In this paper we describe three methods for localizing a wireless sensor network node, using anchor nodes in its neighbourhood, when there is an error in distance estimation present. We use the intersection points of the circles formed with the estimated distances from each anchors and we apply different methods to form clusters. We then use the cluster points to calculate the final position.

Dealing with uncertainty is a necessary and difficult aspect in operations analysis of complex systems such as the air transportation system. We represent these uncertainties in the approach process by probability distributions. This paper provides statistical observations of the approach and landing process at Detroit Metropolitan airport (DTW) for one week of February 2003. These probability ...

The node localization problem in mobile sensor networks has recently received significant attention. Particle filters, adapted from robotics, have produced good localization accuracies in conventional settings, but suffer significantly when used in challenging indoor and mobile environments characterized by a high degree of radio irregularity. We propose FuzLoc, a fuzzy logic-based approach for...

In this paper, we complete the study of the geometry of the TDOA map that encodes the noiseless model for the localization of a source from the range differences between three receivers in a plane, by computing the Cartesian equation of the bifurcation curve in terms of the positions of the receivers. From that equation, we can compute its real asymptotic lines. The present manuscript completes...

The presence of (Non line of Sight) NLOS propagation paths has been considered the main drawback for localization schemes to estimate the position of a (Mobile User) MU in an indoor environment. This paper presents a comprehensive wireless localization system based on (Round-Trip Time) RTT measurements in an unmodified IEEE 802.11 wireless network. It overcomes the NLOS impairment by implementi...

We have measured the three-dimensional coordinates of retroreflecting glass spheres using a multilateration technique. To this end, distances between each target and our measurement heads been determined by an in-house prototype electro-optical absolute distance meter. The used targets are refractive index n = 2 diameter 14.2 mm. They offer much larger aperture than corner cubes lower cost, but...

Abstract Currently accuracy of manufacturing machines is a must. Verification the main way to obtain it; highlighting volumetric verification as best technique improve machine tool position along all its workspace in shortest time possible. In this way, different measurements based on multilateration techniques like laser tracker and tracer are used. This paper studies how characteristics new h...