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UWB positioning systems are able to provide outstanding accuracy and precision of localization. However, system performance strongly depends on the quality of reference clock oscillators installed in system devices and accuracy of anchors synchronization. The paper describes a new transmission scheme providing wireless infrastructure nodes synchronization and reduction of errors caused by tag's clock...
Wireless positioning based on IEEE 802.15.4a has recently gained attention for precise localization. However, the multi-user scalability of those, mostly two-way ranging based, approaches is not considered. Due to the exchange of multiple frames per ranging, two-way ranging has significant downsides in terms of scalability. This paper proposes and validates a novel multi-user time-difference of arrival...
One of the difficulties faced by high-sensitivity GNSS receivers is the so-called near-far problem, where the acquisition of weak signals is hampered by the presence of more powerful signals. If countermeasures are not implemented, the presence of near-far may result in loss or false acquisition of weak signals, and consequently the user's position may exhibit a huge error. In this sense, subspace...
The continuity of the positioning service, in all potential environments, and specifically from outdoors to indoors, is a fundamental aspect when one wants to increase the use of location-based services. Many techniques have so far been investigated, ranging from inertial systems to the latest light fidelity approaches. Besides these physical means, an aspect which is almost as important is the associated...
Passive acoustic localization is an important technique in a wide variety of monitoring applications, ranging from healthcare over biological survey to structural health monitoring of buildings. If the subject of interest emits a recognizable sound and is picked up by a distributed array of microphones it is possible to measure the difference in arrival times and reconstruct the source positions....
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