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

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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select 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 Space-Integrated-Ground Information Networks    2021, 2 (1): 11-19.   DOI: 10.11959/j.issn.2096-8930.2021002 Abstract （282）   HTML （20）    PDF（pc） （2504KB）（144）       Knowledge map    Save 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. Table and Figures | Reference | Related Articles | Metrics Select Research on Scenarios and Modeling of Co-Frequency Interference Between NGSO Communication Constellation Systems Wei LI, Kang YAN, Jingru GENG, Wen WANG Space-Integrated-Ground Information Networks    2021, 2 (1): 20-27.   DOI: 10.11959/j.issn.2096-8930.2021003 Abstract （487）   HTML （54）    PDF（pc） （1215KB）（528）       Knowledge map    Save 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. Table and Figures | Reference | Related Articles | Metrics Select Interference Avoidance and Mitigation Techniques for Hybrid Satellite-Terrestrial Mobile Backhaul System Xiaoyan ZHANG, He WANG Space-Integrated-Ground Information Networks    2021, 2 (1): 28-34.   DOI: 10.11959/j.issn.2096-8930.2021004 Abstract （156）   HTML （20）    PDF（pc） （1309KB）（205）       Knowledge map    Save 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. Table and Figures | Reference | Related Articles | Metrics Select Analysis of Technical and Operational Requirements for Earth Stations in Motion in Ka-band Ruiqing WEN, Jin JIN, Zhen HUANG Space-Integrated-Ground Information Networks    2021, 2 (1): 35-45.   DOI: 10.11959/j.issn.2096-8930.2021005 Abstract （237）   HTML （19）    PDF（pc） （1503KB）（491）       Knowledge map    Save 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. Table and Figures | Reference | Related Articles | Metrics Select From Frequency Spectrum Occupation to Effi ciently Utilization Hui LI Space-Integrated-Ground Information Networks    2021, 2 (1): 46-51.   DOI: 10.11959/j.issn.2096-8930.2021006 Abstract （168）   HTML （21）    PDF（pc） （877KB）（141）       Knowledge map    Save 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. Table and Figures | Reference | Related Articles | Metrics Select Frequency Interference Analysis and Calculation of Geostationary-Orbit Satellite Network Chang LIU, Wenkang WEI, Wei LI Space-Integrated-Ground Information Networks    2021, 2 (1): 52-59.   DOI: 10.11959/j.issn.2096-8930.2021007 Abstract （311）   HTML （21）    PDF（pc） （3228KB）（342）       Knowledge map    Save 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. Table and Figures | Reference | Related Articles | Metrics Select Analysis of the Starlink Satellite Network Filing Application Wenhan YANG, Guoliang HUA, Yan FENG, Yuanfu LI, Ranran HOU Space-Integrated-Ground Information Networks    2021, 2 (1): 60-68.   DOI: 10.11959/j.issn.2096-8930.2021008 Abstract （2132）   HTML （439）    PDF（pc） （1185KB）（1730）       Knowledge map    Save 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. 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