Table 1.

Relevant works related to several techniques applied for Indoor Positioning Systems (IPSs). WRB, Wireless-Radio-Based.

IPS	Technologies	Algorithms	Accuracy
[12]	WLAN and GPS	WRB	13–40 m
[7,20]	Earth’s magnetic field and WiFi	N.A.	4 m
[21]	WiFi and IMU	MLA	1.96 m
[6,9,10,11,13,14,15,16,17,18,22,23,24,25,26,27,28,29,30]	WLAN and RSSI	Bayesian Filter, ANNs, Gaussian kernels, KNN, among others	1.60 m