233 documents found, page 1 of 24

Da Relação entre a Nação e o Estado

Tratado de Tordesilhas de 7 de Junho de 1494

Estudos Superiores de Estratégia

Enhancing direction-of-arrival estimation via sliding window and filtering of p...

ndoor Positioning has grown considerably in recent years due to technological advancements and its usefulness for product tracking, pedestrian navigation, or autonomous driving. Indoor Positioning systems comprise three main components: the supporting technology, the underlying measurements, and the position estimation algorithm/method. One measurement that has been attracting attention recently is Direction of...

A multiple BLE beacon approach for tracking in industrial environments

Developing an Indoor Positioning System (IPS) for an industrial environment is a challenging task in its attempt to balance accuracy, cost, maintainability, and scalability. In many cases, sub-meter accuracy is not essential, allowing the use of less accurate yet more cost-effective technologies, such as Received Signal Strength Indicator (RSSI)-based positioning using Bluetooth Low Energy (BLE). While the comm...

A Crise do Estado Soberano

A Nova Europa

Asynchronous time-based indoor localization systems - comparative analysis unde...

The growing need for accurate localization in increasingly interconnected industrial environments has driven research towards developing new indoor localization systems. This work analyzes and compares three asynchronous localization methods based on the Two-Way-Ranging (TWR) protocol: Single-Sided TWR (SS-TWR), Symmetric Double-Sided TWR (SDS-TWR), and Alternative Double-Sided TWR (AltDS-TWR) in addition to th...

Time matters: empirical insights into the limits and challenges of temporal gen...

Wi-Fi is ubiquitous, and Channel State Information (CSI)-based sensing has often emerged as superior for tasks like human activity recognition (HAR) and indoor positioning (IP) The foundational premise is that similar scenarios exhibit similar CSI patterns. However, establishing such similarities is challenging due to signal attenuation and multipath effects caused by static and dynamic objects, that create com...

Comparing synchronous and asynchronous UWB time-based localization systems for ...

Autonomous Mobile Robots (AMRs) are essential for automating internal transportation in Industry 4.0, relying on visual-based positioning systems to generate maps and compare their location with mapped reference obstacles. However, enhancing positioning accuracy is crucial for demanding industrial tasks. Combining vision-based systems with Ultra-Wideband (UWB) time-based positioning systems has gained research ...