2Radio frequency identification (rfid) home page [EB/OL].http://www.aimglobal.org/technologies/rfid
3Bluetooth Special Interest Group.Specification of the Bluetooth System [EB/OL].http://www.waterwood.com.cn/technology/bluetooth_documents/Test Mode.pdf
4Paramvir Bahland Venkata N.Padmanabhan.RADAR:Aninbuilding RF-based user location and tracking system [M] .In INFOCOM (2),pages 775-784.2000.
5Yiu Cho Lau.Landmaric:Location identification based on dynamic active rfid calibration [M].In ICDE.2002.
6Abhishek Pramod Patil.Performance of bluetooth technologies and their applications to location sensing [M].In ICDE.2002.
7Simonas Saltenis and Christian S.Jensen.Indexing of moving objects for location-based services [M] .In ICDE.2002.