| 基于FPGA的CCSDS星载数据无损压缩系统设计 |
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| 引用本文： | 孙建伟,张忠伟,郑铁,薛长斌,陈聪.基于FPGA的CCSDS星载数据无损压缩系统设计[J].空间科学学报,2019,39(5):694-700. |
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| 作者姓名： | 孙建伟 张忠伟 郑铁 薛长斌 陈聪 |
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| 作者单位： | 中国科学院国家空间科学中心 北京100190;中国科学院大学 北京100049;中国科学院国家空间科学中心 北京100190 |
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| 基金项目： | 中国科学院空间科学战略性先导科技专项Ⅱ期项目资助（XDA15020101） |
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| 摘 要： | 星载数据的无损压缩对星载数据的存储和传输具有重要意义.CCSDS推荐的RICE算法对于实现数据的无损压缩具有很好的效果.本文针对RICE算法中k值选择算法计算量大的缺点，利用预处理样本最大值优化k值的方法，使优化后的算法计算复杂度更低，资源占用率更小，运行时间更短，但压缩比相近.利用FPGA进行硬件实现并通过仿真和试验测试，使星载数据的压缩比达到1.5以上，可以满足星载系统对数据压缩的要求，为星上其他载荷提供更多资源.
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| 关 键 词： | RICE FPGA 星载数据 无损压缩 |
| 收稿时间： | 2018-07-18 |
Design of Lossless Compression System for CCSDS On-board Data Based on FPGA |
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| Institution: | 1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190;2. University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | The growth volume of on-board data such as imagery, spectrum or radar data challenges the storage and transmission tasks on orbits. Hence, a universal lossless data compression algorithm is necessary. The lossless compression algorithm which is based on RICE code and recommended by CCSDS has an efficient performance for on-board data. However, the selection of parameter k consumes much time in this algorithm. In this paper, the method which uses maximum value of samples to optimize the parameter k can be adopted to reduce the complexity and the hardware resource. The proposed algorithm has the same compression ration but shorter run-time comparing with the traditional one. Finally, the proposed algorithm has been implemented by FPGA. The results of the simulation and experiment illustrate that the compression ratio of on-board data can reach 1.5 or more. It can fulfill the requirement of data compression for space borne system and spare more resources for the other payloads on the satellite. |
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