An Overview of Indoor Localization Techniques for Child Tracking in Wireless Sensor Network

Recent advances in telecommunication technology has led to the 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. There are many localization techniques available for use, but the use of these applications depends on the requirements of the application. This paper is an overview paper, which describes the steps of localization, and the components required for these steps. Basically, the localization is divided into two steps: signal measurement
and position computation. Signal measurement step requires
the sensors to measure some signal properties. And then the
measurements of the signal are used in the computation of
the location in the 2nd step, position computation. Two of the most widely used methods, triangulation and trilateration, are described in the paper, as well as, few newer methods. There are many localization systems, which have already been developed. Some of these localization systems are described in the end of the paper and compared in the table. Overall, this paper shows that all the localization systems have similar basics, but use different techniques provided for each type of application.