低轨遥感卫星Ka频段 自适应编码调制应用效能分析  

Analysis on Application Efficiency of Adaptive Coding and Modulation for LEO Remote Sensing Satellite at Ka-band

作　　者：王中果 汪大宝 胡月 鲁帆[3] WANG Zhongguo;WANG Dabao;HU Yue;LU Fan(Institute of Remote Sensing Satellite,China Academy of Space Technology,Beijing 100094,China;Space Star Technology Co.,Ltd.,Beijing 100095,China;Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]中国空间技术研究院遥感卫星总体部,北京100094 [2]航天恒星科技有限公司,北京100095 [3]北京空间飞行器总体设计部,北京100094

出　　处：《航天器工程》2021年第4期69-76,共8页Spacecraft Engineering

基　　金：国家重大航天工程。

摘　　要：分辨率的不断提高对低轨遥感卫星对地数据传输能力提升提出了迫切需求。当前低轨遥感卫星对地数据传输采用固定编码调制(CCM)和可变编码调制(VCM),未利用仰角增大时大气损耗减小带来的信道条件改善,对链路资源造成较大浪费。自适应编码调制(ACM)在VCM基础上,充分利用大气损耗的时变特性,可进一步提高链路的数据吞吐能力。为综合衡量数据传输性能,文章提出低轨遥感卫星传输效能因子指标,并对Ka频段降雨特性不同的喀什、北京、三亚地面站CCM,ACM,VCM的传输效能进行了对比分析。仿真结果表明:按链路可用度最大的原则设计时,ACM的传输能力明显优于VCM和CCM,显著提高了数传系统的综合传输效能。The increasing resolution of LEO(low earth orbit)remote sensing satellite puts forward an urgent demand for improving the ability of satellite-to-earth data transmission.The data transmission from current LEO remote sensing satellite to earth adapts CCM(constant coding and modulation)and VCM(variable coding and modulation),and they do not take advantage of the improvement of channel conditions caused by the decrease of atmospheric loss when the elevation angle increases,resulting in a great waste of link resource.On the basis of VCM,ACM(adaptive coding and modulation)can make full use of the time-varying characteristics of atmospheric to further improve the data throughput of the link.To evaluate the data transmission performance synthetically,the figure of transmission effectiveness factor is proposed,and the transmission performances of CCM,ACM and VCM in Kashi,Beijing and Sanya ground stations with different rainfall characteristics at Ka-band are analyzed and compared.The simulation results show that the transmission capacity of ACM system is better than that of VCM and CCM system obviously according to the principle of maximum link availability,and the comprehensive transmission effectiveness of data transmission system is significantly improved.

关 键 词：低轨遥感卫星 固定编码调制 可变编码调制 自适应编码调制 应用效能 KA频段 

分 类 号：TN927[电子电信—通信与信息系统]