Architecture and Features of Mobile Communication Satellite System for Mobile Phone by Dong CHEN, Qian ZHANG, Zhaotao QIN, Jincheng TONG

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Bidirectional measurement differential positioning method for LEO communication satellites by WANG Xinyang, ZHAO Yafei, LI Jinkang, PENG Mugen

Subjects: “…low earth orbit communication satellite…”
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A survey on AI techniques applied in the satellite communication/satellite Internet field by Yaqiong LIU, Zhe LYU, Yafei ZHAO, Guochu SHOU

“…The birth of satellite Internet brings new development opportunities, but also many challenges.How artificial intelligence, as an important auxiliary tool, was widely used in the field of satellite communication/satellite Internet in the context of the development of space-air-ground integration, was investigated, which involved communication anti-jamming, communication routing, satellite-terrestrial network system architecture, constellation operation and management and other scenarios.The AI algorithms included traditional machine learning, deep learning, reinforcement learning and so on.Finally, by taking the development trend of the AI applied in the satellite field into consideration, several future research directions were put forward, which provided new ideas and technical solutions for the intelligent development of satellite field in our country.…”
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Low-Orbit Large-Scale Communication Satellite Constellation Configuration Performance Assessment by Tianyu Sun, Min Hu, Chaoming Yun

“…A constellation configuration performance evaluation method is proposed for the performance evaluation of the low-orbit large-scale communication satellite constellations. The practicality and feasibility analysis of the constellation configuration is mainly studied from the constellation coverage performance. …”
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Single-epoch power positioning method for multi-beam LEO communication satellites by Sibo Gao, Sibo Gao, Chunjiang Ma, Chunjiang Ma, Xiaomei Tang, Xiaomei Tang, Feixue Wang, Feixue Wang

“…Low Earth Orbit (LEO) communication satellites offer reduced signal loss, fast movement, multi-beam, typically providing single coverage. …”
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Satellite Selection Strategy and Method for Signals of Opportunity Navigation and Positioning with LEO Communication Satellites by Yanhua Tao, Yang Guo, Shaobo Wang, Chuanqiang Yu, Zimo Zhu

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Design of the Monitoring System for Communication Satellite Information Security Based on Spaceborne Network Probe by Mingjian WANG, Dandan FAN, Xiaoshen XU, Meng LI

Subjects: “…communication satellite…”
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Research on the Architecture of Phased Array Antenna of LEO Communication Satellites Based on Hybrid Beamforming by Rong HU, Xiumei LI, Juan DENG, Jun ZHOU, Shujing DONG, Ling LIU, Wenying MA

“…Due to the characteristics of low earth orbit (LEO) communication satellite system like low propagation loss, small propagation delay and high pointing accuracy, a hybrid architecture-“analog beamforming stage and digital beamforming (DBF) stage” was proposed, and the principle and advantages of hybrid beamforming were analyzed.Through three dimensional integrating of multi-channel RF frontend chips, mixers, dedicated DBF ASIC chips, and tiles phased array anntena arrays, the proposed hybrid beamforming could be expanded or spliced.This hybrid architecture achieved the optimization of performance, cost, complexity and power consumption, and provided a reference for China to build space based internet of things system and reconfi gurable phased array antenna system in the future.…”
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Partially adaptive baeam-forming maethods based on genetic algorithms by JIN Jun1, WANG Hua-li1, LIU Miao2

Subjects: “…communications satellite…”
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Study on satellite adaptive nulling antennas with hybrid genetic algorithm by JIN Jun1, WANG Hua-li1, DUAN Tao2, LIU Yun-zhi1

Subjects: “…communications satellite…”
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Current development of satellite communications technology by GAN Zhong-min, ZHANG Geng-xin

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Loosing no time to deploy digital economy and digital transformation to spur ICT innovation——The latest ICT development trend showcased in the science and technology award of CIC i... by China InstituteofCommunications(CIC)

“…ICT Innovation, industrial development and the new information infrastructure construction, represented by 5G, artificial intelligence, and integrated space-air-ground networks will play an important role in the implementation of the national strategy of building a powerful communications network and comprehensively building a modern socialist country.Based on the current technological development in the ICT field, the China Institute of Communications summarized and sorted out the key directions of technological innovation in this field, including a new generation of mobile communications, network enabling, quantum communications, satellite internet, smart network operation and maintenance, cyberspace security, and the internet of things and the internet of vehicles, network cost reduction and efficiency enhancement, and basic technologies, etc., providing references for all walks of life to understand the technological development in the ICT field.…”
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Ionospheric Storm Scale Index Based on High Time Resolution UPC‐IonSAT Global Ionospheric Maps (IsUG) by Qi Liu, Manuel Hernández‐Pajares, Haixia Lyu, Michi Nishioka, Heng Yang, Enric Monte‐Moreno, Tamara Gulyaeva, Yannick Béniguel, Volker Wilken, Germán Olivares‐Pulido, Raül Orús‐Pérez

