A Research And Design On The Positioning System Based On DDA Technology

With the popularization of computer,the development of the internet has been unprecedentedly inflated.In today's society,communication is no longer the exclusive noun between people.In the near future,hundreds of millions of objects will be connected to the network,communicating with people or objects.Traditional means of communication,both in terms of communication capacity,real time and security,will face severe challenges.By the time the Internet of things comes,national security will be the focus of attention.At present,the national universities,research institutions and technology companies have launched research and aim to put forward some communication protocols fitting the communication characteristics between objects,and have achieved some good results.Considering the long-term development strategy,China is also developing its own mode of communication to avoid being subject to other countries in the future.DDA technology has emerged in this background.The whole article focuses on the advantages of the DDA protocol,discusses its application scope in the field of Internet of things,and realizes a set of indoor positioning scheme using DDA protocol.A single mean are often used in the traditional indoor positioning schemes.Zig Bee,Wi-Fi and visible light can be located,but cannot achieve the ideal positioning accuracy.Either the positioning accuracy is good with the high power consumption of the system,or the power consumption is low with a poor accuracy of positioning.In view of the above situations,this thesis proposes a combination of DDA and RFID to realize the indoor precise positioning and achieve the desired effect.The work done in this thesis includes the following aspects.First,the design of the hardware circuit of the DDA gateway device and the DDA location terminal device is achieved.Second,the dynamic detection method of the DDA wireless landmark is discussed.Third,the embedded program of the positioning terminal data acquisition and the data processing of gateway is designed,to realize the collection of treat label location coordinates measurement,upload,estimation and display.Finally,the data collection is experienced in the built system.The positioning accuracy does improve comparing with the results obtained by the traditional LANDMARC algorithm.DDA technology has many advantages and application scenarios compared with other LPWAN technologies.The most important point is that it is a domestic technology developed by our country,and the core knowledge is in the hands of Chinese people.It has key influence on the national security strategy of the future Internet of things.