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Comparison of Existing Technologies Based on Different Technologies.
| Technology | Technique | Indoor | Outdoor | Requirement of Infrastructure |
|---|---|---|---|---|
| Direct Sensing | RFID | ✓ | ✓ | ✓ |
| Bluetooth | ✓ | ✓ | ✓ | |
| I.R.R. | ✓ | - | ✓ | |
| Barcodes | ✓ | ✓ | ✓ | |
| Dead Reckoning | IMU | ✓ | ✓ | - |
| Triangulation | From direct sensing | ✓ | ✓ | ✓ |
| GNSS | - | ✓ | - | |
| Fingerprint | ✓ | ✓ | - | |
| Pattern Recognition | Markers | ✓ | ✓ | - |
| Natural Elements | ✓ | ✓ | - | |
| 3D Sensing | ✓ | ✓ | - |
