Based On ZigBee Wireless Sensor Network Protocol Improved Indoor Positioning System

With the rapid development of the information technology (IT), the positioningtechnology is regarded greatly by researchers at home and abroad. At present, theresearches mainly focus on the wireless indoor positioning, especially hotspotproblems such as positioning time, positioning accuracy, positioning of complexenvironment, network safety of wireless positioning system and so on. Based onresearch and development of XXX Secret Product Management and Control Systemwhich is classified as a ministry-level key scientific and technological project anddeepening the researches on the positioning technology for wireless sensor network,this paper emphasizes the researches on key problems in the wireless sensor network,such as elimination of measurement error, positioning measurement accuracy,wireless network safety and so forth. On the basis of positioning algorithm of TOF(Time of Flight), a suit of improved indoor design scheme is hereby designed, it isproved through experiments that the scheme can raise the positioning accuracyeffectively, the high system safety can defend against any routine invasion andprotection behavior and show positive significance on the researches on the wirelesspositioning technology.The researches in this paper mainly involve the contents as follows:1. It represents the research and development status of the wireless sensing network,such as movable positioning technology, indoor positioning technology and so on.2. It represents comparative analyses on the main existing wireless positioningalgorithm and discussions on its application foreground.3. It represents deep researches on the two key technologies for the wireless sensornetwork: positioning algorithm and clock synchronization technique. The positioningalgorithm in this paper is based on TOF positioning algorithm, and the algorithm ofHRTS (Hierarchy Referencing Time Snychronization Protocol) is selected to ensurethat clock synchronization of the positioning system.4. The researches adopt improved Kalman filter algorithm to process the estimatedpositioning result so as to reduce the influences of the non-line-of-sight (NLOS) onthe positioning measuring algorithm and improve the positioning accuracy.5. Based on node certification, correspondence encryption, safe route, informationexchange and so on, the existing mature technologies, such as AES encryptionalgorithm, HASH function and so on, are adopted for research and design of thesafety module of the system in order to ensure the data safety of the system.