高精度甚长基线干涉测量理论时延软件的实现

发布时间：2018-01-17 01:04

本文关键词：高精度甚长基线干涉测量理论时延软件的实现　出处：《测绘科学》2017年02期 　论文类型：期刊论文

【摘要】：针对甚长基线干涉测量天文观测、深空探测和空间阵列项目对高精度理论时延计算的需求,该文进行了高精度理论时延计算软件的具体实现。首先介绍了河外射电源和探测器理论时延计算模型;然后详细阐述了理论时延计算软件的系统架构及其具体实现;最后将该软件与DiFX软件和嫦娥工程甚长基线干涉测量软件的计算结果进行对比分析。比对结果显示:对于河外射电源,理论时延差最大为几百个皮秒;对于探测器,理论时延差小于2ns,这表明该软件能够用于地面验证试验。
[Abstract]:For astronomical observation of very long baseline interferometry, deep space exploration and space array project, high precision theoretical time delay calculation is required. In this paper, the high-precision theoretical time-delay calculation software is implemented. Firstly, the theoretical time-delay calculation model of extragalactic radio source and detector is introduced. Then, the system architecture and its implementation of theoretical time-delay computing software are described in detail. Finally, the calculation results of the software are compared with the DiFX software and the Chang'e project very long baseline interferometry software. The results show that the maximum theoretical delay difference is several hundred picoseconds for the extragalactic radio power supply. For the detector, the theoretical delay difference is less than 2ns, which shows that the software can be used in the ground verification test.
【作者单位】：信息工程大学;中国科学院上海天文台;
【基金】：国家自然科学基金天文联合基金项目(U1231116) 中国科学院青年创新促进会项目(U1331205)
【分类号】：P228.6
【正文快照】： 0引言甚长基线干涉测量(very long baseline inter-ferometry,VLBI)是20世纪60年代后期发展起来的天文观测技术,由于其具有超高的角分辨率和测量精度,在天体物理、天体测量、大地测量和深空探测等方面都得到了广泛应用[1-2]。VLBI的角分辨率θ为观测波长λ与基线长度D之比。VL

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