Why is UWB more accurate than RFID, bluetooth, ZigBee, WIFI and other indoor positioning technologies?
RFID, Bluetooth, ZigBee, Wi-Fi and other positioning technologies usually use signal strength to calculate and estimate the distance between the tag and the anchor. Signal strength is affected by various factors, such as power inconsistency during signal transmission, shape deviation of transmitting antenna, and shape deviation of receiving antenna, etc. as well as any sources of interference. These can all lead to unpredictable changes in the signal, resulting a large error in the ranging results. Therefore, the positioning accuracy of such systems is generally around 3 meters (or over 5 meters for RFID).
UWB uses the "Time of flight" (TOF) of radio waves to calculate the distance between the tag and each positioning anchor, which has nothing to do with signal strength and antenna. The positioning accuracy can reach 10cm, making it is the best choice for indoor precise positioning.