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20 March 2021, Volume 2 Issue 1

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Review

Development and Prospect of Satellite 5G Technology

Lijun ZHAI, Shuming PAN, Chunting WANG

2021, 2(1):  1-10.  doi:10.11959/j.issn.2096-8930.2021001

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With the development of new broadband satellite communication constellation, the fusion of satellite communication and 5G has become a hot spot in the communication industry.The current status of the development of satellite 5G was summarized, and the work achievements of 3GPP, ITU, SaT5G and other international standard development organizations were introduced.On the basis, the overall architecture of satellite 5G network was proposed, the research and development were introduced such as networking under the condition of satellite dynamic topology, multi band satellite ground integration waveform design, multiple access to satellite IoT terminal, radio resource management and interference coordination.In addition, the feasibility of new technologies such as OTFS, nonorthogonal multiple access and interference coordination of NGSO and GSO based on spectrum sensing were explored.Finally, the development of the 6G phase of integrated satellite and terrestrial networks was presented.

Topics: Effective Utilization of Spectrum in Space-Integrated-Ground Information Network

Research on the Infl uence of Earth Station Tracking Modes on Frequency Compatibility Evaluation Between NGSO-GSO Systems

Xiujuan YAO, Suhui DONG, Xiang GAO, Jing WANG, Jia ZHI, Yunlong SUN

2021, 2(1):  11-19.  doi:10.11959/j.issn.2096-8930.2021002

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Aiming at the simulation analysis scenarios of frequency compatibility between NGSO constellation system and GSO satellite system in the Ka uplink and Ku downlink frequency band, one tracking mode of the earth station of NGSO constellation was proposed.By calculation results analysis, the quantitative infl uence was depicted in common tracking mode of the earth station, such as ephemeris guided tracking, single pulse automatic tracking, and sidelobe tracking.And taking the parameters registered on ITU of Telesat and CHNSAT-98E systems as an example, the simulation data was compared and analyzed in diff erent tracking modes of the earth station.Then, one available tracking strategy of the NGSO constellation station was proposed, which is under the constraint of recommendation ITU-R S.1323.The research results can be used as a reference for NGSO-GSO system compatibility analysis, also the tracking plan formulation of earth stations.

Research on Scenarios and Modeling of Co-Frequency Interference Between NGSO Communication Constellation Systems

Wei LI, Kang YAN, Jingru GENG, Wen WANG

2021, 2(1):  20-27.  doi:10.11959/j.issn.2096-8930.2021003

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Aiming at the serious problem of frequency overlapping among non-geostationary satellite orbit (NGSO) communication constellation systems.The potential interference scenarios under multiple NGSO communication constellation systems sharing the same spectrum band was comprehensively analyzed, with the aid of analyzing frequency plan of typical constellation systems.Then the possibility of interference risk in each scenario was qualitatively evaluated.According to the characteristics of interference scenarios, the key parameters and models for the co-frequency interference analysis between the NGSO communication constellation systems were discussed, and the computing models of co-frequency interference based on three diff erent protect criterion were presented.Finally, challenges and key research directions of co-frequency interference analysis between NGSO communication constellation systems were pointed out.The research can provide a reference for the study of compatibility and coexistence between broadband Internet constellation systems.

Interference Avoidance and Mitigation Techniques for Hybrid Satellite-Terrestrial Mobile Backhaul System

Xiaoyan ZHANG, He WANG

2021, 2(1):  28-34.  doi:10.11959/j.issn.2096-8930.2021004

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One of the best ways is to assume that satellite and terrestrial segments share the same spectrum in order to utilize more eff ciently the scarce and expensive spectrum resource.The interference avoidance and mitigation technologies such as antenna arrays, multi-antenna communication technologies, intelligent backhaul nodes, interference-aware power allocation method, and licensed shared access (LSA) were deployed in a hybrid satellite-terrestrial mobile backhaul (MBH) system to demonstrated how to enhance the overall capacity of the hybrid system and reuse the spectrum at diff erent systems on a noninterfering basis.Through theoretical analysis and numerical simulations, it is observed that these interference avoidance and mitigation techniques mentioned above could be used eff ciently to meet the enormous capacity demands of future backhaul networks, off -load the terrestrial segment, manage intrasystem (terrestrial) and the intersystem (satellite-terrestrial) co-channel interference (CCI), lead to hardware costs and energy-consumption savings, and improve spectrum utilization eff ciency.

Analysis of Technical and Operational Requirements for Earth Stations in Motion in Ka-band

Ruiqing WEN, Jin JIN, Zhen HUANG

2021, 2(1):  35-45.  doi:10.11959/j.issn.2096-8930.2021005

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Current technical and operational requirements for FSS GSO ESIM in Ka-band was in-depth researched.Referring to Radio Regulations and ITU recommendations, a model for theoretical calculation was established and restraining logic between each requirement and theory of depressing interference to adjacent satellites was analyzed.Then working conditions of NGSO ESIM in Ka-band was analyzed using the similar methods and the diff erences between GSO ESIM and NGSO ESIM and the infl uences on requirements of NGSO ESIM was illustrated.The results of this article provided some references for setting technical and operational requirements of NGSO ESIM.

From Frequency Spectrum Occupation to Effi ciently Utilization

Hui LI

2021, 2(1):  46-51.  doi:10.11959/j.issn.2096-8930.2021006

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The situation and causes of satellite frequency occupation in the current satellite network fi ling publication, coordination and operation was analyzed.Through the specifi c research on several typical topics in the current satellite frequency coordination compatibility analysis, specifi c measures were proposed to improve the eff ective utilization of satellite frequency orbit resources, so as to provide the eff ective sharing of satellite radio frequency technical methods.

