Localization in wireless sensor network by mobile stations based on random distribution

In many applications, knowledge of the node's position is very important. The present paper examines the latest research which has been done on methods of localization in wireless sensor networks. Then we propose a new method for localization in WSNs by mobile stations which is different from other proposed algorithms, our method includes four mobile stations and is used for localization of nodes that distributed in an area to form a square.
Sensor nodes
determine their locations as the center of the field after receiving data from four stations which are coordinated on the edge of the field.