“…Abstract The ionospheric storms have adverse effects on the radio communications, satellite communications and also the Global Navigation Satellite Systems (GNSS) application. …”
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Analysis of satellite-terrestrial frequency sharing technology for 5G and 6G mobile communication by HU Yanwei, GONG Jian, MA Zhanshu

“…The frequency sharing technology for 5G and 6G mobile communication satellite-terrestrial integration was analyzed from the perspectives of technology research, policy formulation, and station layout, providing reference for building a satellite-terrestrial integrated global seamless communication system.…”
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Recent development and its prospect of satellite communications by Ke-chu1 YI, Yi LI, Chen-hua SUN, Chun-guo NAN

“…After analyzing the characteristics of satellite communications,the developing status of communication satellite platform,available frequency resource,as well as the related key techniques are summarized.Through introducing some typical satellite communications systems,were presented the applications and industrialization of satellite communications,and furthermore shows the bright prospects.…”
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Mission Planning for LEO Satellite IoT Constellation Based on Genetic Algorithm by Yanhong LI, Qiang LYU, Junmin LIANG, Shigang FENG, Junhou MIAO

“…A mission planning algorithm based on genetic algorithm was designed for LEO satellite IoT constellation with no inter-satellite links, aimed to achieve real-time data communication through multiple ground stations while maximized the resource allocation of satellites and ground stations.Firstly, the objective function to maximized the service duration of satellites in orbit and the constraints on clashed tasks were designed, constructed the mission planning model for LEO satellite IoT constellation.Then, based on genetic algorithm, clashed tasks and early stopping mechanism were introduced, and the mission planning algorithm for the LEO satellite IoT constellation was designed.On this basis, experiments were conducted use a constellation of 18 LEO communication satellites without inter-satellite links and 4 ground stations.In addition, in order to verified the performance of the algorithm, first come first service (FCFS) algorithm was also used for mission planning of the experimental data.The experiments compared with FCFS showed that the designed mission planning algorithm for LEO satellite IoT constellation could significantly improve the scheduling capacity of ground stations for receiving data of communication satellites, addressed the contradiction of insufficient ground stations with a large number of satellites.…”
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Rain attenuation distribution characteristic of Ka band satellite communication by KANG Jian, WANG Yu-fei

“…Using the ITU-R rain attenuation forecasting model,and based on the rainfall data and the geographic location parameters of main cities in our country,the isograms of rain attenuation distribution for the communication satellite with the orbital location 92° E in Ka band（30/20GHz）was presentd.A further analysis was made on the rain attenuation char-acteristic of the Ka band satellite communication system by integrating with the landform and the climate distribution pattern in our country.The results could be used as the theoretical basis when designing the Ka band satellite communica-tion system.…”
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Flexible-Robotic Reflector for Aerospace Applications by Nir Shvalb, Boaz Ben-Moshe, Oded Medina, Raz Itzhaki Tamir

“…In this paper we present a new concept for a dynamic antenna specially designed for communication satellites. The suggested flexible-robotic antenna is based on a dual-reflector structure, where the subreflector has a complex surface shaping robotic mechanism allowing it to fix most of the morphologic errors in the main reflector. …”
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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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Amplitude and phase errors calibration method in satellite-borne dynamic power allocation network by Qi TANG, Jun-min JIANG, Meng XIA

“…For the mobile communication satellite each beam communication traffic distribution was not balanced,leading to differences in transmission power of downlink beam.The implementation architectures of dynamic power allocation network was given,which could allocate the transmitting beam power automatically according to the traffic demand,at the same time ensured the high efficiency of power amplifier.Because the performance of dynamic power allocation network was severely impaired by the mutual coupling among signals when amplitude/phase mismatch was existed,which led to a sharp drop in beam performance.A calibration method for the amplitude and phase errors was proposed.The decoupling of calibration signal was realized by using the cross-correlation orthogonal characteristic of the orthogonal zero-correlation zone (ZCZ) sequences in the zero correlation interval,and communication was free from calibration by reducing the transmit power for the excellent self-correlation characteristic of the ZCZ sequences.Performance simulation and far field test show that under the condition that the calibration signal power is less than the normal signal 10 dB,the amplitude error is less than 0.1 dB,the phase error is less than 0.3°,and the gain loss within the main lobe is less than 0.2 dB after calibration.…”
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