中文摘要：

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MARK5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。

英文摘要：

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.