Embedded Operating System For Wireless Sensor Networks And Applications

Wireless sensor network(WSN) which integrates sensor technology,embedded computing technology , distributed information processing technology, wireless communication technology , modern microelectronics technology is a novel technology about acquiring and processing information. It has been predicted to have a wide range of applications related to national security, military, environmental monitoring, health care, intelligent household and other aspects of human activity.It has been aroused widely concern by governments, research institutions and companies and become the most one of hot research direction. The capability including energy, small physical size and limited memory space for the WSN nodes devices is Extremely limited The design of the embedded operating system that has to realize efficient management of the hardware and meet the concurrency-intensive operation in WSN constitutes one of the most challenging research fields and difficulties。On the basis of analyzing characteristics and technology of WSN,This thesis summarize the design requirement of embedded operating system to meet the application of WSN and trace the research progress in this field both at domestic and foreign ,especially on the typical embedded operating system UC Berkeley's TinyOS study, including the models of component, event-driven mechanics, schedule strategy and the programming language; It has been impleted for the transplanting from TinyOS to project platform based on the profound research of the Hardware Abstraction Architecture of TinyOS, Furthermore, The driver component of senor SHT1x and a practical application of WSN for temperature and humidity data collect is developed base on this Platform. Lastly, Applications can not all at once deploy on wireless sensor network nodes because of WSN characteristics such as Large scale, variety of Application, Extremely limited resources, The research of remote wireless upgrade ability for operating system is very necessary. The GAF algorithm is introduced and redesigned the remote wireless update system for TinyOS operating system based on the analysis of the source code,shortage and theory of the Deluge for the the existing system of remote wireless code update for TinyOS,In redesigned update system, the network is divided into several grids which constituted by cluster head and member nodes,cluster head represent the whole grid to communicate with other grids use Deluge and member nodes turn into sleeping state, therefore The working node for the code distribution of the Deluge agreement number is reduced. Theoretical analysis and simulation experiments show that the new upgrade system can reduce the energy consumption and prolong the lifetime of wireless sensor network.