太阳闪烁下深空信道建模与电波传播特性分析  

Deep space channel modeling and the analysis of wave propagation environment characteristics under solar scintillation

作　　者：吴桐[1,2,3] 闫毅[1,2] 李永成 王春梅[2] 姚秀娟[2] 李雪[2] 

机构地区：[1]电子信息系统复杂电磁环境效应国家重点实验室,河南洛阳471003 [2]中国科学院空间科学与应用研究中心,北京100190 [3]中国科学院大学,北京100049

出　　处：《电波科学学报》2015年第3期417-422,共6页Chinese Journal of Radio Science

基　　金：CEMEE国家实验室开放课题基金项目(CEMEE2014K0105B)

摘　　要：当深空通信路径距太阳较近时,受太阳闪烁等电磁活动的影响,无线电波会受到严重干扰,导致传输误码率增高甚至通信中断.为了保持飞行器与地面或飞行器之间的正常通信,对深空信道传输特性进行研究.包括信号的幅度统计特性、信道的相干时间和相干带宽、太阳闪烁相对于地面多径及电离层闪烁的主要区别等,并建立了太阳闪烁下的深空信道模型,提出了一种选择进入非频率选择性慢衰落信道时间最久的信号带宽选择方法.仿真结果表明:在不同日张角特别是较小日张角下,使用该方法选出的信号带宽比使用其他信号带宽拥有更低的误码率.Abstract For deep space communication paths close to the sun causing solar scintillation of radio waves and increasing bit error rate(BER),the approach of choosing the signal bandwidth in the non-frequency selective and slow fading channel with maximum time was proposed.The deep space communication channel model was built based on Rician fading channel model.The statistical characteristics of the amplitude,the coherence time and the coherence bandwidth of the channel were used.The difference among solar scintillation,mobile multipath and ionosphere scintillation was compared.Based on the change of the coherence time and coherence bandwidth with solar elongation angle,the time-selective and frequency-selective characters were determined.Simulation results show that at different little solar elongation angle,especially the small one,the BER of the signal bandwidth chosen by the proposed approach is better than the BER of other signal bandwidth.

关 键 词：相干带宽 相干时间 衰落信道 信号带宽 太阳闪烁 

分 类 号：TN929.13[电子电信—通信与信息系统]