基于DCT-TCQ的SAR原始数据压缩算法

宋鸿梅; 王岩飞; 潘志刚

doi:10.3724/SP.J.1146.2009.00733

基于DCT-TCQ的SAR原始数据压缩算法

doi: 10.3724/SP.J.1146.2009.00733

宋鸿梅^{①②;王岩飞,},
王岩飞,
潘志刚

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出版历程
- 收稿日期: 2009-05-12
- 修回日期: 2009-09-17
- 刊出日期: 2010-05-19

DCT-TCQ Based SAR Raw Data Compression Algorithm

Song Hong-mei^{①②;王岩飞
,},
Wang Yan-fei,
Pan Zhi-gang

摘要

摘要: 该文提出了一种基于离散余弦变换(DCT)和网格编码量化(TCQ)的SAR原始数据压缩算法。SAR原始数据可以看成是距离向和方位向的2维线性调频信号的线性平移叠加，因而含有丰富的频率分量，对DCT系数按频率分组，根据各组频率分量系数方差确定量化比特分配，然后对量化系数进行TCQ编码量化，可以大幅度提高了量化增益。真实SAR原始数据实验结果表明：该算法使SAR原始数据的压缩性能指标较现有算法有了明显提高。
- SAR原始数据压缩; 离散余弦变换; 比特分配; 网格编码量化
Abstract: In this paper, an algorithm for compressing SAR raw data is proposed. This algorithm is based on the combination of Discrete Cosine Transform(DCT) and Trellis Coding Quantization(TCQ). Because SAR raw data consists of mass linear frequency modulation signals and have plenty of frequency components, a quantization bit allocation method is desired with grouped DCT coefficients based on frequency components, and quantizing the coefficients with TCQ methods. therefore this algorithm obtains notable quantization gain. Simulation results on real SAR raw data show that the proposed algorithm outperforms existed algorithms.

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Sheng Lei, Zheng Tao-ye, and Zhang Xu-jin. Design and implementation of SAR raw data BAQ based on FPGA Synthetic Aperture Radar. APSAR 2007, 1st Asian and Pacific Conference on Huangshan, China, Nov. 5-9, 2007: 664-666.[2]Huneycutt B L. Spaceborne imaging Radar-C instrument [J].IEEE Transactions on Geoscience and Remote Sensing.1989, 27(2):164-169[3]Li Ting.[J].Wang Dong-jin, and Liu Fa-lin. A fast BAVQ algorithm for SAR raw data compression[C]. CIE 06. International Conference on Radar, on Shanghai, China, Oct. 16-1.2006,:-[4]潘志钢，王岩飞. 基于DCT的分块自适应量化算法及其用于SAR原始数据压缩[J].电子与信息学报.2007, 29(8):1784-1788浏览Pan Zhi-gang and Wang Yan-fei. A compression algorithm for SAR raw data based on the combination of discrete cosine transform and block-adaptive quantization[J].Journal of Electronics Information Technology.2007, 29(8):1784-1788[5]Zhou M, Deng Y, and Zhang Z. A new algorithm for SAR raw data compression by using wavelet packets. The 8th International Conference on Guilin, China, signal Processing, 2006, Vol.4: 16-20.[6]Bhattacharya S.[J].Blumensath T, Mulgrew B, and Davies M. Synthetic aperture radar raw data encoding using compressed sensing. Radar Conference, RADAR 08. IEEE on Guilin, China, May 26-3.2008,:-[7]潘志刚，低比特率合成孔径雷达数据压缩算法研究[D]. [博士论文]，中国科学院研究生院，2006.[8]Ungerboek G. Trellis-coded modulation with redundant signal sets - PartⅡ: State of the art[J].IEEE Communications Magazine.1987, 25(2):12-21[9]Forney G D Jr. The Viterbi algorithm. Proceedings of the IEEE, 1973, 25(2): 268-278.

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