Uwb Localization of Nodes for Securing a Manet

Localization of nodes in an infrastructure less network serves many purposes. Several issues relating to security, routing, etc it can be solved if only the actual location of nodes were known. Existing approaches estimate the location of a node in a network by using received signal strength indicator (RSSI), Time of Arrival, Time difference of Arrival and, if directional antennas are available, Direction of Arrival. In these methods the localization accuracy is less (in the order of 20cm). The aim of this paper is to localize nodes in adhoc networks with improved accuracy using ultra wide band.The proposed method uses a train of low amplitude pulses of high bandwidth, which reduces the energy consumption, effects due to small scale fading, and dispersion in time and frequency. The network was simulated in NS-2 with UWB extension and the localization accuracy was found to be improved (upto 1cm).