Location Estimation of Mobile Devices in CSS WPANs

The location estimation of mobile devices in low rate WPAN is specified as optional function and the devices complied with CSS specification have been used widely in many application of the sensor networks. The performance of location estimation using CSS devices are reported in many researches. We have studied post processing algorithms using extended Kalman filter to improve the accuracy of the locations of mobile devices. We consider a new parameter for frequency offset of device. In case of TOA and TDOA, we experienced and simulated our algorithm, and find that the algorithm show better performance. In this paper, we describe our algorithms and those performances.