VLBI软件相关处理机系统中的数据预处理方法  

DATA PREPROCESSING METHOD IN VLBI SOFTWARE CORRELATOR SYSTEM

作　　者：张冬[1,2] 郑为民[1] 

机构地区：[1]中国科学院上海天文台 [2]中国科学院研究生院,北京100049

出　　处：《中国科学院上海天文台年刊》2007年第1期185-192,共8页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

基　　金：国家自然科学基金(No.10403009);月球探测工程项目资助课题

摘　　要：在绕月探测工程VLBI数据处理中心的软件相关处理机系统中,各VLBI观测站采集的原始数据必须经过预处理才能进行相关处理与条纹搜索等运算。处理机预处理模块对来自各个观测站的MARK 5观测数据进行模式判别、寻找同步头、计算CRC校验码、时间同步等操作,生成时间长度为1min的标准Linux文件,并存放于硬盘阵列上,供相关处理和条纹搜索使用。预处理模块和软件相关处理模块、条纹搜索模块协调配合,保证了软件相关处理机系统在准实时和事后两种观测模式下的性能指标。In the VLBI software correlator system of the Chinese lunar exploration project, the original data from the VLBI stations must be preprocessed before correlation. For this reason, a data preprocessing program was developed. This module first received the data from the MARK 5 terminals at the observatories, and finished the functions of data decoding, error correcting, data dividing, then changed them into a batch of standard Linux files of one minute length and saved them on the disk array for software correlation and fringe searching finally. Cooperating with this preprocessing module, the software correlator system was able to meet the requirements of the real time and the post working modes.

关 键 词：甚长基线干涉测量技术(VLBI) 软件相关处理机 预处理 时间同步 MARK 5 

分 类 号：P228.6[天文地球—大地测量学与测量工程] TP274[天文地球—测绘科学与技术]