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881
Maritime Autonomous Surface Ship (MASS): Tantangan dan Peluang Kemaritiman Masa Depan
Published 2022-12-01“…This kind of technology commonly depends on Satellite communication in Low-Earth Orbit (LEO), which must be secure for global MASS navigation to prevent mishaps leading to another environmental catastrophe. …”
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882
In-depth investigation of low-energy proton irradiation effect on the structural and photoresponse properties of ε-Ga2O3 thin films
Published 2022-09-01“…With the demand for highly durable devices in harsh environments such as in low earth orbit spacecraft, in-depth understanding of the particle radiation effect on the structural and performance degradation of the device is desired. …”
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883
Thermospheric Mass Density Modelling during Geomagnetic Quiet and Weakly Disturbed Time
Published 2024-01-01“…Atmospheric drag stands out as the predominant non-gravitational force acting on satellites in Low Earth Orbit (LEO), with altitudes below 2000 km. This drag exhibits a strong dependence on the thermospheric mass density (TMD), a parameter of vital significance in the realms of orbit determination, prediction, collision avoidance, and re-entry forecasting. …”
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884
Studying free-space transmission statistics and improving free-space quantum key distribution in the turbulent atmosphere
Published 2012-01-01“…Lastly, we present simulations of a QKD exchange with an orbiting low earth orbit satellite and show that an SNRF will be extremely useful in such a situation, allowing many more passes to extract a secret key than would otherwise be possible.…”
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885
Improved PPP Ambiguity Resolution with the Assistance of Multiple LEO Constellations and Signals
Published 2019-02-01“…The fusion of low earth orbit (LEO) constellation and Global Navigation Satellite Systems (GNSS) can increase the number of visible satellites and optimize spatial geometry, which is expected to improve the performance of precise point positioning (PPP) ambiguity resolution (AR). …”
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886
Diurnal carbon monoxide observed from a geostationary infrared hyperspectral sounder: first result from GIIRS on board FengYun-4B
Published 2023-06-01“…Consistent with CO retrievals from low-Earth-orbit (LEO) infrared sounders, the largest observation sensitivity, as quantified by the averaging kernel (AK), is in the free troposphere at around 3–6 km. …”
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887
Volcanic Cloud Detection and Retrieval Using Satellite Multisensor Observations
Published 2023-02-01“…In this work, we combine the MW-MMW observations with thermal-infrared (TIR) radiometric data from the Low Earth Orbit (LEO) spectroradiometer to have a complete characterisation of volcanic plumes. …”
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888
Handover Strategies for Emerging LEO, MEO, and HEO Satellite Networks
Published 2024-01-01“…The goal is to determine the most suitable HO strategy for each constellation and our results show that this depends on the constellation type, i.e. low earth orbit (LEO), medium earth orbit (MEO) and highly elliptical orbit (HEO), and design. …”
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889
LEO-Constellation-Augmented BDS Precise Orbit Determination Considering Spaceborne Observational Errors
Published 2021-08-01“…The precise orbit determination (POD) accuracy of the Chinese BeiDou Navigation Satellite System (BDS) is still not comparable to that of the Global Positioning System because of the unfavorable geometry of the BDS and the uneven distribution of BDS ground monitoring stations. Fortunately, low Earth orbit (LEO) satellites, serving as fast moving stations, can efficiently improve BDS geometry. …”
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890
Real-Time LEO Satellite Orbits Based on Batch Least-Squares Orbit Determination with Short-Term Orbit Prediction
Published 2022-12-01“…The augmentation of the Global Navigation Satellite System (GNSS) by Low Earth Orbit (LEO) satellites is proposed as an effective method to improve the precision and shorten the convergence time of Precise Point Positioning (PPP). …”
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891
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892
Applying Kuiper Connectivity with Edge Computing to New Industry Verticals
Published 2023“…Large “megaconstellations” comprising hundreds or even thousands of satellites in Low Earth Orbit (LEO) to provide global connectivity coverage have been a goal of satellite operators for decades. …”
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893
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895
Supply, demand, and entrepreneurial ventures in the space launch industry
Published 2005Get full text
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896
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897
Preparation and Characterization of Transparent Polyimide Nanocomposite Films with Potential Applications as Spacecraft Antenna Substrates with Low Dielectric Features and Good Sus...
Published 2021-07-01“…Optically transparent polyimide (PI) films with good dielectric properties and long-term sustainability in atomic-oxygen (AO) environments have been highly desired as antenna substrates in low earth orbit (LEO) aerospace applications. However, PI substrates with low dielectric constant (low-<i>D</i><sub>k</sub>), low dielectric dissipation factor (low-<i>D</i><sub>f</sub>) and high AO resistance have rarely been reported due to the difficulties in achieving both high AO survivability and good dielectric parameters simultaneously. …”
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898
Surface Degradation of Thin-Layer Al/MgF<sub>2</sub> Mirrors under Exposure to Powerful VUV Radiation
Published 2023-10-01“…Damage of such thin-layer coatings has been previously studied under exposure to high-energy electrons/protons fluxes and in low Earth orbit environments. Meanwhile, there is an interest to test the stability of such mirrors under the impact of extreme radiation fluxes from pulsed plasma thrusters as a simulation of emergency onboard situations and other applications. …”
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899
GRACE-FO Antenna Phase Center Modeling and Precise Orbit Determination with Single Receiver Ambiguity Resolution
Published 2021-10-01“…Precise knowledge of the phase center location of the global navigation satellite system (GNSS) antenna is a prerequisite for precise orbit determination (POD) of the low Earth orbit (LEO) satellite. The phase center offset (PCO) and phase center variation (PCV) values for the LEO antenna obtained from ground calibration cannot reflect the error sources encountered in the actual spacecraft environment. …”
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900
Evaluation of deep space exploration risks and mitigations against radiation and microgravity
Published 2023-09-01“…From a biological point-of-view, it can be predicted that exposure to ionizing radiation during missions beyond Low Earth Orbit (LEO) will affect the human body in undesirable ways, e.g., increasing the risks of cataract, cardiovascular and central nervous system diseases, carcinogenesis, as well as accelerated ageing. …”
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