Research on efficient coverage problem of node in wireless sensor networks

Efficient coverage area and efficient coverage area ratio of node are put forward by analysis of coverage problem of wireless sensor networks (WSN). It is theoretically proved through math modeling, theoretical analysis and formula deducting that how much the maximum efficient coverage area, the maximum efficient coverage area ratio, the maximum of net efficient coverage area and the maximum of net efficient coverage area ratio of node is if full seamless coverage is met in wireless sensor networks. At last, the analysis formula is given that minimum number of radio nodes is demanded in a given sensor field if the field is covered fully and seamlessly. The formula resolves a math problem of wireless sensor networks in theory. The research on the size of nodes has significant meanings of theory research and networks designing of wireless sensor networks.