Results 1 to 10 of about 2,787,600 (274)
Modeling of the Marine atmosphere and its impact on Ka-band channels [PDF]
MATEC Web of Conferences, 2022 The sea atmosphere environment will affect the Ka frequency channel in TT&C. Firstly, this paper briefly introduces the Marine atmospheric environment. Attenuation models of water vapor solubility and rainfall intensity are established.
Liu Zheng, Sun Fu-an, Zhou Bin
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Research on the phase-frequency relationship of the field effect amplifier front-end of shipborne USB system [PDF]
MATEC Web of Conferences, 2022 Normally, most researches on phase calibration of shipborne USB system focus on the means of phase calibration. This article starts with the research on the channel of the system.
Sun Fuan, Liu Zheng, Liu Huifeng
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A Review of Multibeam Phased Array Antennas as LEO Satellite Constellation Ground Station
IEEE Access, 2021 Small satellites in low Earth orbit (LEO) are typically organized as a satellite constellation. The satellite number of a LEO satellite constellation would be several hundred or even tens of thousands to realize a fully global coverage.
Guolong He +3 more
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Tracking and back‐tracking [PDF]
Progress in Photovoltaics: Research and Applications, 2011 AbstractThis paper presents a review of back‐tracking geometry not only for single axis but also for two‐axis tracking and analyses the corresponding energy gains. It compares the different back‐tracking strategies with the ideal tracking in terms of energy yield concluding, on the one hand, that back‐tracking is more useful for single horizontal axis ...
Lorenzo Pigueiras, Eduardo +2 more
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Losing Track by Tracking Speckles [PDF]
JACC: Cardiovascular Imaging, 2018 No abstract available.
Pellicori, Pierpaolo +2 more
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The adaptive neural network fuzzy sliding mode control for the 3-RRS parallel manipulator
Advances in Mechanical Engineering, 2022 In order to improve the high-precision tracking control of angle variables and the sliding mode equivalent control part for the 3-RRS parallel manipulator, an adaptive neural network fuzzy sliding mode control algorithm with self-adjusting switching gain
Xiyu Li +7 more
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Impact Analysis and Calibration Methods of Excitation Errors for Phased Array Antennas
IEEE Access, 2021 Phased array antennas have played a very important role in many different areas and applications. It requires precise excitation of each antenna element by various synthesis techniques to obtain desired array pattern features.
Guolong He, Xin Gao, Rentian Zhang
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Digital resignation and the datafied welfare state
Big Data & Society, 2023 This commentary calls for further research into digital resignation within non-market contexts, particularly in relation to the datafied welfare state, as distinct from commercial big tech platforms. We aim to nuance the concept of digital resignation by
Christoffer Bagger +4 more
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Photonics, 2023 The small number of pixels in the current linear mode avalanche photodiode (LM-APD) array limits its three-dimensional (3D) imaging resolution. We use an optical phased array-based beam array subdivided pixel method to improve the 3D imaging resolution ...
Shuai Wang +7 more
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ESAIM: Control, Optimisation and Calculus of Variations, 2004 Summary: The problem of invariant output tracking is considered: given a control system admitting a symmetry group \(G\), design a feedback such that the closed-loop system tracks a desired output reference and is invariant under the action of \(G\). Invariant output errors are defined as a set of scalar invariants of \(G\); they are calculated with ...
Martin, Philippe +2 more
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