Abstract
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.
Highlights
Airborne radar has a high data rate that can reach hundreds of Mbps or even Gbps in many applications [1,2,3,4], which is much higher than the current air-to-ground data transfer rate, so an onboard data storage system is often required by the airborne radar [5,6]
The file management method is studied for the data storage of the airborne radar in this paper
The updating frequency of the file allocation table (FAT) and file directory table (FDT) is very high, which results in frequent address jumps during data storage
Summary
Airborne radar has a high data rate that can reach hundreds of Mbps or even Gbps in many applications [1,2,3,4], which is much higher than the current air-to-ground data transfer rate, so an onboard data storage system is often required by the airborne radar [5,6]. Because the FTLs of NAND flash products are not visible to the processor, the studies of optimizing the file management are extensively carried out by scholars of all over the world to solve the two main problems in the onboard data storage system [22,23,24,25]. This method greatly reduces the updating frequency of the FAT and the FDT during the data storage of this file It is not suitable for the case where the size of free storage space is much larger than that of a certain file, for example 32 times the file’s size, because the contents of the FAT will be frequently preallocated and released in this case.
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