SENSOR AREA NETWORK FOR ACTIVE RTLS IN RFID TRACKING APPLICATIONS AT 2.4GHZ
| Autor: | Inigo Cuinas, Ana Vazquez Alejos, Manuel Garcia Sanchez, Jose Carlos GarcÃa Valladares |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Radiation
Cover (telecommunications) Computer science business.industry Wireless network Real-time computing Tracking system Kalman filter Condensed Matter Physics Signal Real-time locating system Electrical and Electronic Engineering Telecommunications business Wireless sensor network Multipath propagation |
| Zdroj: | Progress In Electromagnetics Research. 110:43-58 |
| ISSN: | 1559-8985 |
| DOI: | 10.2528/pier10100204 |
| Popis: | Power strength or Received Signal Strength Indicator (RSSI), a primary technique used in Real Time Location Systems (RTLS), is analyzed in this paper for RFID tracking applications. Critical issues are studied and hardware novelties are introduced in order to improve its performance. The main novelty is the accomplishment of an RFID RTLS through a mesh of individual active radiofrequency (RF) barriers composed by active emitter and receiver nodes/tags that cover only small individual areas. The result is a Sensor Area Network (SAN) that ofiers some advantages over classical tracking systems, which are based on Wireless Sensor Networks (WSN), especially in the multipath impairment mitigation, such as a controlled power emission, and the chance to warrant privacy regarding the exchange of RFID information. Experimental measurements were done to estimate the in∞uence of the transmitted signal type and the receiver end architecture in the detection of the RF barrier presence. The parameterization of the coverage area of a SAN cell in terms of power is derived for both free-space and log-distance propagation models. The Kalman flltering technique is introduced as a valid tool to severely mitigate the multipath propagation efiects that can afiect the accurate operation of the proposed SAN for indoor operation conditions. Outcomes show a promising performance for this wireless network design, which has not received enough attention in literature. |
| Databáze: | OpenAIRE |
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