| 基于局域波分解的机动目标ISAR成像 |
| |
| 作者姓名： | 张义安 张冬晨 陈卫东 王东进 |
| |
| 作者单位： | 1. 中国电子科技集团第38研究所， 合肥 230061;
2. 中国科学技术大学电子工程与信息科学系， 合肥 230027 |
| |
| 摘 要： | 在飞机一类惰性较大的目标作机动飞行时,在ISAR成像的短时间内,同一距离单元的回波可近似看成多分量线性调频信号的叠加,且调频斜率各不相同. 因此,在ISAR成像的横向压缩处理中,先利用局域波分解方法将每个距离单元的回波分解为若干个线性调频信号,然后再进行Wigner-Ville变换(WVT),获取目标的瞬时多普勒谱,进而实现目标的二维成像. 该处理方法不仅避免了WVT交叉干扰项的产生,而且在保持WVT的高时频分辨能力的同时减少了计算量,仿真结果证明了该方法的有效性.
|
| 关 键 词： | 逆合成孔径雷达 线性调频信号 局域波分解 |
| 收稿时间： | 2008-06-18 |
| 修稿时间： | 2009-03-25 |
ISAR imaging of maneuvering target based on local wave decomposition |
| |
| Authors: | ZHANG Yi-An ZHANG Dong-Chen CHEN Wei-Dong WANG Dong-Jin |
| |
| Institution: | 1. No.38 Institute, China Electronics Technology Group Gorporation, Hefei 200061, China;
2. Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230027, China |
| |
| Abstract: | During the short time of the inverse synthetic aperture radar (ISAR) imaging, for inert maneuvering targets such as aircraft, the echoes of the same range cell can be considered to approximately consist of multi-component linear frequency modulated (LFM) signals with different chirp rate. For these cases, a method based on local wave decomposition and Wigner-Ville transformation is proposed, and thus 2-D imaging of the target is realized. It can not only avoid the cross-term of Wigner-Ville transformation but also decrease the computational load effectively for keeping high time-frequency resolution. Computer simulation results demonstrate the validity of the proposed algorithm. |
| |
| Keywords: | inverse synthetic aperture radar(ISAR) linear frequency modulated(LFM) signal local wave decomposition |
|
| 点击此处可从《》浏览原始摘要信息 |
| 点击此处可从《》下载免费的PDF全文 |
|
