| 摘要: |
| 针对低轨卫星透明转发通信系统，提出了一种动态链路预算评估模型，为透明转发卫星互联网设计提供参考。该模型给出了星地透明转发两跳链路信噪比（Signal-to-Noise Ratio，SNR）计算方法，在计算信号传播链路中自由空间路径损耗、阴影衰落、大气吸收、云雾衰减和降雨衰减的基础上，分析了我国大陆地区在全球典型低轨卫星星座覆盖下的两跳链路SNR，以及不同位置用户解调所需的信关站等效全向辐射功率要求。仿真结果表明，该方法考虑了馈电链路和用户链路的共同作用，能较好地评估卫星星座设计、用户地理位置对两跳链路SNR的影响。 |
| 关键词: 低轨卫星 链路预算 透明转发 链路衰减 |
| DOI： |
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| 基金项目:福建省自然科学基金项目（2020J01039）；漳州市科技计划项目（ZZ2020J04） |
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| A dynamic link budget evaluation model for low Earth orbit satellite |
| ZHANG Chaoxian,ZHANG Yi,XU Fan |
| (School of Information Science and Technology,Xiamen University Tan Kah Kee College,Zhangzhou 363105,China;Southwest China Institute of Electronic Technology,Chengdu 610036,China;College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China) |
| Abstract: |
| A dynamic link budget evaluation model is proposed to provide design reference for transparent forwarding satellite communication network.The proposed model presents a two-hop link signal-to-noise ratio(SNR) calculation method,considering the effects of free space path loss,shadow fading,atmospheric absorption,cloud and rainfall attenuation.The two-hop SNR as well as the demodulation equivalent isotropically radiated power(EIRP) requirements are analyzed according to typical global low Earth orbit(LEO) satellite constellations with different geographic users located in Chinas mainland.The simulation results show that,for considering the joint effect of feeder link and user link,the proposed method can evaluate the effects of satellite constellation design and user geographical location on two-hop link SNR reasonably. |
| Key words: low Earth orbit(LEO) satellite link budget transparent forwarding link attenuation |
《电讯技术》编辑部 