Results 21 to 30 of about 33,853 (258)
Remote Sensing, 2021 The development of small-satellite technologies allows the low Earth orbit intersatellite link (LEO-LEO) occultation method to observe the Earth’s atmosphere with global coverage and acceptable costs using electromagnetic signals, in which the L/X/K/M ...
Congliang Liu +10 more
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Unified Constellation Design Using Projection Over QAM: Concept and Examples
IEEE Open Journal of the Communications Society, 2023 Beyond fifth generation (B5G) / sixth generation (6G) wireless systems require full utilization of all spectrums. However, hardware devices operating in the high-frequency bands bring a series of non-ideal behaviors, including nonlinear distortion caused
Xiaorui Yan +6 more
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Multi-objective optimization of earth cooperative observation hybrid satellite constellation
Xibei Gongye Daxue Xuebao, 2021 As the demand for comprehensiveness, accuracy, and data fast return of satellite remote sensing information grows, a hybrid constellation with permanent inter-satellite link becomes an inevitable choice for earth cooperative observation.
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Remote Sensing, 2022 The Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) provided twenty years of data on Earth’s time-varying gravity field.
Carlos M. A. Deccia +2 more
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NGSO Constellation Design for Global Connectivity
CoRR, 2022 Book chapter submitted to IET Non-Geostationary Satellite Communications ...
Israel Leyva-Mayorga +6 more
openaire +2 more sources
On the performance of improved quadrature spatial modulation
ETRI Journal, 2020 Quadrature spatial modulation (QSM) utilizes the in‐phase and quadrature spatial dimensions to transmit the real and imaginary parts of a single signal symbol, respectively.
Tasnim Holoubi +3 more
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Spatial and Temporal Sampling Properties of a Large GNSS-R Satellite Constellation
Remote Sensing, 2023 Using large constellations of smallsats, mission designers can improve sampling density and coverage. We develop performance metrics that characterize key sampling properties for applications in numerical weather prediction and optimize orbit design ...
Jack Winkelried +2 more
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Design and Simulation of Stellar Occultation Infrared Band Constellation
Remote Sensing, 2022 This study provides an in-depth analysis of the characteristics of stellar occultation events. Using 10 target star sources, the influence of orbital elements on the number, duration, and distribution of stellar occultation events was simulated and ...
Qinglin Zhu +3 more
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Optimization of satellite resource scheduling under regional target coverage conditions
Open Astronomy, 2022 This study presented a mathematical description of an arbitrary shape area, and after analyzing the characteristics of the near-polar orbital co-ground trajectory constellation that satisfies the revisit interval constraint, an optimization model of the ...
Liu Kaixi +5 more
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Unitary Space-Time Modulation Based on Coherent Codes
Sensors, 2022 This paper analyzes the relationship between pilot symbol-assisted modulation (PSAM) and unitary space-time modulation (USTM). In particular, we present a map that transforms any PSAM into a USTM and vice versa.
Daniel Calabuig
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