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We will explain the existing method that uses the strength of the radio waves received from the access point.
First, let's talk about the Triangulation method.
In this method, estimation is performed using the relative positional relationship from a reference point whose position is known.
The radio waves observed by the terminal are stronger because they are closer to the AP. Thus, if the AP information with the more vigorous received radio wave intensity is used, the positioning accuracy would be improved. Therefore, the RSSI is weighted, and the location is estimated by this equation.
Xi, Yi is the AP¡¯s coordinates, ¥ái is the value of the RSSI received at the current location, ¥á0 is the value of the RSSI at a specific distance, and n is a parameter to be set due to the physical environment's obstacles. |
IEEE/ICACT20210173 Slide.04
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