长基线天线组阵及其在深空遥测中的应用  

Long baseline antenna arraying and its applications to telemetry in deep space explorations

作　　者：舒逢春[1] 江悟[1] 张秀忠[1] 

机构地区：[1]中国科学院上海天文台,上海200030

出　　处：《电波科学学报》2012年第5期985-989,1018,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(10973033)

摘　　要：天线组阵技术可以提高接收深空探测器微弱信号的链路余量。文中针对具有较低码速率的遥测信号进行了长基线信号合成实验,结合遥测信号基带信号处理软件平台对实验结果进行分析。同时研究了全频谱合成、基带合成和符号流合成三种基本信号合成技术的信号处理和技术要求;并利用我国甚长基线干涉测量网(CVN)接收和处理嫦娥二号卫星的遥测信号,探讨了这三种天线组阵信号合成技术的性能。结果表明:如果消除1比特量化的影响,由符号信噪比估计得到的信号合成效率均可在90%以上。这充分验证了长基线天线组阵技术的可行性,也为将来更远距离的深空通信提供了一种有效的途径。The antenna arraying technique can be used to receive weak signals of deep space probes and improve the link budget. In the paper,a signal combining experiment of long baseline antenna arraying is carried out to receive the telemetry signal of relative low code rate. Combined with a telemetric software baseband receiver,the antenna arraying processing platform is conducted to deal with the signals and analyze the results. Meanwhile, three basic signal combining techniques called full spectrum combining, baseband combining and symbol stream combining are investigated in details. The field data collected by Chinese VLBI network for the Chang＇E 2 satellite is processed and analyzed to evaluate the performances of three signal combining techniques. The results indicate that the efficiency calculated by the symbol signal-to-noise ratio exceeds 90% if ignoring the degradation of 1-bit quantification. The applicability of the long baseline antenna arraying is sufficiently confirmed. It provides an effective approach of deep space communications for the future missions.

关 键 词：天线组阵 遥测 相关 信号合成 

分 类 号：TN850.9[电子电信—信息与通信工程] P164[天文地球—天文学]