| the information sent by some position known reference node. At present in the outdoor environment, there are a lot of successful commercial positioning systems, such as GPS (global positioning system). With the promotion of the positioning application, the positioning market is much bigger than before while also the users require higher positioning precision. Therefore, developing low cost high precision positioning system used in the complex indoor environment become one of the hot and difficult in research of positioning system.This paper developed an indoor positioning system based on the ZigBee technology. The positioning applications developed on this system can be used in many fields. Because the GPS signal hardly spread through wall, GPS can not be used in the indoor environment. This system can be used as an extention of GPS in the indoor environment. Similar indoor positioning systems are much more expensive or their location accuracy is unacceptable. Our design goal is to develop a real-time indoor positioning system with lowest cost and acceptable positioning accuracy. This paper mainly completed the following work:based on CC2430chip development kit, implement the TI provided ZigBee protocol Stack Z-Stack and complete network organization. Change the hardware abstraction layer and the application layer code of ZigBee protocol stack, and implement Z-Stack on the hardware designed by ourself. Complete the design of ZigBee network; write code for the ZigBee coordinator, reference nodes and blind node. Build the data processing SOPC using Nios Ⅱ processor, Avalon interface and arbitration on the slave side. Complete the design of ZigBee network; write code for the ZigBee coordinator, reference nodes and blind node. Build the data processing SOPC using Nios Ⅱ processor, Avalon interface and arbitration on the slave side. Port uClinux to Nios Ⅱ system, write the graphical user interface using Nano-X API, do the multithread programming, verify the system. |
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