Results 71 to 80 of about 18,773 (179)

An Innovative Low-Power, Low-Cost, Multi-Constellation Geodetic-Grade Global Navigation Satellite System Reference Station for the Densification of Permanent Networks: The GREAT Project. [PDF]

Sensors (Basel), 2023
Curone D, Savarese G, Antonini M, Baucry R, Amani E, Boulandet A, Cataldo M, Chambon P, Chersich M, Hussein AB, Menuel B, Tsaturyan A.   +11 more
europepmc   +1 more source

Detection of GNSS signals propagation in urban canyos using 3D city models [PDF]

, 2015
This paper presents one of the solutions to the problem of multipath propagation and effects on Global Navigation Satellite Systems (GNSS) signals in urban canyons.
Chod, Jiří, Píšová, Petra
core   +2 more sources

Navigation Performance of Global Navigation Satellite Systems in the Space Service Volume [PDF]

This paper extends the results I reported at this year's ION International Technical Meeting on multi-constellation GNSS coverage by showing how the use of multi-constellation GNSS improves Geometric Dilution of Precision (GDOP).
Force, Dale A.
core   +1 more source

Urban Positioning on a Smartphone: Real-time Shadow Matching Using GNSS and 3D City Models [PDF]

, 2013
The performance of global navigation satellite system (GNSS) user equipment in urban canyons is particularly poor in the cross-street direction. This is because more signals are blocked by buildings in the cross-street direction than along the street [1].
Groves, PD, Wang, L, Ziebart, MK
core  

Combating Single-Frequency Jamming through a Multi-Frequency, Multi-Constellation Software Receiver: A Case Study for Maritime Navigation in the Gulf of Finland. [PDF]

Sensors (Basel), 2022
Islam S, Bhuiyan MZH, Thombre S, Kaasalainen S.   +3 more
europepmc   +1 more source

GNSS Shadow Matching: Improving Urban Positioning Accuracy Using a 3D City Model with Optimized Visibility Prediction Scoring [PDF]

, 2012
The poor performance of global navigation satellite systems (GNSS) user equipment in urban canyons is a well-known problem, especially in the cross-street direction.
Groves, PD, Wang, L, Ziebart, MK
core  

GNSS Signals Acquisition and Tracking in Unfavorable Environment [PDF]

Radioengineering, 2018
In this paper, we propose a method based on applying specific transformations to the Global Navigation Satellite System (GNSS) signals received in unfavorable environment.
S. Chebir, S. Aidel, K. Rouabah, S. Attia, M. Flissi   +4 more
doaj  

Time-Collaborative Constellation Design With Finite-Alphabet Inputs for Two-User Multi-Access Visible Light Communications

IEEE Photonics Journal, 2019
Ubiquitous light-emitting diodes provide natural infrastructures for multiuser visible light communications (VLCs). However, the current available works for multiuser VLC systems mainly focus on broadcast scenarios and beamforming techniques.
Zhen-Yu Wang, Hong-Yi Yu, Da-Ming Wang
doaj   +1 more source

Navigation constellation availability research based on multi-echelon technique for recoverable item control theory

Xibei Gongye Daxue Xuebao
In view of the problems existing in the current research on backup strategies for constellations, such as the single method and the neglect of short-term satellite failures, as well as the insufficient in-depth study of backup strategies using Markov ...
ZHAO Lingfeng, HUANG Chaowei, LIN Ruoyu, HUANG Shasha, XUE Xiaofeng, FENG Yunwen   +5 more
doaj   +1 more source

A Portfolio Approach to NLOS and Multipath Mitigation in Dense Urban Areas [PDF]

, 2013
Non-line-of-sight (NLOS) reception and multipath interference are major causes of poor GNSS positioning accuracy in dense urban environments. They are commonly grouped together. However, both the mechanisms by which they cause position errors and many of
Groves, PD, Jiang, Z, Rudi, M, Strode, P
core