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