The Research On The Coverage Model Of Wireless Sensor Network

As a brand-new development direction of information science domain, Wireless sensor networks(WSN) has caused widespread attention of the academic circles and the industry due to the great promise and the potential with the various applications. WSN consists of a large number of sensor nodes which integrate sensor, the unit for data processing and the module for the short distance wireless communication. The networks is a kind of wireless ad hoc networks with a distinct data-centric property, and the objective of sensor networks is to sense, collect and process the information of the various environments or the detected objects in the coverage area of the networks,and then send the sensing information to the user. At present, WSN has been utilied for the health care, military defense, anti-terrorist,disaster prevention and other commercial area.Along with the the development of wireless sensor network,the network coverage already became the hot spot of the WSN research. it's of great importance to improve the network performance through enhancing the coverage rate with which the connection is guaranteed in the target area. There are some coverage algorithms in recent coverage rate research works, however these works are based on the unrealistic assumption of perfect coverage. These algorithms are not applied in the real deployment of the WSN ,because the sensing capabilities of networked sensors are affected by environment factors.Firstly, this paper introduces the basic principle and the research status worldwide of WSN briefly, captures the coverage control problem of WSN, proposes some recent theorise and algorithms, discusses several typical algorithms which are based on the unrealistic environment can not be applied in the real progect; secondly, According to the theoretical approach in wireless channel fading model and the analysis of the experimental data indoors and outdoors coming from the channel fading testing system of the wireless sensor networks, this paper proposes the WSN indoor channel model in the uncertain situation, the various parameters of the channel fading model were obtained and the indoor channel fading model of wireless sensor networks was confirmed. A practical experiment shows that this model is better than the rest in the node location and deployment; finally, this paper establishes the WSN simulation system with the proposed channel model under NS2 platform in the Linux system. The position of the nodes of wireless sensor networks is dynamically adjusted with the simulation system of wireless sensor networks in the indoors environment, the coverage rate of the WSN is increased in the situation which the communication is supported, so that we could obtain the optimum deployment plan which could have the guiding value to the real environment.