ABSTRACT

The Wireless sensor networks constitute the environment of a broad range of applications related to national security, surveillance, military, health care, and environmental monitoring. The coverage of Wireless Sensor Network has answered the questions about quality of service (or surveillance) which can be provided by Wireless Sensor Network. The sensor node deployment is an important and fundamental issue to be solved in Wireless Sensor Networks. By the mathematical computation and analysis, the sensor node deployments in the circular region or disk, as a rule, are better than those in the form of circle overlapping with calculation of the efficient coverage areas and its ratios decrease with increasing number of sensor nodes. But the efficient coverage area ratios decrease with increasing number of sensor nodes. Sometime information is incompletely monitored or undetected. This is coverage problem with connectivity problems. The coverage problem is also one of basic problem in wireless sensor networks. The paper analyses sensor node deployments and computes their efficient coverage areas and their efficient coverage area ratios. In addition, the relation between the number of sensors in circular region or disk and efficient coverage area ratio is discussed.