This technology is an indoor positioning method and device that determines the reader's location by calculating the medians between the coordinates of the nearest tag recognized by the reader and the coordinates of other recognized tags within a space where RFID tags are arranged at regular intervals along the x and y axes, and then finding the center of gravity of those medians.
While GPS is efficient for outdoor positioning, it is difficult to use indoors, leading to research into RFID-based indoor localization. However, existing indoor positioning methods have limitations, such as accumulated errors during the estimation process and measurement errors caused by ambient signal noise, resulting in significant discrepancies from actual locations.
This technology reduces the error between estimated and actual locations by using the nearest tag as a reference point to calculate medians with other recognized tags and averaging them using a center of gravity formula. It can be applied to tracking inventory and transport equipment in warehouses, as well as managing personnel and assets in hospitals and factories, enabling precise positioning in indoor areas without GPS using only low-cost tag arrays.
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