Results 101 to 110 of about 57,094 (309)
Blind Adaptive Beamformer Based on Orthogonal Projections for GNSS
, 2012 The quality of the ranging data provided by a global navigation satellite systems (GNSS) receiver largely depends on the synchronization error, that is, on the accuracy of the propagation time-delay estimation of the line-of-sight (LOS) signal.
Noll, Tobias G. +4 more
core
, 2013 The article provides an overview of the BeiDou navigation message contents and highlights its specific communalities and differences with respect to other GNSS constellations. Making use of data collected by multi-GNSS monitoring stations of the MGEX and
Steigenberger, Peter +1 more
core +1 more source
GNSS SpAmming: a spoofing-based GNSS denial-of-service attack
CoRRGNSSs are vulnerable to attacks of two kinds: jamming (i.e. denying access to the signal) and spoofing (i.e. impersonating a legitimate satellite). These attacks have been extensively studied, and we have a myriad of countermeasures to mitigate them. In this paper we expose a new type of attack: SpAmming, which combines both approaches to achieve the ...
Sergio Angulo Cosín +3 more
openaire +2 more sources
Dynamic Cell Division for Interference Management in Satellite Direct‐to‐Cell Systems
International Journal of Satellite Communications and Networking, EarlyView.ABSTRACT Direct‐to‐cell (D2C) connectivity enables future non‐terrestrial networks to provide service directly to standard terrestrial user equipment (UE) when terrestrial networks (TN) are unavailable. In this work, the satellite system is considered as a secondary network that supplements existing TN coverage while minimizing interference to the ...
Satya Chan +3 more
wiley +1 more source
Improved Short-Term Clock Prediction Method for Real-Time Positioning
Sensors, 2017 The application of real-time precise point positioning (PPP) requires real-time precise orbit and clock products that should be predicted within a short time to compensate for the communication delay or data gap. Unlike orbit correction, clock correction
Yifei Lv +5 more
doaj +1 more source
On Backward Compatibility in GNSS Signal Design
, 2011 This work further develops tools and methodologies for systematic GNSS signal design. Inter and intra system multiple access interference (MAI), synchronization accuracy, time-delay estimation robustness, and backward compatibility with respect to ...
Antreich, Felix +3 more
core
Solutions to the technical limitations of GNSS for indoor localisation
, 2023 openLa localizzazione in ambienti indoor è oramai divenuta fondamentale in diversi ambiti come la sanità, l'istruzione, il commercio, l'intrattenimento, il trasporto e la logistica. L'utilizzo di tecnologie basate sul Global Navigation Satellite System
ZIGBUO, DANIEL YEBOAH
core
Multibeam antenna array and software switching for low-complexity low-cost GNSS beamforming
, 2022 S.59-65The received signals from GNSS satellites are low power and below the noise floor. Furthermore, GNSS antennas have low directivity to receive all signals simultaneously. Beamforming improves the carrier-to-noise density ratio (C/N0) before further
Rügamer, A. +5 more
core +1 more source
Sampling, Mobility, and Anchoring in Small‐Body Sampling Robots: A Comprehensive Review
SmartBot, EarlyView.Small‐body sampling robots are exploration systems that perform contact, sampling, and stable operations on microgravity bodies such as asteroids and comets. The authors review representative robot architectures and key technologies, focusing on the mechanisms, evolution, and coupling of sampling, mobility, and anchoring.
Yurui Shen +7 more
wiley +1 more source
2D LiDAR SLAM Back-End Optimization with Control Network Constraint for Mobile Mapping
Sensors, 2018 Simultaneous localization and mapping (SLAM) has been investigated in the field of robotics for two decades, as it is considered to be an effective method for solving the positioning and mapping problem in a single framework.
Jingren Wen +5 more
doaj +1 more source