【作者】 何善宝； 林益明； 吴乐南； 冯熳； 王平； 陈忠贵； 谢军；

【Author】 He Shanbao1,Lin Yiming1,Wu Lenan2,Feng Man2,Wang Ping1,Chen Zhonggui1,Xie Jun1 1.Beijing Institute of Spacecraft System Engineering,CAST,Beijing 100094,China 2.School.Of Information Science & Engineering,Southeast University,Nanjing 210096,China

【机构】 中国空间技术研究院总体部； 东南大学信息科学与工程学院；

【摘要】 星间链路的一个重要特点就是其收发设备均安装在卫星上,因此星间链路发射装置和接收装置均有较严格的重量和功耗的约束。如果采用传统的PSK调制,难以降低发射功率,无法满足未来的星间链路设备进一步小型化需求。BPSK调制理论上频带利用率只有1bps/Hz,而星间链路采用超窄带调制频带利用率可以提高到50bps/Hz以上,且单位带宽内不用明显增加功率。为从通信链路的底层应对功率和带宽同时受限的挑战,本文从信息理论基础和通信技术源头开展创新:将高频谱效率的EBPSK调制波形、极大提升解调前信噪比的数字冲击滤波器、自适应锁相解调方法和进一步提升解调性能的波形参数匹配技术有机融为一种全新而独特的高效通用调制解调体制,并结合导航星座星间链路的要求进行仿真分析,表明其bps/Hz/SNR综合指标显著超过现有对比技术,且码率、带宽和信噪比可与空间环境自适应。更多还原

【Abstract】 The power and weight of ISLs transponders will be limited,because they are fixed in satellites.It is difficult to satisfy satellite miniaturization and reduce transmitting power that traditional phase shift key(PSK) modulation be adopted in inter-satellite links.In theory, band-efficiency of BPSK modulation is only 1bps/Hz.If information needed to be transmitted between satellites is modulated by a UNB method,band-efficiency will become 50bps/Hz and transmitting power in uniform band will not increase obviously.In order to face the dilemma of both band-width and power limited from the spring of communications system,this paper introduce a novel,special and high efficient modulation system which can combine harmoniously EBPSK(Extended BPSK) modulation,digital impulsion filter,adaptive demodulation method and parameter-matching technology.The signal system of GNSS ISLs with novel modulation and demodulation will be simulated and analyzed.The results show that the integrated index(bps/Hz/SNR) of new signal system outperforms other present systems. And many important parameters,such as rate,band-width and SNR,may change with space environment for new signal system更多还原