Results 51 to 60 of about 2,316,300 (349)

Terrestrial ecosystem production: A process model based on global satellite and surface data

, 1993
This paper presents a modeling approach aimed at seasonal resolution of global climatic and edaphic controls on patterns of terrestrial ecosystem production and soil microbial respiration.
C. Potter, J. Randerson, C. Field, P. Matson, P. Vitousek, H. Mooney, S. Klooster   +6 more
semanticscholar   +1 more source

Using publicly available satellite imagery and deep learning to understand economic well-being in Africa

Nature Communications, 2020
Accurate and comprehensive measurements of economic well-being are fundamental inputs into both research and policy, but such measures are unavailable at a local level in many parts of the world. Here we train deep learning models to predict survey-based
Christopher Yeh, Anthony Perez, Anne Driscoll, G. Azzari, Zhongyi Tang, D. Lobell, Stefano Ermon, M. Burke   +7 more
semanticscholar   +1 more source

Next Generation High Throughput Satellite System [PDF]

, 2012
This paper aims at presenting an overview of the state-of-the-art in High Throughput Satellite (HTS) systems for Fixed Satellite Services (FSS) and High Density-FSS.
Alberty, Eric, Bousquet, Michel, Lacan, Jérôme, Radzik, José, Verelst, Greet, Vidal, Oriol   +5 more
core   +1 more source

A technical comparison of three low earth orbit satellite constellation systems to provide global broadband

Acta Astronautica, 2019
The idea of providing Internet access from space has made a strong comeback in recent years. After a relatively quiet period following the setbacks suffered by the projects proposed in the ’90s, a new wave of proposals for large constellations of low ...
Iñigo Del Portillo, B. Cameron, E. Crawley   +2 more
semanticscholar   +1 more source

Method of Tower-less Calibration for Phase Parameter of Tracking System

MATEC Web of Conferences, 2015
This paper introduced the principle of angle errors in tracking system. The demodulation was only related to signal envelop, and supported the phase calibration of radio star.
Ge Tiezhi, Wei Mingshan, Su Qiang, Huang Longcheng, Quan Gang   +4 more
doaj   +1 more source

Review of PPP–RTK: achievements, challenges, and opportunities

Satellite Navigation, 2022
The PPP–RTK method, which combines the concepts of Precise of Point Positioning (PPP) and Real-Time Kinematic (RTK), is proposed to provide a centimeter-accuracy positioning service for an unlimited number of users.
Xingxing Li, Jiaxin Huang, Xin Li, Zhiheng Shen, Junjie Han, Linyang Li, Bo Wang   +6 more
doaj   +1 more source

HDAC4 regulates satellite cell proliferation and differentiation by targeting P21 and Sharp1 genes [PDF]

, 2018
Skeletal muscle exhibits a high regenerative capacity, mainly due to the ability of satellite cells to replicate and differentiate in response to appropriate stimuli. Epigenetic control is effective at different stages of this process.
Adamo, Sergio, Bertin, Marco, Bianchi, Marzia, Consalvi, Silvia, De Bardi, Marco, Marroncelli, Nicoletta, Moresi, Viviana, Palacios, Daniela, Puri Pier, Lorenzo, Saccone, Valentina   +9 more
core   +2 more sources

A Survey on Technologies, Standards and Open Challenges in Satellite IoT

IEEE Communications Surveys and Tutorials, 2021
The Internet of Things (IoT) is expected to bring new opportunities for improving several services for the Society, from transportation to agriculture, from smart cities to fleet management.
Marco Centenaro, C. Costa, F. Granelli, C. Sacchi, L. Vangelista   +4 more
semanticscholar   +1 more source

Real-time service performances of BDS-3 and Galileo constellations with a linear satellite clock correction models

Satellite Navigation, 2023
In order to facilitate high-precision and real-time Precise Point Positioning (PPP), the International GNSS (Global Navigation Satellite System) Service (IGS), BDS-3 (BeiDou-3 Navigation Satellite System), and Galileo navigation satellite system (Galileo)
Haojun Li, Danzeng Luojie, Huimin Ding
doaj   +1 more source

Experimental Demonstration of High-Security and Low-CSPR Single-Sideband Transmission System Based on 3D Lorenz Chaotic Encryption

Photonics
Broadcast-style downlinks (e.g., PONs and satellites) expose physical waveforms despite transport-layer cryptography, motivating physical-layer encryption (PLE).
Chao Yu, Angli Zhu, Hanqing Yu, Yuanfeng Li, Mu Yang, Peijin Hu, Haoran Zhang, Xuan Chen, Hao Qi, Deqian Wang, Yiang Qin, Xiangning Zhong, Dong Zhao, Yue Liu   +13 more
doaj   +1 more source