An Adaptive Bluetooth Low Energy Positioning System with Distance Measurement Compensation
In recent years, smart phones are widely used in indoor positioning services, making the indoor positioning accuracy increasingly important. However, most of existing positioning technologies have high errors or require some extra special hardware. This study proposes an algorithm to change the environmental attenuation factor and compensation mechanism according to the current situation of the environment, and reduce the signal anomaly caused by the decrease of positioning accuracy. To ensure the positioning system has a certain positioning accuracy to achieve system efficiency, the method consists of three stages: First of all, calculate the current environmental attenuation factor by distance. Secondly, compensate the lack of signal distance according to the compensation mechanism. Finally, the triangulation method and the revised signal are used to locate. The experimental results show that the average positioning error of the proposed method is less than 0.5 m, which is better than some of the existing positioning methods, and provides accuracy and practicality to the positioning system.
KeywordsIndoor positioning Attenuation factor Compensation mechanism
This study was supported by the Ministry of Science and Technology (No. MOST 105-2221-E-324-009-MY2) of Taiwan.
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