Machine Learning Based Modeling of Thermospheric Mass Density by Qian Pan, Chao Xiong, Hermann Lühr, Artem Smirnov, Yuyang Huang, Chunyu Xu, Xu Yang, Yunliang Zhou, Yang Hu

“…The MBiLE model was trained by using only the thermospheric mass density from Swarm C satellite at ∼450 km altitude. To assess the performance of the MBiLE model, the model predictions were compared with observations from several satellites, namely, the Swarm C, the Challenging Minisatellite Payload (CHAMP) and the Gravity Field and Steady‐State Ocean Circulation Explorer (GOCE) satellites. …”
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Novel key management and authentication scheme for ad hoc space networks by YANG De-ming, MU De-jun, XU Zhong

“…To be implemented using a flexible distributed architecture consisting of a constellation of dynamically de-ployed or configured satellites that were networked together into an integrated information system,the satellites could form an ad hoc self-organizational network,which posed unique challenges to security for the network.A novel and flexible security architecture was proposed,which aimed to provide public key infrastructure and authentication scheme.Based on the absolute distributed certificate authority almost any standard public-key-based authentication protocol could be adopted directly.In cases where the space nodes involved were extremely limited in computational resources,a light-weight authentication scheme that provided integrity and confidentiality based on cryptographic hash functions and symmetric key cryptography was proposed.…”
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Heterogeneous resource cooperative game in space-ground computing power network by Yutong ZHANG, Yuming PENG, Boya DI, Lingyang SONG

“…To deal with the resource competition among satellites in the multi-satellite space-ground computing network, a space-ground heterogeneous resource cooperative game mechanism was designed in terms of the computing and spectrum domains.Each satellite published a computing task which was independent of other tasks and relied on UE to generate raw data.By competing the resources of user terminals and UE, the task offloading and processing was achieved.To provide real-time data services, a distributed scheme was proposed based on multi-agent reinforcement learning to coordinate the computing and spectrum resource competition among satellites, thereby minimizing the system latency.Simulation results indicated that, compared with the existing schemes, the proposed algorithm achieves a lower system latency by fully utilizing the computing and spectrum resources and coordinating the resource competition.…”
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Communication and navigation integration for LEO constellations:status, opportunities, and challenges by Yafei ZHAO, Bing YAN, Yaohua SUN, Mugen PENG

“…With the growing maturity of millimeter wave technology and high-throughput satellite communication technology, as well as the urgent need for global broadband communication services, the construction of LEO giant communication constellation has attracted great attention, and up to thousands of satellites have been deployed.A large number of LEO communication satellites have realized multiple and repeated coverage of high-frequency radio frequency signals on the ground.At the same time, ground communication resources provide a hardware platform for signal reception and create conditions for the development of integrated communication and navigation.The status quo, opportunities and challenges of the integrated LEO navigation constellation were discussed, and the differences of resources required by the integrated LEO navigation constellation and the global navigation satellite system were emphatically expounded.In terms of space segment, ground segment and user segment, the conclusions and prospects for future research were presented.…”
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A‐CHAIM: Near‐Real‐Time Data Assimilation of the High Latitude Ionosphere With a Particle Filter by Ben Reid, David R. Themens, Anthony McCaffrey, P. T. Jayachandran, Magnar G. Johnsen, Thomas Ulich

“…In the topside, A‐CHAIM demonstrates a 15%–20% reduction in error for the Swarm satellites, and a 23%–28% reduction in error for the DMSP satellites. …”
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Specifying High Altitude Electrons Using Low‐Altitude LEO Systems: Updates to the SHELLS Model by A. J. Boyd, J. C. Green, T. P. O’Brien, S. G. Claudepierre

“…Abstract We describe a new version of the SHELLS model, which specifies the outer electron belt environment as observed by the Van Allen Probes using the Kp Index and data from Polar‐orbiting Operational Environmental Satellites and the Meteorological Operational satellites as inputs. …”
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Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time by Thomas A. Daggitt, Richard B. Horne, Sarah A. Glauert, Giulio DelZanna, Mervyn P. Freeman

“…These differences demonstrate that both satellite L* and magnetic local time must be taken into account when modeling rapid variations in the outer radiation belt, and at least three satellites in geostationary orbit, ideally more, may be required for accurate forecasting and reconstruction of these events on timescales shorter than days.…”
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Relativistic Electron Flux Prediction at Geosynchronous Orbit Based on the Neural Network and the Quantile Regression Method by Hui Zhang, Suiyan Fu, Lun Xie, Duo Zhao, Chao Yue, Zuyin Pu, Ying Xiong, Tong Wu, Shaojie Zhao, Yixin Sun, Bo Cui, Zhekai Luo

“…Abstract Geosynchronous satellites are exposed to the relativistic electrons, which may cause irreparable damage to the satellites. …”
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Design and manufacture of CubeSat-type nanosatellite thermal subsystem by Braulio Peraza-Acosta, Jesús Irán Grageda-Arellano, Carlos Couder-Castañeda, Jaime Meléndez-Martínez, Diego Alfredo Padilla-Pérez, Arturo Solis-Santome

“…The design encompasses two stages: regulating the satellite’s temperature range through implementing passive control based on multilayer coatings and an electronic board capable of measuring the internal surface temperature of each of the satellite’s six faces. …”
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User Behavior Traffi c Replay Technology for Space-IntegratedGround Information Network Based on Profi le Analyzing by Qingsong XUE, Xiaofeng WANG

