Enhanced Coverage Passive RFID Tracking System
Typically there is a trade-off to be made between the cost of an RFID tracking system and the coverage and tag locating capabilities which can be achieved. Most systems capable of reading tags with near 100% success rate over distances up to 100m require active tags to achieve their long range and high resolution location accuracy. Alternatively passive systems with cheaper tags, are limited to a reliable tag detection range of only a few meters.
Now researchers from the University of Cambridge have developed a system using passive tags and advanced signal processing which can achieve comparable tag detection performance to active tags at a lower cost point. This enables near 100% read success and has been demonstrated for asset tracking over a 20x20m2 area, although the system can readily scale to larger areas. The researchers have also demonstrated the potential of the technique for accurate real time location capabilities.
This technology is protected by patent applications in US, Europe and China, and is now ready for pilot commercial applications such as inventory and asset tracking and monitoring patient movement in hospitals.