Enhanced Position Estimation Via Node Cooperation
| Citation: |
Sahinoglu, Z.; Gezici, S., "Enhanced Position Estimation via Node Cooperation", IEEE International Conference on Communications (ICC), DOI: 10.1109/ICC.2010.5502319, pp. 1-6, May 2010 (IEEE Xplore) |
| MERL Report: | TR2010-066 |
Two-way time-of-arrival (TW-ToA) is a widely used ranging protocol that can provide the distance between tow devices without time synchronization. One drawback of the TW-ToA is poor positioning accuracy in the absence of a sufficient number of reference ranging devices. Also, for a self-positioning system with a limited battery life, it might be necessary to limit the number of transmissions while satisfying accuracy constraints. In this paper, a cooperative positioning protocol [1] is studied, which can improve positioning accuracy compared to the conventional TW-ToA based positioning systems and also facilitate positioning with fewer packet transmissions; hence, it can prolong battery life on average. The maximum likelihood estimator is obtained for the cooperative technique and the limits on the positioning accuracy are quantified in terms of the Cramer-Rao lower bound (CRLB). Simulation results are provided in order to show performance improvements.
