Table 3.

RSS-IMU hybrid positioning systems.

System	Technologies	RSS	IMU		Anchors	Area (${\mathbf{m}}^2$)	Error (m)	Cost	Scalability
			Position	Method
Frank et al. [47]	WiFi, MEMS	Fingerprinting	Foot	SHS	11	Floor	1.65	Medium	Limited by calibration
Schmid et al. [48]	WSN, MEMS	Propagation model	Hip	SHS	62	1125	4	Low	Yes
Tarrío et al. [49]	WSN, MEMS	Propagation model	Waist	SHS	9	100	2.3	Low	Yes
Correa et al. [64]	WSN, MEMS	Propagation model	Waist	SHS	8	155	0.9	Low	Yes
Jiménez et al. [50]	RFID, MEMS	Propagation model	Foot	Strapdown	71	2200	1.35	Low	Yes