Frequency Interference Analysis and Calculation of Geostationary-Orbit Satellite Network

Chang LIU, Wenkang WEI, Wei LI

2021, 2(1):  52-59.  doi:10.11959/j.issn.2096-8930.2021007

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The status of the submission and coordination of the global geostationary-orbit (GSO) satellite networks, GSO satellites in orbit were reviewed.The international rules of interference analysis and calculation between GSO satellite networks, two calculation methods of judging whether the coordination was needed coordination arc and ΔT/T, the calculation method of C/I and the access of the input parameters under diff erent scenarios were studied.The softwares of Visualyse GSO and ITU GIBC were introduced.The interference using the Visualyse GSO software between GSO satellite networks with different orbital separations was analyzed.It provides a reference for satellite operators to analyze and calculate the interference between GSO satellite networks and ensure the practical availability of satellite frequencies.

Analysis of the Starlink Satellite Network Filing Application

Wenhan YANG, Guoliang HUA, Yan FENG, Yuanfu LI, Ranran HOU

2021, 2(1):  60-68.  doi:10.11959/j.issn.2096-8930.2021008

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The frequency and orbit requirements of Starlink were investigated and compared with the satellite network fi llings from SpaceX.And then the priority of SpaceX in the global frequency orbit resource competition was analyzed.Then, through interpreting the terms of the Radio Regulations that cited by SpaceX, the strategies, techniques and possible actions of SpaceX in application and modifi cation for satellite network fi llings were studied.The analysis results of this paper can provide reference for the network resources application and modifi cation work of low-orbit satellite Internet constellation in China.

Study

Modeling and Simulation of Satellite Communication System Base on MBSE

Wenping LI, Hefeng BAI, Yi ZHAO, Leilei WU, Xiaoting WANG

2021, 2(1):  69-74.  doi:10.11959/j.issn.2096-8930.2021009

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A method based on model-based systems engineering (MBSE) for the demonstration, top-level design and engineering construction of the satellite communication system was introduced, which was aim at the problem of design, description, verification and validation in the construction and application of complex satellite communication system.According to the system design standard base on department of defense architecture framework (DoDAF), the system views (SV) such as function model, node model and process model were built by using the system architecture (SA) design software.Through the digital simulation based on model driven and the analysis of simulation data, the correctness, rationality and feasibility of the system design were verifi ed.The results showed that this method can eff ectively identify risks in the system design stage, verify and confi rm the design scheme, and provide strong support for project demonstration, top-level design and engineering construction of satellite communication system.

Applications

The Requirements Analysis of Satellite Application in Marine Transportation Industry

Zhen LI, Yumin ZHAO, Guangyue XUE, Yunfei AI, Falong LIU

2021, 2(1):  75-80.  doi:10.11959/j.issn.2096-8930.2021010

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With the rapid development of modern technologies and satellite communication, the need to apply satellite communication in the transport field in China has become stronger and stronger.The development and application status of the major satellite communication systems in China and abroad was introduced, and nine major application services of traff c navigation monitor at sea, emergency communications, broadband access of ship etc were studied, and the application of maritime satellite communications and the development tendency were explored, took into account the status and existing problems of maritime satellite communications in China.Based on the above, recommendations on the construction of an independent and controllable space-terrestrial integrated satellite communication network in China for maritime applications were provided.

Key Issues in Development and Application of the Sky-Based Internet of Things

Yongjian LIU, Bincheng LI, Yanzhe WANG

2021, 2(1):  81-86.  doi:10.11959/j.issn.2096-8930.2021011

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The advantage and technical characteristics of the space-based internet of things(IoT) was analyzed and present status of existing space-based IoT system was brief description.The present situation of satellite communications industry was studied, combined with the development of other industries, suitability of space-based IoT, and users demand growth, in a macro position with current situation and perspective of industry market and development trend of space-based IoT was discussed, and the market space was predicted.The key technology of space-based IoT was analyzed, technical requirements and challenges were discussed according to access technology, networking, application layer.The perspective of development of space-based IoT in technical and market prospect was analyzed, the critical issues and key elements in the development and application of space-based IoT need to focus on were put forward, and made recommendations for the development of space-based IoT.

Research on Cloud-Side Collaborative Meteorological Information Processing and Intelligent Services

Hongping SHU, Wang TANG, Fei LUO, Zhuoning ZHAO, Yaqiang WANG

2021, 2(1):  87-92.  doi:10.11959/j.issn.2096-8930.2021012

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China has set up the largest and most comprehensive ＆quot;land-air-space＆quot; integrated automatic meteorological observation network and integrated meteorological observation system in the world.Meteorological informatization has put forward new demands for digital transformation.From the perspective of cloud edges synergy distributed technology, according to the technical characteristics of cloud, edge and side collaborative distributed technique of meteorological information processing, according to the real business situation of the China meteorological administration, the implementation possibility of the cloud, edge and side collaborative technique in meteorological information processing and service were analyzed, and a model driven cloud, edge and side collaborative system architecture and service architecture for the meteorological information processing was proposed.

Application Prospect of Space-Integrated-Ground Information Network in Railway

Kaifeng WANG, Xiangbao KAI, Ming LI, Yuan GAO, Yun LIU, Jinchuan CHAI

2021, 2(1):  93-98.  doi:10.11959/j.issn.2096-8930.2021013

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With the advantages of wide coverage, no geographical restrictions and convenient establishment, the spaceintegrated-ground information network can integrate with the existing railway communication network and expand the railway communication service capacity and service scope.Based on the analysis of the application status of railway communication system in China, the application requirements of the space-integrated-ground information network from the aspects of railway business, technical development and intelligent railway construction were discussed.The overall application framework of the space-integrated-ground information network was put forward, the access mode and application mode of the network and satellite terminals were designed, and the typical application requirements in railway survey and construction, emergency rescue, railway operation and security were analyzed.