“…Faced the needs of user behavior emulation of the space-integrated-ground information network with complex behaviors and diverse protocols, an architecture based on cloud computing and virtualization technologies for replaying user behavior traffi c in the spaceintegrated-ground information network was designed.Furthermore, a user behavior traffi c automatic analysis and traffi c profi le generation technology based on deep packet inspection, and a user behavior traffi c replay technology of the space-integrated-ground information network based on traffi c profi le were researched, to achieve unifi ed, automated, and realistic simulation of miscellaneous kinds of user behavior traffi c.An emulation scenario of a space-integrated-ground information network with 6 space-based backbone network satellites and 66 space-based access network satellites was constructed.The experimental verifi cation of protocol traffi c profi le generation and traffi c replay of the broadband user behavior and narrow-band user behavior showed that the emulation of diversifi ed user interaction behaviors could provide eff ective support for the emulation of the space-integrated-ground information network.…”
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Thermal Design and Experimental Validation of a Lightweight Microsatellite by Hongzhou Huang, Changgen Bu

“…The multiple working modes, complex working conditions, frequent changes in external heat flux, and high-power consumption of satellites all pose great difficulties to their thermal design. …”
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Passive Radar-Based Parameter Estimation of Low Earth Orbit Debris Targets by Justin K. A. Henry, Ram M. Narayanan

“…These objects continue to grow in number as satellites are imploded and space debris impacts each other, causing fragmentation. …”
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Integrity Monitoring Technology of Mixed Constellation of High, Medium and Low Orbit Navigation Based on Genetic Algorithm Star Selection by Zhengcheng WU, Shaojie NI, Wenxiang LIU, Wei XIAO, Zongnan LI

“…Low-orbit satellites are widely used in communication, navigation, remote sensing and other fields, which is of great significance to meet the needs of communication and improve the accuracy of navigation and positioning.Integrity technology is an important guarantee for the safe and reliable operation of satellite navigation system.With the mature development of low orbit technology and the gradual application of a large number of low orbit satellites, it is urgent to develop the system integrity monitoring technology under the condition of mixed constellation of high and low orbits.This paper proposed a hybrid constellation integrity monitoring technology for high, middle and low orbit navigation based on genetic algorithm for star selection.On the basis of the traditional optimal geometric accuracy factor selection method, genetic algorithm was introduced to construct a fitness factor based on the linear weighted feature slope of the satellite geometric observation matrix, so as to achieve rapid convergence of user protection level to protection limit.This method further improved the integrity of the receiver by optimizing the way of star selection.Under the accuracy requirement of CAT I, for the ＆quot;BeiDou+StarNet-1＆quot; constellation, the global availability level of the proposed algorithm was 5.60%, and the enhancement effect was the best for the mid-latitude and low-latitude of the Eastern Hemisphere, which were increased by 7.01% and 6.42%, respectively.…”
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Evaluation of SaRIF High‐Energy Electron Reconstructions and Forecasts by S. A. Glauert, R. B. Horne, P. Kirsch

“…Abstract Increasing numbers of satellites are orbiting through the Earth's radiation belts, and the range of orbits being commonly used is also growing. …”
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ANÁLISIS ESPECTRAL DE NUBES DE SAL ORIGINADAS EN LAS CERCANÍAS DE LA LAGUNA DE MAR CHIQUITA UTILIZANDO SENSORES REMOTOS by Diana Rodriguez, Silvana Carina Bolzi, Ines Velazco, Mónica Marino

“…From 2006 observations from space with different satellites allowed document the presence of white clouds originating from the salt that is raised from the ground with intensity winds occur. …”
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The Refraction Correction of Elevation Angle for the Mean Annual Global Reference Atmosphere by Leke Lin, Xiangming Chen, Ranran Hu, Zhenwei Zhao

“…In some frequency-sharing studies between fixed service and space radiocommunication services, including fixed-satellite, broadcasting-satellite, and space science services, it is necessary to estimate the apparent elevation angle of a space station, taking into account the atmospheric refraction. …”
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Two-Echelon Pickup and Delivery Problem Using Public Transport in City Logistics by Shuai Wang, Xiaoning Zhu, Pan Shang, Wenqian Liu, Xiao Lin, Lóránt Tavasszy

“…The satellites are located at the echelon borders to transfer commodities between echelons. …”
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A Smart Electronic Tagging System Based on Context Awareness and Machine-to-Machine Interworking by Gil-Yong Lee, Nam-Yeol Yun, Sung-Chul Lee, Soo-Hyun Park

“…The existing electronic tagging system traces the location of a sex offender using triangulation by communicating with Global Positioning System (GPS) satellites and mobile phone base stations. The acquired location information is used to prevent the offenders from perpetrating repeat crimes. …”
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Assessments of F16 Special Sensor Microwave Imager and Sounder Antenna Temperatures at Lower Atmospheric Sounding Channels by Banghua Yan, Fuzhong Weng

“…The main reflector of the Special Sensor Microwave Imager/Sounder (SSMIS) aboard the Defense Meteorological Satellite Program (DMSP) F-16 satellite emits variable radiation, and the SSMIS warm calibration load is intruded by direct and indirect solar radiation. …”
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Atmospheric Ionizations by Solar X‐Rays, Solar Protons, and Radiation Belt Electrons in September 2017 Space Weather Event by Kiyoka Murase, Ryuho Kataoka, Takanori Nishiyama, Kaoru Sato, Masaki Tsutsumi, Yoshimasa Tanaka, Yasunobu Ogawa, Tatsuhiko Sato

“…We conclude that the PHITS simulation results reasonably reproduce (within the error of a factor of two) those ionizations measured by ground‐based instruments with inputs of observed ionization sources by satellites.…”
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