Types of Technologies Used
There is a wide variety of systems concepts and designs to provide real-time locating.
- Active radio frequency identification (Active RFID)
- Active radio frequency identification - infrared hybrid (Active RFID-IR)
- Infrared (IR)
- Optical locating,
- Low-frequency signpost identification
- Semi-active radio frequency identification (semi-active RFID)
- Radio beacon,
- Ultrasound Identification (US-ID)
- Ultrasonic ranging (US-RTLS)
- Ultra-wideband (UWB)
- Wide-over-narrow band
- Wireless Local Area Network (WLAN, Wi-Fi)
- Bluetooth,
- Clustering in noisy ambience,
- Bivalent systems
A general model for selection of the best solution for a locating problem has been constructed at the Radboud University of Nijmegen. Many of these references do not comply with the definitions given in international standardization with ISO/IEC 19762-5 and ISO/IEC 24730-1. However, some aspects of real-time performance are served and aspects of locating are addressed in context of absolute coordinates.
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