VGOS基带数据预处理系统研究  

Research of VGOS baseband data pre-processing system

作　　者：甘江英[1,3] 郭绍光 何旋[1] 柳聪 孙正雄 李纪云[1,2] 马浪明[4] 舒逢春[1] 张秀忠 GAN Jiangying;GUO Shaoguang;HE Xuan;LIU Cong;SUN Zhengxiong;LI Jiyun;MA Langming;SHU Fengchun;ZHANG Xiuzhong(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Shanghai Key Laboratory of Space Navigation and Positioning Techniques,Shanghai 200030,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Time Service Center,Chinese Academy of Sciences,Xi′an 710600,China)

机构地区：[1]中国科学院上海天文台,上海200030 [2]上海市空间导航与定位技术重点实验室,上海200030 [3]中国科学院大学,北京100049 [4]中国科学院国家授时中心,西安710600

出　　处：《中国空间科学技术》2022年第6期46-53,共8页Chinese Space Science and Technology

基　　金：SKA专项基金(2020SKA0110300);国家自然科学基金(11873079,11911540462,11961141001);国家自然科学基金委员会-中国科学院天文联合基金(U1831204);中国科学院青年创新促进会基金(2021258);上海市空间导航与定位技术重点实验室基金(201904)。

摘　　要：VLBI全球观测系统-VGOS的数据采集系统具有超宽的记录带宽和超高的数据速率,数据率稳定可达16 Gbit/s。数据回放及解析等预处理工作是数据采集到相关处理的关键步骤。针对国内VGOS数据采集系统,研发了VGOS基带数据预处理系统,分析了高速记录的元数据及基带数据格式,设计实现了数据记录、聚合、解析、重组等预处理模块。通过对预处理系统的研究和测试,分析了其效率提升的方法。利用预处理系统成功对国际VGOS站观测数据进行回放和解析,经过数据的相关处理成功获得了干涉条纹。表明预处理系统可正确处理高速数据,预处理过程中数据聚合速率平均可达到10 Gbit/s,解析效率可达3.6 Gbit/s,满足当前VGOS观测数据的超宽带、超高速处理要求。The data acquisition system of very long baseline interferometry global observation system(VGOS)has ultra-broad recording bandwidth and ultra-high data rate.The data rate is stable up to 16 Gbit/s.Pre-processing such as data playback and analysis is the key step from data acquisition to data correlation.For the domestic VGOS acquisition system,a VGOS baseband data pre-processing system was developed;the metadata and baseband data format of high-speed recorded data were analyzed;the pre-processing modules such as data recording,gathering,de-thread and re-channel were designed and implemented.Through the research and test of the preprocessing system,the methods to improve its efficiency were analyzed.Moreover,the preprocessing system was successfully used to replay and analyze the observation data of international VGOS station,and the interference fringes were successfully obtained through data correlation processing.All of these show that the data pre-processing system can correctly process high-speed data.The average data gathering rate can reach up to 10 Gbit/s and the de-thread efficiency can reach to 3.6 Gbit/s,which achieves the current goals of ultra-wideband and ultra-high speed processing of VGOS observation’s baseband data.

关 键 词：VLBI全球观测系统 甚长基线干涉测量技术 基带数据 数据预处理 相关处理 

分 类 号：P164[天文地球—天文学] P129