VGOS基带数据预处理系统研究

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16Gbit/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10Gbit/s，解析效率可达3.6Gbit/s，满足当前VGOS观测数据的超宽带、超高速处理要求。

Research of VGOS baseband data pre-processing system

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 16Gbit/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 10Gbit/s and the de-thread efficiency can reach to 3.6Gbit/s,which achieves the current goals of ultra wideband and ultra-high speed processing of VGOS observation’s baseband data.