Showing 381 - 400 results of 1,064 for search '"low Earth orbit"', query time: 0.14s Refine Results
  1. 381

    Nuclear fragmentation cross section measurements with the FOOT experiment by Ridolfi Riccardo

    Published 2023-01-01
    “…On the radioprotection side, the interest in long-term manned space missions beyond Low Earth Orbit is growing in these years but it has to cope with significant health concerns from radiation in space, necessitating an accurate cross section data description. …”
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    Article
  2. 382

    Performance analysis of DSSS- and CSS-based physical layer for IoT transmission over LEO satellites by Sooyeob Jung, Gyeongrae Im, Dong-Hyun Jung, Pansoo Kim, Joon Gyu Ryu, Joonhyuk Kang

    Published 2022-08-01
    “…To determine a suitable waveform for Internet of Things (IoT) transmission over low-Earth orbit (LEO) satellites, this paper reports the results of a performance comparison between chirp spread spectrum (CSS)-based LoRa and direct sequence spread spectrum (DSSS)-based Ingenu. …”
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    Article
  3. 383

    Key Generation Method Based on Multi-Satellite Cooperation and Random Perturbation by Yinuo Hao, Pengcheng Mu, Huiming Wang, Liang Jin

    Published 2021-12-01
    “…In low-earth-orbit (LEO) satellite-to-ground communication, the size of satellite antennae is limited and the satellite motion trajectory is predictable, which makes the channel state information (CSI) of the satellite-to-ground channel easy to leak and impossible to use to generate a physical layer key. …”
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    Article
  4. 384

    Complex MIMO RBF Neural Networks for Transmitter Beamforming over Nonlinear Channels by Kayol Soares Mayer, Jonathan Aguiar Soares, Dalton Soares Arantes

    Published 2020-01-01
    “…The use of beamforming for efficient transmission has already been successfully implemented in practical systems and is absolutely necessary to even further increase spectral and energy efficiencies in some configurations of the next-generation wireless systems and for low earth orbit satellites. A remarkable capacity increase is then achieved and spectral congestion is minimized. …”
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    Article
  5. 385

    A Distributed Formation Joint Network Navigation and Positioning Algorithm by Lvyang Ye, Yikang Yang, Jiangang Ma, Lingyu Deng, Hengnian Li

    Published 2022-05-01
    “…In view of the problem that the leader-follower joint navigation scheme relies too much on the absolute navigation and positioning accuracy of the leader node, under the conditions of distributed network-centric warfare (NCW) and to meet the location service accuracy, reliability, and synergy efficiency of the future integrated communication, navigation (ICN), we built a joint navigation and positioning system with low Earth orbit (LEO), airborne data link, and inertial navigation system (INS) as the core; designed a ranging and time-synchronization scheme of the joint navigation and positioning system; and established a joint navigation and positioning method for formation and networking based on mutual ranging and velocity measurement information between aircrafts. …”
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    Article
  6. 386

    Efficient Resource Allocation for Beam-Hopping-Based Multi-Satellite Communication Systems by Yingjie Wang, Ming Zeng, Zesong Fei

    Published 2023-05-01
    “…With the rapid growth of data traffic, low earth orbit (LEO) satellite communication networks have gradually ushered in a new trend of development due to its advantages of low latency, wide coverage, and high capacity. …”
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    Article
  7. 387

    RSOnet: An Image-Processing Framework for a Dual-Purpose Star Tracker as an Opportunistic Space Surveillance Sensor by Siddharth Dave, Ryan Clark, Regina S. K. Lee

    Published 2022-07-01
    “…Novel data collection regimes are needed to scale our ability to detect, track, classify and characterize resident space objects in a crowded low Earth orbit. This research presents RSOnet, an image-processing framework for space domain awareness using star trackers. …”
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    Article
  8. 388

    Design and Fabrication of Broad-Beam Microstrip Antenna Using Parasitic Patches and Cavity-Backed Slot Coupling by Thana Puklibmoung, Worawat Sa-Ngiamvibool

    Published 2022-02-01
    “…In particular, this realizing antenna covers the low earth orbit (LEO) satellite beam.…”
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    Article
  9. 389

    Proposed Orbital Products for Positioning Using Mega-Constellation LEO Satellites by Kan Wang, Ahmed El-Mowafy

    Published 2020-10-01
    “…With thousands of low Earth orbit (LEO) satellites to be launched in the near future, LEO mega-constellations are supposed to significantly change the positioning and navigation service for ground users. …”
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    Article
  10. 390

    Traffic simulation of broadband LEO constellation satellite communication system by Xu Jun, Lu Wei, Zhang Gengxin

