A Survey of Child Tracking Techniques in Wireless Sensor Network

Recent advances in telecommunication technology have led to the rapid development of sensor networks. The sensor networks have become part of everyday lives for people. There are many applications that have been developed using these networks. Each application consists of several components, which are developed in turns. Child Tracking is one application that is important to many people. There are few components that need to be developed for a complete application, localization is one of them. There are many localization techniques available for use, but the use of these applications depends on the requirements of the
application. This paper surveys the localization techniques, which have been developed in the past. Based on the survey, the localization of the target is divided into two. These two stages are signal measurement and position computation. Signal measurement is when the sensors measure the properties of the signal, which are needed to calculate the distance between the nodes. Then with known distance between the nodes, the location of the target can be calculated, in the second stage. This paper also describes some related works. These works are categorized according to the type of signal that they use and the methods used to obtain the distance between the nodes in signal measurement stage. These related works are compared in tabular form. Studying localization techniques is very important do choose the technique for the child tracking application.