“…Several outdoor localization methods or systems using RFID in above areas have been reported (Ruan, 2016;Yang et al, 2016;Lucianaz et al, 2015;Vojtech, Neruda, Hrad et al, 2015). Although these methods have achieved very interesting results, most of them have a drawback: They need to combine active RFID technology with GPS receiver, which has limited their applications as GPS signal may not be available in some environments (James et al, 2012), they may also suffer from high power consumption, high cost and lower accuracy. In order to overcome above drawback, the authors in (Vojtech, Neruda, Hrad et al, 2015) have presented an outdoor localization technique using active RFID.…”