Sammendrag
A complete, structural and comprehensive description of indoor localization technology is pre-sented in this paper. It concluded the basic techniques for distance measurement in indoor locali-zation, the basic localize principles, the topologies and algorithms which are often used in indoor localization area. Then how to perform indoor localization with sensors which are available in modern smartphones are detailly discussed. A topic about how to design an indoor localization based on the previous concluded knowledge is introduced and an example was given. In the end, the value of indoor localization for industry is briefly talked