An experiment was carried out to evaluate the localization
accuracy of the iLocate system when the reference tags were
placed every 0.5mboth in the horizontal and vertical directions,
i.e., the tag density was 0.5 m. When the tag density is bigger
than 2 m, the RSSI readings become unreliable owing to signal
attenuation. When the density is lower than 0.5 m, the RSSI
readings also become error prone due to severe signal multipath
and multiple reads. Therefore, the reference tag density was set
as 0.5 m.