9Hightower J, Want R, Borr Iello G SpotON An Indoor 3D Location Sensing Technology Based on RF Signal Strength [R]. WA: University of Washington, Department of Computer Science and Engineering, Seattle,2000.
10Lionel Mn, Yunhao L, Yiu CI, et al. LANDMARC: Indoor Location Sensing Using Active RF ID [A].Proceedings of the First IEEE International Conference[C] .2003.407 -415.
