systems) CCR (Corner Cube Retro-reflector). CCR reflects incident rays back in the opposite direction to calculate the distance between the sensor node and the base station and measuring the difference in source and sink detection time. The sensor node position can be measured from the ToF (Time of Flight) and the AoA (Angle of Arrival). However, when the MEMS CCR is used, reflected ray’s power is not strong enough to be detected. In the optics-based sensor network, sensor nodes are distributed randomly. Some sensor nodes cannot be detected due to the rectilinear propagation characteristics of light. To overcome these problems, we analyze the reflected ray’s power and verify the results experimentally. Based on the analysis, we replaced the photo detector to increase the detectable range. We also showed that multiple base stations can solve the randomly distributed sensor node issue and improve sensor node localization.
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