Research Article
An Indoor Ultrasonic Positioning System Based on TOA for Internet of Things
Table 4
Comparison between this method and other technologies.
| | Method | Image | RFID | Bluetooth | WiFi | UWB | Infrared | ZigBee | Ultrasonic |
| | Accuracy (meter) | 10−6~10−1 | 10−2~1 | 2~3 | 3~40 | 10−1~1 | 10−2~1 | 1~10 | 2 cm |
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