基于压缩感知的ISAR像目标旁瓣抑制新方法  

A New Way of Suppressing ISAR Imaging Sidelobe Based on Compressed Sensing

作　　者：雷强[1] 李宏伟[1] 张群[1,2] 朱丰[1] 杨小优[1] 

机构地区：[1]空军工程大学电讯工程学院,西安710077 [2]复旦大学波散射与遥感信息国家教育部重点实验室,上海200433

出　　处：《弹箭与制导学报》2011年第1期143-146,150,共5页Journal of Projectiles,Rockets,Missiles and Guidance

基　　金：国家自然科学基金(60971100);陕西省自然科学基础研究项目(SJ08F10)资助

摘　　要：在ISAR成像中,基于脉冲压缩的处理方法不可避免地会产生目标旁瓣现象。为了有效的抑制目标旁瓣,提高目标识别能力,文中提出了一种基于压缩感知理论的ISAR成像方法,该方法根据雷达原始回波信号与参考信号作差频处理后所得信号的稀疏特性,构造合理的傅里叶基矩阵实现雷达数据的稀疏表征,然后利用正交匹配追踪算法重构目标谱图,并得到目标旁瓣被有效抑制的目标ISAR像。最后,通过仿真实验验证了文中方法的有效性和可行性。The technology of pulse compression, which always causes sidelobe, is widely used in radar system. In order to suppress target sidelobe availably and improve the imaging quality, a new method of ISAR imaging based on compressed sensing （CS） was proposed in this paper. In the method, we should firstly multiply the returned signal by conjugate of reference signal, construct a reasonable Fourier sparse basis matrix to realize the sparseness of radar data. Next, the spectrogram information was recovered by using the orthogonal matching pursuit algorithm（OMP）, and the ISAR image whose sidelobe was suppressed successfully was got. Finally, the results with simulation data validated the feasibility and superiority of the approach.

关 键 词：压缩感知 正交匹配追踪法 逆合成孔径雷达成像 旁瓣抑制 傅里叶基矩阵 

分 类 号：TN957.52[电子电信—信号与信息处理]