Range-only tracking in multipath environments: an algorithm based on particle filtering
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Robust mobile terminal tracking in NLOS environments based on data association
IEEE Transactions on Signal Processing
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The location performance within a wireless communication system is severely impaired by biases introduced in the range measures because of the Non-Line-Of-Sight (NLOS) condition, caused by obstacles in the transmitted signal path. Usually not all the base stations (BS) are in NLOS, and the knowledge of the LOS-NLOS situation for each measure can improve the final positioning accuracy [6]. This paper studies the use of a Particle Filter (PF) to track the LOS-NLOS situation for each BS. A Rao-Blackwellized approach is used to estimate both the position, by an appropriate Unscented Kalman Filter (UKF), and the situation, by a PF. The approach shows a remarkable reduction in positioning error and a high degree of scalability in terms of performance versus complexity.