Localization of Wireless Sensor Network Using Triangulation in Industrial Environment

ABSTRACT: Wireless sensor networks (WSNs) have important role in new generation of manufacturing systems due to the fact that is an infrastructure comprised of computing, measuring and communication elements that gives the ability to users to observe, instrument and react to events and phenomena in a specified environment. In wireless sensor networks one of the significant problems is the localization of sensor nodes based on the location of several nodes. The main object of the current study is to simulate triangulation method based on received signal strength indicator (RSSI) as distance estimation measurement in industrial environment. In the theoretical part with using Cartesian coordinates four networked transceivers arranged in a triangular pattern and each one equipped with one anchor node. Then with utility of RSSI equation have calculated the position of unknown node of more than hundred points. The first experimental environment has done at the exterior space and without any equipment and in very quiet place. The coordinate system in this experiment was performed on ground and also RSSI was calculated for every meter on x and yaxis separately. Then for making comparison, the theoretical results for RSSI were achieved from Friss equation. The second experimental part was done in the industrial environment with lots of mechanical machines and manufacturing tools and same as first experiment in two dimension but reverse of first experiment in this part there was too many noises. After comparison RSSI errors between second experimental environment and Friss equation, results show that simulation of triangulation method based on RSSI in industrial environment is executable. At the final part of thesis the comparison was done between three localization methods that were researched in EMU. Keywords: Wireless Sensor Networks, Localization, Triangulation, Received Signal Strength Indicator. ……………………………………………………………………………………………………………………………………………………………………………………………………………………