| Popis: |
This paper presents the results of analyzing the error in calculating the mobile subscriber coordinates using three Wi-Fi access points, where the calculation is based on measuring the received signal power. The purpose of the study was to develop a geopositioning system for large storage facilities and to evaluate the accuracy of the calculations. The principles of local and global positioning, based on the measurement of various signal propagation physical characteristics, were considered, the method for the geopositioning system implementation was selected. The authors have developed a test bench layout of the IEEE 802.11 mobile network geolocation and a software product for solving this problem using the trilateration mechanism. A parameter for the imitation of the additive white Gaussian noise was added to the calculation formulas to emulate a real electromagnetic environment. Graphical relationships between the object coordinates measurement error, the channel’s signal-to-noise ratio and the distance from the reference access point were obtained in the course of the work. The results showed that, even in the worst operating conditions, the developed system is superior to most systems on the market in terms of measurement accuracy. |
