An Improved Indoor Positioning Technique Based on Receiving Signal’s Strength

Table 1

Comparison of main indoor positioning technologies.

Positioning technique	Positioning method	Positioning accuracy	Advantages	Disadvantages
Visual image	Image processing, scene analysis	High	Low environmental dependence	High cost and low stability
Infrared	Image processing, proximity detection	High	Mature technology	Visual distance transmission, interfered by light
Ultrasound	Multilateral positioning	High	High positioning accuracy	Greatly affected by temperature and loss
Bluetooth	Proximity detection, multilateral positioning	Medium	Small size and low power consumption	Short transmission distance and low stability
Wifi	Fingerprint positioning, multilateral positioning	Medium	Low cost and easy deployment	Susceptible to environmental interference
RFID	Proximity detection, fingerprint positioning	High	Low cost and small size	Short distance and weak communication ability
Ultrawideband	Multilateral positioning	High	Strong penetration	High cost
Geomagnetic	Fingerprint positioning	Medium	Not dependent on the environment	Poor stability
Cellular base station	Proximity detection	Low	Wide coverage	Depends on base station density
ZigBee	Proximity detection, multilateral positioning	High	Low cost and low power consumption	Poor stability and susceptible to interference
Pseudolite	Carrier phase ranging	High	Wide coverage	High cost
Inertial navigation	Dead reckoning	Medium	Not dependent on the external environment	Cumulative error