    Published 2019-03-01
    “…Due to the rapid development of small satellite technology,and the advantages of low earth orbit satellite(LEO) with low delay and low propagation loss as compared with the traditional geosynchronous orbit satellite(GEO), the broadband LEO constellation satellite communication system has gradually become one of the most important hot spots in the field of satellite communications. …”
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    Article
  11. 391

    Satellite-Assisted Disrupted Communications: IoT Case Study by Georgios Koukis, Vassilis Tsaoussidis

    Published 2023-12-01
    “…This study explored the utility of Low-Earth Orbit (LEO) satellite constellations as a communication infrastructure for interconnecting “smart” devices via ground stations in Internet of Things (IoT) scenarios. …”
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    Article
  12. 392

    Comparison between Different Re-Entry Technologies for Debris Mitigation in LEO by Francesco Barato

    Published 2022-10-01
    “…The population of satellites in Low Earth Orbit is predicted to growth exponentially in the next decade due to the proliferation of small-sat constellations. …”
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    Article
  13. 393

    Micro Satellite Orbital Boost by Electrodynamic Tethers by Peter Yao, Timothy Sands

    Published 2021-07-01
    “…The spacecraft-tether system dynamics in low Earth orbit are simulated to evaluate the effects of Lorentz force and torques on translational motion. …”
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    Article
  14. 394

    Design and Implementation of LEO-5G Downlink Synchronization Algorithm based on FPGA by Wei ZENG, Jun-qiu XIAO, Huan XIA, Lei TAN, Peng ZHANG

    Published 2022-04-01
    “…In response to the urgent need for the development of low-orbit 5th Generation Mobile Networks (5G) protocol standards, R16 protocol standards and terminal baseband chips based on 5G low-orbit broadband satellite communication systems, a Primary Synchronization Signal (PSS) detection algorithm of " two blocks combined and divided into two cross-correlation" is proposed for coarse frequency offset estimation based on the analysis of the Low Earth Orbit (LEO)-5G system's PBCH link structure and downlink time-frequency synchronization overall architecture. …”
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    Article
  15. 395

    Inter-Satellite Link Channel Management For Mobile Satellite Systems by Anthony Dass, Angeline

    Published 2003
    “…Low Earth Orbit (LEO) satellite constellations are foreseen as appropriate alternatives to the geostationary satellite systems for providing global personal communications services (PCS). …”
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    Thesis
  16. 396

    Experimental Investigation of the Electrical Wiring Configuration of the HK40 Hall Thruster Operation by Ugur Kokal, Nazli Turana, Murat Celik

    Published 2023-10-01
    “… Vacuum chambers providing a low pressure environment similar to the vacuum environment in low earth orbit have been used for the testing of plasma thrusters. …”
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    Article
  17. 397

    Towards Client Selection in Satellite Federated Learning by Changhao Wu, Siyang He, Zengshan Yin, Chongbin Guo

    Published 2024-02-01
    “…Large-scale low Earth orbit (LEO) remote satellite constellations have become a brand new, massive source of space data. …”
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    Article
  18. 398

    LoRaWAN CubeSat with an Adaptive Data Rate: An Experimental Analysis of Path Loss Link Margin by Syed Zafar Abbas Mehdi, Aiffah Mohd Ali, Safiah Zulkifli

    Published 2023-01-01
    “…Long Range (LoRa) is one of the most practical technologies due to its low-power and long-range capabilities to be used by the Low Earth Orbit (LEO) CubeSat. This study aims to evaluate the performance of the Long Range Wide Area Network (LoRaWAN) in receiving uplink messages from ground sensor nodes at an altitude of 550 km with a maximum elevation angle of 0°. …”
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    Article
  19. 399

    Analysis of Orbital Lifetime Prediction Parameters in Preparation for Post-Mission Disposal by Ha–Yeon Choi, Hae-Dong Kim, Jae-Dong Seong

    Published 2015-12-01
    “…Atmospheric drag force is an important source of perturbation of Low Earth Orbit (LEO) orbit satellites, and solar activity is a major factor for changes in atmospheric density. …”
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    Article
  20. 400

    Establishing the Capabilities of the Murchison Widefield Array as a Passive Radar for the Surveillance of Space by Brendan Hennessy, Mark Rutten, Robert Young, Steven Tingay, Ashley Summers, Daniel Gustainis, Brian Crosse, Marcin Sokolowski

    Published 2022-05-01
    “…The results demonstrate the Murchison Widefield Array is able to provide widefield and persistent coverage of objects in low Earth orbit.…”
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    Article