摘要：The important goal of location based services is to fix accurately the position of the user or an object. Location based services are becoming attractive with the deployment of next generation wireless networks and broad band multimedia wireless technologies. In this study, an effort is made to compare the performance of different range based indoor localization for UWB radio. Location estimation systems are based on Received Signal Strength Indicator (RSSI), Time of Arrival (TOA) and Time Difference of Arrival (TDOA) methods. The Kalman filter is employed to estimate real time positioning of the user. Ultra Wide Band (UWB) radio is to provide high time resolution and very good accuracy in the case of time based techniques. Finally this paper compares the performance of these three different range based methods by simulation using MATLAB. Results show that the accuracy is better in TDOA using Generalized Cross Correlation method (GCC). The proposed system is composed of UWB nodes (Receiver or reference node whose position is known), UWB tags (Transmitter or source or unknown position of the target) and an UWB location server to calculate the position of the tags accurately.
