基于多重网格的射电源条纹搜索算法研究

Research on Radio Source Fringe Search Algorithm Based on Multi-Grid

空间甚长基线干涉测量(Very Long Baseline Infertaro-meter,VLBI)是射电天文未来重要的发展方向,但其观测系统和轨道等不稳定因素会导致相关处理机所需的预报时延模型与实际时延相差较大,在这种情况下很难获得干涉条纹。提出了基于多重网格的射电源条纹搜索算法,可以在不使用时延模型的情况下,使相关处理机在较大范围内从原始数据中自动完成干涉条纹搜索,利用滑动窗口技术扩大搜索范围,多重网格技术提高搜索效率。实测数据表明,该算法能够在不依赖先验预报时延模型的情况下成功获得射电源干涉条纹。

Space VLBI is an important development direction in the future,but its observation system and orbital instability will cause the forecast delay model to differ greatly from the actual delay.In such case,it is difficult to obtain interference fringes.This paper proposes a radio grid fringe search algorithm based on multiple grids,which can search interference fringes from the original data over a wide range without using a delay model.Use sliding window technology to increase search range,and multi-grid technology to improve search efficiency.The observation data experiment results show that the algorithm successfully obtains the interference fringes of VLBI radio source without forecasting delay model.