中文摘要：

中国VLBI网（CVN）软件相关处理机包括数据预处理、条纹搜索及模型重构、软件相关处理和相位校正信号提取四个模块。提出了一种新的数据预处理方法，可对CVN各观测站生成的Mark5B格式的数据进行网络接收、同步字搜索、时间解码、数据码速率识别、数据纠错、数据有效率统计、测站数据延迟仿真与文件存储等预处理操作。经预处理后的数据可供软件相关处理、相位校正信号提取以及条纹搜索及模型重构等模块或VLBI中心其他软件使用。高性能VLBI数据预处理方法及其技术实现是VLBI软件相关处理机系统正常运行的重要保障。

英文摘要：

The software correlator system of Chinese VLBI network （CVN） consists of data preprocessor, fringe search/model reconstruction, software correlation and phase calibration（PCAL） signal extraction modules. A new data preprocessing method is presented, which can carry out network receiving of Mark5B data from each CVN station, synchronization word searching, time decoding, data rate identifying, data error correcting, data efficiency counting, data delay simulation, file storage etc. The preprocessed data can be used by software correlation, PCAL signal extraction, fringe search/model reconstruction or other softwares of VLBI center. Such high-performance VLBI data preprocessing method and its technical implementation are important to the routine operation of the VLBI software correlator system.