The Design And Implementation Of Indoor Positioning System Based On Contiki

With the rapid development of Internet of things industry,wireless sensor network become the frontier hot research field of current international concern, involving a high degree of interdisciplinary, highly integrated knowledge. Wireless sensor networks are widely used in many fields,likes agriculture, industry, transportation, logistics, many specific applications are based on the specific location, so location information is very important. Design a high-precision, low-complexity positioning system technology has been a hot issue in the field of IOT.The paper according to the actual needs of urban radioactive waste repository,completed the design and implementation of indoor environment oriented wireless sensor network indoor positioning system. Through the hardware design and implementation of wireless sensor network positioning node, depth analysis of the working principle of Contiki operating system and Rime wireless communication protocol stack, transplantation of Contiki operating system and writing application test code,completed the design of indoor positioning system used in urban radioactive waste repository is completed.The main contents of this paper are following:First,designed the overall scheme of the positioning system and the node of the location system. According to the requirement analysis of the urban radioactive waste repository and the characteristics of the wireless sensor network positioning system, designed three functional nodes of the positioning system and complete the corresponding function method. Node used the with enhanced8051 core and RF chip of CC2530 chip which produced by TI company, designed its peripheral circuits and completed the hardware design of the positioning system node;Second,based on the range-based algorithm of RSSI-based positioning algorithm and detailed analysis of the transmission characteristics of the wireless signal in the room,design system location algorithm;Third,based on the hardware design of the system node, through the analysis of the operation principle and operation mechanism of the Contiki system,completed the transplantation of Contiki operating system.Analysised the operation principle of the Rime protocol stack, designed tree network for indoor positioning system, according to the different function of the node, complete the corresponding functional program design.Finally,tested the performance of the system by testing the hardware of the system and the wireless sensor network and analyzed the test results. Taking the laboratory as a test scenario, simulated urban radioactive waste repository environment, verify and test the effectiveness of the positioning system. Testing results showed that the positioning system can complete the prior design requirements.Finally, this paper completed the design and implementation of indoor positioning system based on Contiki through the completion of the above series of work.