Results 21 to 30 of about 4,735 (260)
Earth Rotation Parameters Estimation Using GPS and SLR Measurements to Multiple LEO Satellites
Remote Sensing, 2021 Earth rotation parameters (ERP) are one of the key parameters in realization of the International Terrestrial Reference Frames (ITRF). At present, the International Laser Ranging Service (ILRS) generates the satellite laser ranging (SLR)-based ERP ...
Xingxing Li +5 more
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Availability Analysis of GNSS Signal in High Orbit [PDF]
Hangkong bingqi, 2021 Global navigation satellite system (GNSS) has the characteristics of strong autonomy, high real-time, high positioning accuracy and low cost, and it has been widely used by ground, low earth orbit (LEO) and medium earth orbit (MEO) users. However, in the
Lu Kewen,Wang Xinlong,Shen Liangliang,Cai Yuanwen,Chen Ding
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Low Earth Orbiting (LEO) Satellite and Orbital Decay
International Journal of Engineering and Advanced Technology, 2022 In this article we present a simple but elegant numerical calculation to study the motion of a low earth orbiting (LEO) satellite in gravitational potential and under the influence of quadratic drag force. We solve a set of coupled differential equations to calculate the instantaneous position and velocity of the satellite and calculate the change in ...
openaire +1 more source
Routing optimization based on topology control in satellite network
Tongxin xuebao, 2018 A new double-layer satellite network model for space networking was established and a routing algorithm based on topology control (TCRA) was proposed considering the advantages of low earth orbit and stationary earth orbit satellite networks.This model ...
Xiaogang QI, Jiulong MA, Lifang LIU
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Limitations of Electromagnetic Ion Cyclotron Wave Observations in Low Earth Orbit [PDF]
Journal of Astronomy and Space Sciences, 2018 Pc1 pulsations are geomagnetic fluctuations in the frequency range of 0.2 to 5 Hz. There have been several observations of Pc1 pulsations in low earth orbit by MAGSAT, DE-2, Viking, Freja, CHAMP, and SWARM satellites.
Junga Hwang +3 more
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Pico-Sat to Ground Control: Optimizing Download Link via Laser Communication
Remote Sensing, 2022 Consider a constellation of over a hundred low Earth orbit satellites that aim to capture every point on Earth at least once a day. Clearly, there is a need to download from each satellite a large set of high-quality images on a daily basis.
Revital Marbel +2 more
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Odessa Astronomical Publications, 2014 The applying of the method of timefrequency analysis allows to reveal the detailed structure of the manifestations of the influence of the space weather's state on the upper atmosphere of the Earth.
V. H. Komendant +3 more
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Extended Geometry and Probability Model for GNSS+ Constellation Performance Evaluation
Remote Sensing, 2020 We proposed an extended geometry and probability model (EGAPM) to analyze the performance of various kinds of (Global Navigation Satellite System) GNSS+ constellation design scenarios in terms of satellite visibility and dilution of precision (DOP) et al.
Lingdong Meng +4 more
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Optimization Design of Routing Algorithm Based on GEO/LEO Double-Layer Satellite Network [PDF]
Jisuanji gongcheng, 2020 Satellite network topology is temporally variant,causing frequent link interruption and end to end long delay between satellites.To address the problem,this paper constructs a double-layer network architecture for satellites on Geosynchronous Earth Orbit(
ZHANG Taijiang, LI Yongjun, ZHAO Shanghong
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Molecular Oncology, EarlyView.Drug resistance limits treatment success in a subset of lung cancers driven by ROS1 gene alterations. Using patient‐derived cells and computer simulations, we studied three key mutations and how they affect five targeted drugs. The mutations reduced drug effectiveness in different ways by altering protein structure and behavior.
Farhan Ul Haq +8 more
wiley +1 more source