Results 71 to 80 of about 63,794 (294)
A new multipath mitigation method for GNSS receivers based on antenna array [PDF]
, 2012 the potential of small antenna array for multipath mitigation in GNSS systems is considered in this paper. To discriminate the different incoming signals (Line of sight and multipaths), a new implementation of the well known SAGE algorithm is proposed ...
Carrie, Guillaume +4 more
core +5 more sources
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, EarlyView.A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha +14 more
wiley +1 more source
Research on algorithm based on sliding-window integral Doppler smoothing pseudorange
Dianzi Jishu Yingyong, 2018 The navigation signals can be blocked, faded and interfered, when a satellite navigation receiver is carried by high dynamic vehicles and working in complex environments.
Yin Biao, Geng Shengqun, Zhao Yun
doaj +1 more source
Evaluation of Geometric and Atmospheric Doppler for GNSS-RO Payloads [PDF]
AUT Journal of Electrical Engineering, 2017 To reduce the sampling rate in global navigation satellite system (GNSS)-radio occultation receivers, it is essential to establish a suitable estimation of Doppler frequency from the received signal in the satellite onboard receiver.
L. Mohammadi +2 more
doaj +1 more source
Advanced Materials, EarlyView.This study reports the fabrication of MRI‐compatible elastomeric micro‐balloons via a multi‐step bubble casting process, where the monolithic elastomeric wall is selectively stiffened for reversible and controlled inflation and elasticity, depending on the target vessels for graded occlusion of cerebral arteries.
Jong Bin Kim +10 more
wiley +1 more source
Analysis of Instantaneous Doppler Positioning Performance Based on LEO Satellite Ephemeris Errors
Remote SensingTo address the limitations of Global Navigation Satellite Systems (GNSSs), such as vulnerability to electromagnetic interference and weak ground signal power, signal of opportunity (SOP) provided by low Earth orbit (LEO) satellites can serve as a backup ...
Xingyu Shi +8 more
doaj +1 more source
A New Array Pseudolites Technology for High Precision Indoor Positioning
IEEE Access, 2019 Global Satellite Navigation System (GNSS) can't provide normal location service in the indoor environment because the signal can be blocked by buildings. The pseudolites system can supplement GNSS, especially in the indoor environments.
Xingli Gan +8 more
doaj +1 more source
Advanced Materials Technologies, EarlyView.This study explores how machine learning models, trained on small experimental datasets obtained via Phase Doppler Anemometry (PDA), can accurately predict droplet size (D32) in ultrasonic spray coating (USSC). By capturing the influence of ink complexity (solvent, polymer, nanoparticles), power, and flow rate, the model enables precise droplet control
Pieter Verding +5 more
wiley +1 more source
Ambiguity resolution for satellite Doppler positioning systems [PDF]
A test for ambiguity resolution was derived which was the most powerful in the sense that it maximized the probability of a correct decision. When systematic error sources were properly included in the least squares reduction process to yield an optimal ...
Argentiero, P. D., Marini, J. W.
core +1 more source
Space Place: Mapping the Watery Hills and Dales [PDF]
, 2001 This classroom activity explains how the Global Positioning System (GPS) satellites work to provide precise location information to positions on the ground, as well as to other satellites whose job is to map the surface of Earth.
core