Results 31 to 40 of about 3,863,163 (394)
On the Connection of Radio and γ-Ray Emission in Blazars
Galaxies, 2018 Blazars are a sub-category of radio-loud active galactic nuclei with relativistic jets pointing towards to the observer. They are well-known for their non-thermal variable emission, which practically extends over the whole electromagnetic spectrum ...
Stella Boula +2 more
doaj +1 more source
Localization of the Chang'e-5 Lander Using Radio-Tracking and Image-Based Methods
Remote Sensing, 2021 Chang’e-5, China’s first unmanned lunar sample-return mission, was successfully landed in Northern Oceanus Procellarum on 1 December 2020. Determining the lander location precisely and timely is critical for both engineering operations and subsequent ...
Jia Wang +12 more
semanticscholar +1 more source
Recent Advances in Indoor Localization via Visible Lights: A Survey
Sensors, 2020 Because of the limitations of the Global Positioning System (GPS) in indoor scenarios, various types of indoor positioning or localization technologies have been proposed and deployed.
A B M Mohaimenur Rahman +2 more
doaj +1 more source
Velocity-Based Channel Charting With Spatial Distribution Map Matching
IEEE Journal of Indoor and Seamless Positioning and NavigationRadio fingerprinting (FP) technologies improve localization performance in challenging non-line-of-sight environments. However, FP is expensive as its life cycle management requires recording reference signals for initial training and when the ...
Maximilian Stahlke +4 more
doaj +1 more source
Radio Map Framework for GSM Positioning
Communications, 2009 This paper introduces radio map framework for creation of GSM (Global System for Mobile communications) network radio maps. These radio maps are structured in the way that they can be utilized later on as a data source for fingerprinting-based ...
Peter Brida, Jozef Benikovsky
doaj +1 more source
Multiple Radio Transmitter Localization via UAV-Based Mapping
IEEE Transactions on Vehicular Technology, 2021 The widespread use of unmanned aerial vehicles (UAVs) has opened a novel perspective on spectrum awareness and localization because of their ability to overcome spatial limits and the burden of dedicated infrastructure.
Zhu-Yin Li +2 more
semanticscholar +1 more source
Uncertainty-Based Fingerprinting Model Monitoring for Radio Localization
IEEE Journal of Indoor and Seamless Positioning and NavigationIndoor radio environments often consist of areas with mixed propagation conditions. In line-of-sight (LoS)-dominated areas, classic time-of-flight (ToF) methods reliably return accurate positions, while in nonline-of-sight (NLoS) dominated areas (AI ...
Maximilian Stahlke +4 more
doaj +1 more source
Local Radio News (Un bulletin de radio locale)
Les Cahiers de l'APLIUT, 2005 Type d’activite : tâche communicative Langue : anglais (l’exemple en annexe, mais s’adapte a toutes les langues) Niveau : moyen - avance (ALTE B1/B2+) Faits de langue : past simple, present perfect, discours indirect Materiel : polycopies, crayons, papier Temps de preparation enseignant : 2 heures Duree de l’activite : 2 heures Nombre d’etudiants : 12 ...
openaire +1 more source
MuCHLoc: Indoor ZigBee Localization System Utilizing Inter-Channel Characteristics
Sensors, 2019 The deployment of a large-scale indoor sensor network faces a sensor localization problem because we need to manually locate significantly large numbers of sensors when Global Positioning System (GPS) is unavailable in an indoor environment ...
Ryota Kimoto +4 more
doaj +1 more source
Channel Diversity for Indoor Localization Using Bluetooth Low Energy and Extended Advertisements
IEEE Access, 2021 Bluetooth Low Energy (BLE) is a ubiquitous low-power communication technology used in many applications including location-based services. Typically, in BLE localization, the beacons transmit advertisement messages while moving devices infer their ...
Maciej Nikodem, Przemyslaw Szelinski
doaj +1 more source