射电天文任务的软件关联函数
Software correlator for Radioastron mission
摘要：
本文介绍了射电天文项目中天地干涉仪的重要组成部分--天文空间中心软件FX关联函数的特点和使用方法。该项目利用10米空间射电望远镜与地面射电望远镜在92、18、6和1.3厘米波长上对紧凑型射电源进行联合观测。本文介绍了利用ASC关联函数进行射电天文项目天地VLBI数据处理的主要特点。实施的条纹搜索程序的质量提供了积极的结果，而没有相关幅度的显著损失。ASC关联函数具有接近实时操作的计算能力。关联函数有多种处理模式：“连续”、“谱线“、“脉冲星”、“巨脉冲”、“相干”。特别注意射电天文空间-地面VLBI数据处理的特点。文中还讨论了空-地干涉仪数据相关中的时延和时延率的计算方法。在Radioastron空间射电望远镜（SRT）成功运行的5年中，ASC关联函数显示出满足当前和未来地面和空间VLBI科学稳定增长的需求的巨大潜力。展示了ASC软件关联函数的运行结果。
英文摘要：
In this paper we discuss the characteristics and operation of Astro Space Center (ASC) software FX correlator that is an important component of space-ground interferometer for Radioastron project. This project performs joint observations of compact radio sources using 10 meter space radio telescope (SRT) together with ground radio telescopes at 92, 18, 6 and 1.3 cm wavelengths. In this paper we describe the main features of space-ground VLBI data processing of Radioastron project using ASC correlator. Quality of implemented fringe search procedure provides positive results without significant losses in correlated amplitude. ASC Correlator has a computational power close to real time operation. The correlator has a number of processing modes: "Continuum", "Spectral Line", "Pulsars", "Giant Pulses","Coherent". Special attention is paid to peculiarities of Radioastron space-ground VLBI data processing. The algorithms of time delay and delay rate calculation are also discussed, which is a matter of principle for data correlation of space-ground interferometers. During 5 years of Radioastron space radio telescope (SRT) successful operation, ASC correlator showed high potential of satisfying steady growing needs of current and future ground and space VLBI science. Results of ASC software correlator operation are demonstrated.
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