In order to solve the problem that the air-to-ground data transfer rate is much lower than the radar data rate, the onboard system is commonly used for storing the airborne radar data. However, there are two main problems in the data storage using the traditional file management method. The first is that the frequent data updating of the file allocation table (FAT) and the file directory table (FDT) cause a high frequency of address jumps among the discontinuous areas, which leads to a long response time. The second is that the updating frequencies of the FAT, the FDT and the data region are seriously inconsistent, which results in uneven wear of the three areas. To solve these two problems, a file management method, which optimizes the data writing in the three areas of the FAT, the FDT and the data region, is proposed in this study. An actual measurement is carried out on a data storage system of the airborne radar using the proposed file management method. The result shows that the proposed method significantly reduces the updating frequency of FAT and FDT, and achieves the wear levelling of file area and data region.

为了解决空地数据传输速率远低于雷达数据速率的问题，通常采用机载系统来存储机载雷达数据。然而，采用传统的文件管理方式进行数据存储主要存在两个问题。首先是文件分配表（FAT）和文件目录表（FDT）的频繁数据更新导致不连续区域之间的地址跳转频率较高，从而导致响应时间较长。二是FAT、FDT和数据区域的更新频率严重不一致，导致三个区域磨损不均匀。为了解决这两个问题，本研究提出了一种文件管理方法，该方法优化了FAT、FDT和数据区域三个区域的数据写入。采用所提出的文件管理方法对机载雷达数据存储系统进行了实际测量。结果表明，该方法显着降低了FAT和FDT的更新频率，实现了文件区和数据区的磨损均衡。