| 基于稀疏线性调频步进信号的ISAR成像 |
| |
| 引用本文： | 王虹现,梁毅,邢孟道,张守宏.基于稀疏线性调频步进信号的ISAR成像[J].中国科学：信息科学,2011(12). |
| |
| 作者姓名： | 王虹现 梁毅 邢孟道 张守宏 |
| |
| 作者单位： | 西安电子科技大学雷达信号处理重点实验室; |
| |
| 基金项目： | 国家重点基础研究发展计划(批准号:2010CB731903)资助项目 |
| |
| 摘 要： | 线性调频步进信号在简化雷达系统设计的同时,也存在对高速运动目标易出现Doppler模糊的问题,因此研究如何提高其等效的重复频率具有重要意义.由于ISAR目标的后向散射场具有较强的稀疏性,即大部分能量仅由少数散射中心贡献,所以本文基于稀疏信号表示理论,通过对目标回波模型的分析,提出了一种基于稀疏步进频率信号的逆合成孔径雷达成像方法.该方法通过随机地选择线性调频步进信号的部分子脉冲进行发射,然后使用稀疏信号分解的方法对目标图像进行重建以得到目标的二维高分辨图像.该方法以计算资源为代价,能够有效地去除方位Doppler模糊,同时还能够压低旁瓣并得到超分辨的图像.仿真和实测数据处理结果验证了本文方法的有效性.
|
| 关 键 词： | 逆合成孔径雷达 雷达成像 稀疏信号表示 线性调频步进 |
ISAR imaging via sparse frequency-stepped chirp signal |
| |
| WANG HongXian,LIANG Yi,XING MengDao & ZHANG ShouHong National Key Laboratory of Radar Signal Processing,Xidian University,Xi'an ,China.ISAR imaging via sparse frequency-stepped chirp signal[J].Scientia Sinica Informationis,2011(12). |
| |
| Authors: | WANG HongXian LIANG Yi XING MengDao & ZHANG ShouHong National Key Laboratory of Radar Signal Processing Xidian University Xi'an China |
| |
| Affiliation: | WANG HongXian*,LIANG Yi,XING MengDao & ZHANG ShouHong National Key Laboratory of Radar Signal Processing,Xidian University,Xi'an 710071,China |
| |
| Abstract: | Frequency-stepped chirp signal can simplify the designation of radar system.However,it has a shortcoming of Doppler ambiguity for high-speed moving targets.Therefore,it is of great significance to study how to increase its equivalent pulse repeat frequency.The back scattering field of the ISAR target has strong sparsity;that is to say,most energy is contributed merely by a few scattering centers.Hence,based on the theory of the sparse signal representation,a novel method for ISAR imaging via sparse frequenc... |
| |
| Keywords: | inverse synthetic aperture radar(ISAR) radar imaging sparse signal representation frequencystepped(FS) |
| 本文献已被 CNKI 等数据库收录！ |
|
