Focusing on the problem of target locating in wireless sensor networks

a target locating algorithm based on energy is proposed.The virtual anchor nodes are formed by collecting the track of moving anchor nodes

while the locations of unknown nodes are determined by using triangular positioning so that the density of anchor nodes is increased.An approximate point-in-triangulation test（APIT） technology was adopted in the positioning of object and node localization of wireless sensor networks.After adding a weighted factor

the influence of anchor nodes to unknown location is used to determine the weighting factor and improve the positioning accuracy.Test results indicate that the APIT technology can bring higher target locating precision

thus the accuracy of target locating in wireless sensor networks can be improved effectively.